Volume 7: Industrial and Cogeneration; Manufacturing Materials and Metallurgy; Microturbines, Turbochargers, and Small Turbomachines; Oil & Gas Applications最新文献

{"title":"Experimental Investigation of Twin Scroll Turbocharger Performance Under Pulsating Conditions","authors":"Philipp Brodbeck, Eduard Guse","doi":"10.1115/gt2022-80150","DOIUrl":"https://doi.org/10.1115/gt2022-80150","url":null,"abstract":"The pulsating nature of automotive internal combustion engines (ICE) is one of the main challenges in the modeling of turbochargers in process simulation. Radial compressors and turbines are characterized by maps containing parameters such as wheel speed, mass flow rate, temperatures and pressure ratios. Those parameters are obtained by standardized test bench measurements, which require stationary flow conditions. In this paper an advanced experimental setup is introduced to investigate the turbine behavior under pulsating conditions. Pressure, temperature, mass flow and turbine torque are measured with an equivalent to a resolution of 0.1 degrees camshaft rotation to obtain working cycle resolved parameters. This way, the turbine performance can be evaluated under pulsating conditions.","PeriodicalId":301910,"journal":{"name":"Volume 7: Industrial and Cogeneration; Manufacturing Materials and Metallurgy; Microturbines, Turbochargers, and Small Turbomachines; Oil & Gas Applications","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130289100","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Sintering Behaviour of 3d Printed 17-4PH Stainless Steel","authors":"N. Raju, P. Warren, R. Subramanian, Hossein Ebrahimi, E. Fernandez, S. Raghavan, J. Kapat","doi":"10.1115/gt2022-83592","DOIUrl":"https://doi.org/10.1115/gt2022-83592","url":null,"abstract":"\u0000 The main aim of the research work is to investigate the sintering behavior and its impact on the material properties of 3D printed 17-4PH stainless steel. The samples were manufactured by the Atomic Diffusion Additive Manufacturing technique, the Metal X system. Cooling holes were printed with the sample in different build orientations giving an overview of the printability and accuracy of the atomic diffusion additive manufacturing (ADAM) technique. Samples were processed by washing, thermal de-binding, and sintering to produce a final solid metal part. Pre-sintered parts, after washing, were tested for chemical composition, roughness, particle size analysis, density, Energy Dispersive X-ray spectroscopy, and microstructure analysis using Scanning electron microscopy (SEM) to understand the material properties. Post-sintered samples were tested for the same tests to understand the sintering impact. A unique conceptual approach and statistical analysis are included in this research. To understand the thermal de-binding and sintering kinetics Differential Scanning Calorimetry (DSC) and Dilatometry (DIL) tests were performed. DSC results gave details about the thermal de-binding and binder information. Dilatometry (DIL) results showed shrinkage over the temperature profile, and significant changes in shrinkages were found above 1250 °C. The results gave an overview of the sintering kinetics and sintering impact of 3D printed 17-4PH stainless steel. This helps decide the optimized thermal debinding and sintering profile to achieve high dense material. It should be noted that this is the first-ever study investigating in detail thermal de-binding and sintering kinetics and its impact on the material properties according to the ADAM technique.","PeriodicalId":301910,"journal":{"name":"Volume 7: Industrial and Cogeneration; Manufacturing Materials and Metallurgy; Microturbines, Turbochargers, and Small Turbomachines; Oil & Gas Applications","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122686794","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analysis of Combustion Performance of Non-Conventional Syngas in mGT Combustor: Assessment of the Impact of the Quality of Synthesis Gas Towards Flame Stability and Emissions","authors":"J. Bompas, Alessio Pappa, W. De Paepe","doi":"10.1115/gt2022-82888","DOIUrl":"https://doi.org/10.1115/gt2022-82888","url":null,"abstract":"\u0000 The current limited availability of conventional fossil fuels, e.g., natural gas, as a result of the active demand in the industrial revival, leading to increasing prices as well as uncertainty and tension on the international market, strengthens the interest on energy source diversification to ensure sufficient sustainable resources for both heat and electricity demand. Non-conventional renewable resources like biogas, syngas, and biofuels are good candidates to achieve these energy mix goals, especially in a decentralized power production context, e.g., when used in micro Gas Turbines (mGTs) in small-scale cogeneration applications. Moreover, they also present the benefit of reducing CO2 emission and, while doing so, helping to move towards global zero emission by 2050. However, given their specific properties, i.e., a lower energy content, a lower overall conversion efficiency, different and altering composition, as well as an important steam fraction when not properly post-treated, a better characterize of these non-conventional energy sources in their combustion behavior is needed.