Volume 8: Microturbines, Turbochargers, and Small Turbomachines; Steam Turbines最新文献_第3页

Numerical and Experimental Aerodynamic Investigation of a Low Pressure Steam Turbine Module 某低压汽轮机模块气动特性数值与实验研究

Volume 8: Microturbines, Turbochargers, and Small Turbomachines; Steam Turbines Pub Date : 2019-11-05 DOI: 10.1115/gt2019-91279

J. Bellucci, L. Peruzzi, A. Arnone, Lorenzo Arcangeli, N. Maceli

{"title":"Numerical and Experimental Aerodynamic Investigation of a Low Pressure Steam Turbine Module","authors":"J. Bellucci, L. Peruzzi, A. Arnone, Lorenzo Arcangeli, N. Maceli","doi":"10.1115/gt2019-91279","DOIUrl":"https://doi.org/10.1115/gt2019-91279","url":null,"abstract":"\u0000 This work aims to deepen the understanding of the aerodynamic behavior and the performance of a low pressure steam turbine module. Numerical and experimental results obtained on a three-stage low pressure steam turbine (LPT) module are presented. The selected geometry is representative of the state-of-the-art of low pressure sections for small steam turbines. The test vehicle was designed and operated in different operating conditions with dry and wet steam. Different types of measurements are performed for the global performance estimation of the whole turbine and for the detailed analysis of the flow field. Steady and unsteady CFD analyses have been performed by means of viscous, three-dimensional simulations adopting a real gas, equilibrium steam model. Measured inlet/outlet boundary conditions are used for the computations. The fidelity of the computational setup is proven by comparing computational and experimental results. Main performance curves and span-wise distributions show a good agreement in terms of both shape of curves/distributions and absolute values. Finally, an attempt is done to point out where losses are generated and the physical mechanisms involved are investigated and discussed in details.","PeriodicalId":105494,"journal":{"name":"Volume 8: Microturbines, Turbochargers, and Small Turbomachines; Steam Turbines","volume":"143 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122132343","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}

引用次数: 0

Numerical Investigation on the Vibration of Steam Turbine Main Inlet Control Valves Considering Fluid Force Effects 考虑流体力影响的汽轮机主进口控制阀振动数值研究

Volume 8: Microturbines, Turbochargers, and Small Turbomachines; Steam Turbines Pub Date : 2019-11-05 DOI: 10.1115/gt2019-90419

Li Yueyue, Sihua Xu, Jin He, Hu Zhiqiang, Lei Xiao

引用次数: 1

Experimental and Analytical Analysis of Aero-Derivative Micro Gas Turbine Heat Transfer and Performance 航空导数微型燃气轮机传热与性能的实验与分析

Volume 8: Microturbines, Turbochargers, and Small Turbomachines; Steam Turbines Pub Date : 2019-11-05 DOI: 10.1115/gt2019-90010

A. Grönman, P. Sallinen, J. Honkatukia, J. Backman, A. Uusitalo, J. Nerg, Ahti Jaatinen-Värri

{"title":"Experimental and Analytical Analysis of Aero-Derivative Micro Gas Turbine Heat Transfer and Performance","authors":"A. Grönman, P. Sallinen, J. Honkatukia, J. Backman, A. Uusitalo, J. Nerg, Ahti Jaatinen-Värri","doi":"10.1115/gt2019-90010","DOIUrl":"https://doi.org/10.1115/gt2019-90010","url":null,"abstract":"\u0000 Small-scale gas turbines offer a light weight alternative to engine generators. Despite the many benefits of a micro gas turbine, its efficiency cannot match that of its competitors. This discrepancy is mostly due to Reynolds number losses in turbomachinery but also partly due to internal heat transfer problems, which degrade the performance below what is adiabatically expected. In general, a good understanding about the heat transfer inside the machine is of paramount importance, and innovative engineering solutions are required to improve overall performance. Overall, one of the less exploited areas in the public literature is the effect of the generator cooling approach. Small jet engines can be used as a simple and affordable foundation to produce portable aero derivative micro gas turbines for demonstrating the specific challenges they face but also to study different flow configurations. This study presents combined analytical and experimental analysis of a portable aero derivative micro gas turbine with three main objectives. The first objective is to evaluate the contributions of different heat leakage losses on the overall performance. The second objective is to compare the influence of different generator cooling approaches. And the third objective is to evaluate the effect of different technical modifications. As a result, suggestions are given about the most suitable machine layouts and the importance of several design choices.","PeriodicalId":105494,"journal":{"name":"Volume 8: Microturbines, Turbochargers, and Small Turbomachines; Steam Turbines","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125327801","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}