\u0000 The aim of our work is thus to identify the combustion behaviour of several characteristic syngases in a typical industrial combustor, the Turbec T100 combustion chamber, designed for operation using natural gas. The performance of the combustor has been analysed using CFD calculations, under different syngas composition with increasing remaining steam fraction, aiming to determine the maximal allowable rest steam fraction, in an attempt to limit syngas post-treatment after production towards enhanced global cycle performance. In particular, the ignition and stability of the flame has been studied under a syngas pilot flame. To study this, velocity and temperature fields are analysed, as well as the specific flue gas composition. While the simulation results using dry syngas show temperature distributions and emission prediction in line with previous observation, the steam dilution effect leads to a clear shift in both temperature and emissions. More specifically, it is found that especially NOx emissions are sensible towards changes in pilot and main flame fuel distribution alterations. These obtained results will serve as benchmark for future characterization for a specific range of diluted inlet conditions of raw syngases, as well as specific studies on the impact of pilot/main flame fuel distribution towards flame stability and emissions control, which will allow to fully exploit their potential in small-scale cogeneration application.","PeriodicalId":301910,"journal":{"name":"Volume 7: Industrial and Cogeneration; Manufacturing Materials and Metallurgy; Microturbines, Turbochargers, and Small Turbomachines; Oil & Gas Applications","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114121869","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Microstructural Evolution of Wrought and AM Haynes 188 Under Long Term Thermal Exposure","authors":"Vamadevan Gowreesan, W. Greaves, Y. Pardhi, K. Barrios","doi":"10.1115/gt2022-79113","DOIUrl":"https://doi.org/10.1115/gt2022-79113","url":null,"abstract":"\u0000 Haynes 188 is a cobalt-based superalloy used in hot section gas turbine components due to its excellent oxidation resistance and elevated temperature stability. Parts made from Haynes 188 are traditionally manufactured from wrought or forged material. Additive manufacturing (AM) may be a less time consuming and more cost-effective alternative, particularly for replacement parts. Additionally, necessary design changes can be quickly introduced into service using additive manufacturing. It is important to understand the effect of long-term thermal exposure on additively manufactured parts before they are put into demanding high temperature applications. Data on the effect of long-term thermal exposure on wrought Haynes 188 is readily available in the open literature. However, such data for additively manufactured Haynes 188 is scarce.\u0000 This paper discusses an experimental study that investigated the microstructural evolution in wrought and AM Haynes 188 under long-term thermal exposure. Optical metallography and scanning electron microscopy (SEM) were performed on wrought and AM Haynes 188 in the virgin and long-term thermally exposed conditions. Mechanical test samples from the coupons were then extracted and tested in both conditions. Lastly, the fracture surfaces of the mechanical test specimens were evaluated by SEM fractography and metallography of sections through the fracture surfaces. The findings help to understand how long-term thermal exposure affects the microstructure and mechanical properties of wrought and AM Haynes 188. Most importantly, it illustrates a significant difference in microstructural response of the two materials to long term thermal exposure and its effect on mechanical properties.","PeriodicalId":301910,"journal":{"name":"Volume 7: Industrial and Cogeneration; Manufacturing Materials and Metallurgy; Microturbines, Turbochargers, and Small Turbomachines; Oil & Gas Applications","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114252791","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"An Euler-Based Throughflow Approach for Centrifugal Compressors – Part B: Experimental Investigations and Validation","authors":"T. Doerr, Atti̇lla Yildiz, B. Dolle, D. Brillert","doi":"10.1115/gt2022-82114","DOIUrl":"https://doi.org/10.1115/gt2022-82114","url":null,"abstract":"\u0000 For turbomachinery design, manufacturers today need fast tools to predict the performance of an aerodynamic design with good accuracy. However, CFD tools are often cumbersome in terms of computation time and licensing costs for commercial solvers.\u0000 In this context, a quasi-three-dimensional solver, called tFlow, for centrifugal compressors is presented in Part A of this paper. To validate and calibrate the model, an experimental test rig is developed and presented in this paper. The setup consists of a single-stage centrifugal compressor with a shrouded impeller providing a pressure ratio up to 1.85. On the pressure side, the diffuser is followed by a volute and a throttle to capture the whole speed characteristic between surge and choke. Thermodynamic data, such as pressure and temperature upstream and downstream of the compressor, are recorded as well as torque and rotational speed at the shaft coupling. In addition, the test rig can also be used to investigate the effects of wet compression. For this purpose, a spray nozzle can be installed in front of the impeller’s bell mouth. In order to investigate the influence of temperatures on evaporation rates, a preheater in front of the compressor section is installed to heat the air up to temperatures of 80 °C.\u0000 In this paper, dry results are shown for inlet temperatures of 22, 30, 40 and 50 °C. To compare the characteristics at different preheated conditions, reduced rotational speed and air mass flow rate are kept constant. These resulting performance maps are in good agreement between each case. The numerical results of Part A are validated by the experimental data herein.","PeriodicalId":301910,"journal":{"name":"Volume 7: Industrial and Cogeneration; Manufacturing Materials and Metallurgy; Microturbines, Turbochargers, and Small Turbomachines; Oil & Gas Applications","volume":"515 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116217288","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Physical Insight Into Whoosh Noise in Turbocharger Compressors Using Computational Fluid Dynamics","authors":"R. Dehner, A. Selamet, P. Sriganesh, D. Banerjee, E. Selamet, Ahsanul Karim, T. Brewer, Anthony Morelli","doi":"10.1115/gt2022-78205","DOIUrl":"https://doi.org/10.1115/gt2022-78205","url":null,"abstract":"\u0000 Whoosh is typically the primary noise concern for turbocharger centrifugal compressors without ported shroud recirculating casing treatments, utilized for spark-ignition automotive applications. Whoosh is characterized by broadband elevation of noise in approximately the 4 to 13 kHz range, where the lower frequency boundary is dictated by the cut-on frequency of the first multi-dimensional acoustic mode. At mid to low compressor flow rates, swirling, reversed flow emanates from the leading-edge tip region of the main impeller blades, comprising an annular zone at the inducer plane. High velocity gradients are observed within the shear layer between the bi-directional forward and reverse flow which results in the formation of rotating instability (RI) cells. Whoosh noise is generated due to the interaction of these rotating instabilities with the leading edge of main impeller blades. Along a line of constant rotational speed, whoosh noise exhibits a dome-like character, where its maximum value occurs in the mid to low flow region and the whoosh noise levels decrease at elevated and reduced mass flow rates. The present work includes experimentally validated three-dimensional computational fluid dynamics predictions for five mass flow rates at a fixed rotational speed. These predictions span the constant speed flow range from just below the peak efficiency to near the surge boundary. A modal decomposition is performed on the predicted pressures from a circular array of points near the inducer plane to characterize the modal content of the RI cells at each of the studied flow rates. At the highest flow rate studied (near peak efficiency), flow reversal is present only intermittently near the inducer plane, resulting in weak RI cells and therefore, low levels of whoosh noise. As the flow rate is reduced, sustained flow reversal is present within the annular region near the inducer blade tips, which strengthens the RI cells. For the three lowest flow rates considered, the strength of the RI cells is somewhat similar, but they are characterized by lower mode numbers and frequencies as the flow rate is reduced. This shift is physically interpreted as a reduction in the number of RI cells when moving from peak whoosh noise in the mid to low flow range to lower flow rates approaching the surge line. Due to the shift in mode number and frequency of the RI cells, the modal content of the resulting impeller and RI interaction noise shifts to higher mode numbers and frequencies as the flow rate is reduced. At the peak whoosh noise, the interaction modes occur at frequencies above their cut-off, and thereby propagate upstream through the inlet duct. At the two lowest flow rates, on the other hand, the modal content of the interaction noise increasingly shifts to higher mode numbers and frequencies where they are cut-off. Thus, the computational predictions capture the physical mechanism responsible for the dome-like character of whoosh noise as a function of ","PeriodicalId":301910,"journal":{"name":"Volume 7: Industrial and Cogeneration; Manufacturing Materials and Metallurgy; Microturbines, Turbochargers, and Small Turbomachines; Oil & Gas Applications","volume":"98 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123200940","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Economizer