引用次数: 0

Demonstration of a Dynamic Clearance Seal in a Rotating Steam Test Facility 动态间隙密封在旋转蒸汽试验装置中的演示

Volume 8: Microturbines, Turbochargers, and Small Turbomachines; Steam Turbines Pub Date : 2019-06-17 DOI: 10.1115/gt2019-91605

Andrew Messenger, Richard Williams, G. Ingram, S. Hogg, Philip Reggentin

{"title":"Demonstration of a Dynamic Clearance Seal in a Rotating Steam Test Facility","authors":"Andrew Messenger, Richard Williams, G. Ingram, S. Hogg, Philip Reggentin","doi":"10.1115/gt2019-91605","DOIUrl":"https://doi.org/10.1115/gt2019-91605","url":null,"abstract":"\u0000 This paper reports on the latest phase of the development of a new rotating machinery sealing technology, which was a successful seal test in a high temperature steam test facility at TU Brauschweig in Germany.\u0000 The “Aerostatic Seal” is a dynamic clearance seal that is capable of maintaining very small clearances with a rotor and has the potential for a wide range of rotating machinery applications. It has been developed in recent years at Durham University, UK, in collaboration with a major OEM, with a focus on steam turbine sealing, and has previously been reported on in a number of ASME Turbo Expo papers. Previous work has reported on the design tool, and two air test facilities; testing in steam addressed the effect of high temperature components and the working fluid, and was an opportunity to verify the design system.\u0000 The seal is a development of a retractable gland seal and so in a low load condition it is retracted from the rotor with a large rotor clearance and then when the pressure ratio is sufficient moves to an operational small clearance. At its operational clearance the seal is capable of moving with rotor vibrations which means the design clearance can be smaller than any expected rotor movement. The benefits include a significant reduction in leakage when compared to conventional sealing technologies and also the ability to react to large transients or thermal growths caused by rapid changes in machine loads and speeds. The seal is shown to operate well in this environment and this work moves the technology closer to deployment in industry.","PeriodicalId":105494,"journal":{"name":"Volume 8: Microturbines, Turbochargers, and Small Turbomachines; Steam Turbines","volume":"144 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116355676","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}

引用次数: 1

Optical Coarse Droplet Measurement and Wet Loss Analysis on the Wet Air Flow Through the Subsonic Blade Cascade Channel 亚音速叶片叶栅通道湿气流的光学粗滴测量及湿损失分析

Volume 8: Microturbines, Turbochargers, and Small Turbomachines; Steam Turbines Pub Date : 2019-06-17 DOI: 10.1115/gt2019-91928

Y. Sasao, Ryousuke Takata, Satoshi Miyake, S. Tabata, S. Yamamoto

引用次数: 0

Investigation of Cross-Sectional Velocity Field Near the Inducer Plane of a Turbocharger Compressor Using 2D Particle Image Velocimetry 利用二维粒子图像测速技术研究涡轮增压器压气机诱导面附近的截面速度场

Volume 8: Microturbines, Turbochargers, and Small Turbomachines; Steam Turbines Pub Date : 2019-06-17 DOI: 10.1115/gt2019-90384

D. Banerjee, R. Dehner, A. Selamet, Keith Miazgowicz, T. Brewer, Philip Keller, J. Shutty, A. Schwarz

{"title":"Investigation of Cross-Sectional Velocity Field Near the Inducer Plane of a Turbocharger Compressor Using 2D Particle Image Velocimetry","authors":"D. Banerjee, R. Dehner, A. Selamet, Keith Miazgowicz, T. Brewer, Philip Keller, J. Shutty, A. Schwarz","doi":"10.1115/gt2019-90384","DOIUrl":"https://doi.org/10.1115/gt2019-90384","url":null,"abstract":"\u0000 Understanding the velocity field at the inlet of an automotive turbocharger is critical in order to suppress the instabilities encountered by the compressor, extend its map and improve the impeller design. In the present study, two-dimensional particle image velocimetry experiments are carried out on a turbocharger compressor without any recirculating channel to investigate the planar flow structures on a cross-sectional plane right in front of the inducer at a rotational speed of 80 krpm. The objective of the study is to investigate the flow field in front of a compressor blade passage and quantify the velocity distributions along the blade span for different mass flow rates ranging from choke (77 g/s) to deep surge (13.6 g/s). It is observed that the flow field does not change substantially from choke to about 55 g/s, where flow reversal is known to start at this speed from earlier measurements. While the tangential velocity is less than 8 m/s, the radial velocity increases along the span to 17–20 m/s near the tip at high flow rates (55–77 g/s). As the mass flow rate is reduced below 55 g/s, the radial component starts decreasing and the tangential velocity increases rapidly. From about 5 m/s at 55 g/s, the tangential velocity at the blade tip exceeds 50 m/s at 50 g/s and reaches a maximum of about 135 m/s near surge. These time-averaged distributions are similar for different angular locations in front of the blade passage and do not exhibit any substantial azimuthal variation.","PeriodicalId":105494,"journal":{"name":"Volume 8: Microturbines, Turbochargers, and Small Turbomachines; Steam Turbines","volume":"93 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126369791","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}