Location Optimization for a Centrifugal Compressor With Refrigerant as Working Fluid","authors":"Jose Urcia, Jin Yan, Tadeu Fagundes","doi":"10.1115/gt2022-79574","DOIUrl":"https://doi.org/10.1115/gt2022-79574","url":null,"abstract":"\u0000 In a typical HVAC chiller, centrifugal compressors are used to compress the refrigerant. These compressors are of single or multi-stage cycles that can be configured for a reinjection between cycles. This reinjection introduces cascade cycle options while improving the Coefficient of Performance (COP). One cascade cycle option that has become industry standard is an economizer cycle. During this process, the goal becomes to reinject flow back into the compressor between stages while the remaining flow continues through the cycle. The exact location of the economizer where its benefit would be at a maximum has yet to be determined. This paper develops a high-fidelity full compressor model where an economizer may be simply added into any location. A thermodynamic cycle analysis is used to highlight the locations where an economizer may be most beneficial thus limiting the number of locations to investigate. Initially, three different full compressor models are developed with increased model complexity for model validation. The most complex agreed with experimental results with high-accuracy and was used for further economizer testing. The most complex compressor model is investigated under 100% the design speed without the added economizer where a baseline is achieved. The thermodynamic cycle analysis is then implemented to identify the optimal economizer location based on the interstage pressure. Four locations are determined to fit the criteria. Two economizer locations were found to exhibit improved performance when compared to the remaining locations, increasing the aerodynamic efficiency of the base model by 10%.","PeriodicalId":301910,"journal":{"name":"Volume 7: Industrial and Cogeneration; Manufacturing Materials and Metallurgy; Microturbines, Turbochargers, and Small Turbomachines; Oil & Gas Applications","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131677062","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Advanced Thermal Profiling of Turbocharger Compressor Wheels Using Phosphorescence Thermal History Coatings","authors":"S. Karagiannopoulos, Martin Rode, D. Peral, Daniel Castillo, Silvia Araguás-Rodríguez, Kieron Rai, Ryosuke Inomata, Georgios Iosifidis, J. Feist","doi":"10.1115/gt2022-80820","DOIUrl":"https://doi.org/10.1115/gt2022-80820","url":null,"abstract":"\u0000 Compliance towards future emissions legislation requires internal combustion engines (ICE) to utilize highly efficient combustion concepts (e.g. Miller cycle), which, are often associated with increased boost pressure requirements, leading to increased mechanical stress on turbocharger components. This is especially the case for compressor wheels due to the increased speed and temperature loading. To offer cost competitive products, IHI seeks to further exploit the limits of conventional state-of-the-art materials used in automotive turbochargers and refine their component development processes. While knowledge of the exact boundary conditions under which turbocharger components are operating is essential, the actual material temperature components experience under real operating conditions is a significant source of uncertainty.\u0000 Temperature measurements are usually conducted during turbomachinery durability tests to validate thermodynamic models and assess component lifetime. Temperature measurement techniques typically include thermocouples, optical sensors and thermal paints. However, the former methods are limited mostly to stationary components and can only provide point measurements, while the latter only offers low resolution data for short durations and involves highly toxic materials. Thermal History Paint & Coating technology developed by Sensor Coating Systems (SCS) offers a unique solution for thermal mapping in harsh environments. The technology is based on a phosphor material which is applied as a paint or coating on the surface of the components to be measured. The luminescent properties of the coating material are permanently changing depending on the maximum exposure temperature during the test. The THP/C luminescent properties are measured in multiple locations using a laser-based instrumentation system and a robotic arm. High-resolution thermal maps directly on the 3D CAD models of the component are generated.