引用次数: 1

Structural Optimization of Fir-Tree Root and Groove for Turbine Blade With Superellipse and P-Norm Aggregation Function 基于超椭圆和p范数聚集函数的涡轮叶片杉树根槽结构优化

Volume 8: Microturbines, Turbochargers, and Small Turbomachines; Steam Turbines Pub Date : 2019-06-17 DOI: 10.1115/gt2019-92005

Deqi Yu, Xiaojuan Zhang, Jiandao Yang, Cheng Kai, Ming Li

{"title":"Structural Optimization of Fir-Tree Root and Groove for Turbine Blade With Superellipse and P-Norm Aggregation Function","authors":"Deqi Yu, Xiaojuan Zhang, Jiandao Yang, Cheng Kai, Ming Li","doi":"10.1115/gt2019-92005","DOIUrl":"https://doi.org/10.1115/gt2019-92005","url":null,"abstract":"\u0000 Due to its finite size and the large centrifugal load, the fir-tree root is highly stressed, which leads to the possible early failure of the gas turbine and steam turbine. To find an optimized fir-tree root is an important issue for the design of the turbine structures. In this paper, a superellipse-based design optimization approach is proposed for the fir-tree root. Rather than the straight line and arc used in literature, the combination of the superellipse curve and line are employed to characterize the fir-tree root since the superellipse curve represents a large family of curves with limited parameters, which makes the design optimization easy and economic. For the design optimization, the objective function is to minimize the peak stress, which is a typical min-max problem with possible severe iterative oscillation and subsequent convergence difficulty. To avoid this problem, a P-norm aggregation function is proposed. The superellipse parameters are defined as design variables, while the stress concentration factor and the stress at root neck are specified as optimization constraints. With the P-series fir-tree root design as example, it is proved that our approach is effective to find the optimized configuration with better stress distribution and lower stress concentration.","PeriodicalId":105494,"journal":{"name":"Volume 8: Microturbines, Turbochargers, and Small Turbomachines; Steam Turbines","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123714915","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}

引用次数: 0

Towards Scale Resolving Computations of Condensing Wet Steam Flows 冷凝湿蒸汽流动的尺度解析计算

Volume 8: Microturbines, Turbochargers, and Small Turbomachines; Steam Turbines Pub Date : 2019-06-17 DOI: 10.1115/gt2019-91269

Pascal Post, Marwick Sembritzky, F. Mare

{"title":"Towards Scale Resolving Computations of Condensing Wet Steam Flows","authors":"Pascal Post, Marwick Sembritzky, F. Mare","doi":"10.1115/gt2019-91269","DOIUrl":"https://doi.org/10.1115/gt2019-91269","url":null,"abstract":"\u0000 In this paper we present a turbomachinery density-based CFD solver optimized for CPUs as well as GPUs, which accounts for complex thermodynamics including non-equilibrium condensation and two-phase flow, making extensive use of tabulation techniques. The two-phase flow is treated by means of the mono-dispersed Source-Term Euler-Euler model. The non-equilibrium wet-steam model is validated in classical nozzle test cases and its application in turbomachinery configuration is demonstrated in a well-documented steam turbine cascade in the context of classic RANS modeling. Finally, the LES-solver performance and scalability, together with its accuracy, are assessed and discussed on the basis of the well-known and theoretically relevant experiment by Comte-Bellot and Corrsin. For both, standard RANS computations, where an upwind schemes has been adopted, as well as for the LES computations, where a central scheme in skew-symmetric form has been employed, the solver shows remarkable computational speed and accuracy for non-ideal gas applications, rendering it suitable for more complex LES computations in steam turbine flows.","PeriodicalId":105494,"journal":{"name":"Volume 8: Microturbines, Turbochargers, and Small Turbomachines; Steam Turbines","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115023341","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}

引用次数: 7

Radial Inflow Turbine Geometry Generation Method Using Third Order Bezier Curves for Blade Design 叶片设计中基于三阶Bezier曲线的径向入流涡轮几何生成方法