\u0000 For this application, the THP material has been applied for the first time on the surface of three turbocharger compressor wheels tested under different cooling conditions. The THP material exhibited excellent durability during testing at high circumferential speeds above 580 m/s. More than 2,000 temperature measurements were obtained on pre-selected locations on the surface of the wheels. The test demonstrates that THP can be used on components with complex geometries such as turbocharger compressor wheels. Additionally, temperatures as low as 120 °C have been resolved for the first time.","PeriodicalId":301910,"journal":{"name":"Volume 7: Industrial and Cogeneration; Manufacturing Materials and Metallurgy; Microturbines, Turbochargers, and Small Turbomachines; Oil & Gas Applications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130173134","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hexavalent Chromium Observations on Serviced Components of Oil&Gas Gas Turbines: Formation Mechanism Study","authors":"E. Scrinzi, G. Mochi, Antonio Melani, Eugenio Del Puglia, A. Pranzetti","doi":"10.1115/gt2022-80448","DOIUrl":"https://doi.org/10.1115/gt2022-80448","url":null,"abstract":"\u0000 Hexavalent chromium Cr(VI) is one of the oxidation states (+6) of chromium. It is a recognized toxin and carcinogen, which if ingested or inhaled may affect the respiratory system, kidneys, and liver. It can also cause dermatitis and severe irritation to the eyes. It is widely present in electroplating, anodizing and dye production industries, but has recently been identified as contaminant on serviced components of gas turbines. To this regard, there is the potential for Cr(VI) compounds to be present on gas turbine components serviced at high temperature, if calcium-containing insulating, anti-seize or sealing products are used.\u0000 A systematic experimental campaign was carried out to investigate the mechanism and understand the influence of various factors on the formation of substances containing chromium in the hexavalent form. During the test campaign, anti-seize products, sealing products, insulating products but also environmental contaminants were tested on different bare materials in different service conditions.","PeriodicalId":301910,"journal":{"name":"Volume 7: Industrial and Cogeneration; Manufacturing Materials and Metallurgy; Microturbines, Turbochargers, and Small Turbomachines; Oil & Gas Applications","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127961800","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Multidisciplinary Optimization of Radial Outflow Turbines With Highly Deformable Blades","authors":"André Governo, B. Saracoglu","doi":"10.1115/gt2022-84333","DOIUrl":"https://doi.org/10.1115/gt2022-84333","url":null,"abstract":"\u0000 Miniature radial outflow turbines are used to generate onboard power for various aerial devices using the ram effect. The incoming air flow axially entering the inlet conduit of the turbine housing spins the turbine rotor, which may have excessive tip gap and a sizable hub cavity, and radially discharges from the turbine flow passages. The current class of turbine rotors under investigation are typically made of polymeric materials for serial production at reduced cost. The turbine airfoils are designed with significant overhanging sections over the large hub cavity. Such configuration allows regulating the rotational speed of the rotor, at high inlet velocity conditions, by enabling the rear part of the blades to bend under the effect of centrifugal and fluidic forces. However, such deflections may lead to material non-linearities and strongly affect the flow development through the blade passages, which are not yet documented in the open literature. This paper investigates the complex flow field inside such turbines for a wide range of operating conditions. A multidisciplinary design optimization routine was utilized to assess the conflicting influence of the aerodynamical and structural performance for this class of turbines. The strategy utilizes an in-house metamodel-assisted optimizer (CADO) based on artificial neural networks and genetic algorithms to maximize the power output while evaluating the impact of the rotational speed on blade displacement and flow behaviour. A decoupled fluid-structure interaction approach was established in the computational fluid dynamics solver integrated with the optimizer. The methodology validation was achieved through the experimental results on high-speed blade deformation of the initial turbine mockup. The results show striking changes to turbine geometry mainly dictated by the centrifugal force as compared to the fluidic loads play when a hub cavity exists. A change in the blade loading is identified due to the three-dimensional geometric modifications of the rotor under load solicitations and connected with a modification of the incidence angle and profile curvatures. Such a process decreases the turbine’s efficiency, especially at very high rotational speeds. The results of this work provide a comprehensive design space and guidelines on the development of radial outflow turbines through the extensive optimization study for preliminary design choices for turbines with similar geometries.","PeriodicalId":301910,"journal":{"name":"Volume 7: Industrial and Cogeneration; Manufacturing Materials and Metallurgy; Microturbines, Turbochargers, and Small Turbomachines; Oil & Gas Applications","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129545841","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}