Volume 8: Microturbines, Turbochargers, and Small Turbomachines; Steam Turbines Pub Date : 2019-06-17 DOI: 10.1115/gt2019-90163

U. Caldiño-Herrera, Juan Garcia, F. Sierra-Espinosa, J. O. Dávalos, M. A. Lira

{"title":"Radial Inflow Turbine Geometry Generation Method Using Third Order Bezier Curves for Blade Design","authors":"U. Caldiño-Herrera, Juan Garcia, F. Sierra-Espinosa, J. O. Dávalos, M. A. Lira","doi":"10.1115/gt2019-90163","DOIUrl":"https://doi.org/10.1115/gt2019-90163","url":null,"abstract":"\u0000 Radial inflow turbines offer larger efficiency performance for small power applications due to its geometric configuration in which flow varies its radial position along the flow path.\u0000 The geometry configuration of radial-inflow turbines demands a careful and adequate design of the flow path, since a 90° change of direction occurs from the radial inflow to the axial outflow. The blade camberline also requires attention since it defines the tangential flow direction along the meridional coordinate and any variation in its geometry affects the turbine performance.\u0000 In this paper, a method for meridional profile and camberline geometry generation is proposed and tested through CFD. The method consists in using fourth order Bezier curves for defining the hub, shroud and mid-height blade meridional profile and third order Bezier curves for defining the relative flow velocity angle along the meridional coordinate, which leads to the camberline angular position in the rotor considering radial fibered blades. The blade thickness is set to vary linearly along the meridional coordinate and along the blade height. Different configurations of blade geometry are proposed and analyzed. These configurations are fixed to satisfy the design parameters.\u0000 The code is programed in Python and adjusts the geometry data in files that are readable by meshing software. Thereby numerical calculations are performed to verify which configuration of camberline results in better performance. The calculations are done in models with the same boundary conditions and geometric data except for the variation of relative flow velocity angle along the meridional coordinate but setting the inlet and outlet angle to a fixed value. This way, the most suitable camberline geometry can be selected. The CDF model used for this analysis was validated with the experimental results reported by Kang et al. [1]","PeriodicalId":105494,"journal":{"name":"Volume 8: Microturbines, Turbochargers, and Small Turbomachines; Steam Turbines","volume":"108 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123678570","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}

引用次数: 3

Parametric Study on Ported Shroud Locations and Geometries for a Turbocharger Compressor 涡轮增压器压气机入口叶冠位置及几何参数化研究

Volume 8: Microturbines, Turbochargers, and Small Turbomachines; Steam Turbines Pub Date : 2019-06-17 DOI: 10.1115/gt2019-91245

Suheab Thamizullah, A. Nassar, A. Davis, G. Giri, L. Moroz

{"title":"Parametric Study on Ported Shroud Locations and Geometries for a Turbocharger Compressor","authors":"Suheab Thamizullah, A. Nassar, A. Davis, G. Giri, L. Moroz","doi":"10.1115/gt2019-91245","DOIUrl":"https://doi.org/10.1115/gt2019-91245","url":null,"abstract":"\u0000 Turbochargers are commonly used in automotive engines to increase the internal combustion engine performance during off-design operating conditions. When used, the widest operating range for the turbocharger is desired, which is limited on the compressor side by the choke condition and the surge phenomenon. The ported shroud technology is used to extend the operable working range of the compressor, by permitting flow disturbances that block the blade passage to escape and stream back through the shroud cavity to the compressor inlet. The impact of this technology, on a speed-line, at near optimal operating condition, near choke operating condition and near surge operating condition is investigated.\u0000 The ported shroud (PS) self-recirculating casing treatment is widely used to delay the onset of surge by enhancing the aerodynamic stability of the turbocharger compressor. While the ported shroud design delays surge, it usually comes with a small penalty in efficiency.\u0000 This research involves designing a single-stage centrifugal compressor for the given specifications, considering the application of an automotive turbocharger. The ported shroud was then introduced in the centrifugal compressor. The performance characteristics were obtained, both at the design and at off-design conditions, both with and without the ported shroud. The performance was compared at various off-design operating speed lines. The entire study, from designing the compressor to optimizing the ported shroud configuration, was performed using the commercial AxSTREAM® software platform. Parametric studies were performed to study the effect of ported shroud axial location along the blade axial length on the operating range and performance. The baseline design, without the ported shroud (P0), and the final geometry with it for all PS inlet axial locations (P1 to P5) were analysed using a commercial CFD package and the results were compared with those from the streamline solver.","PeriodicalId":105494,"journal":{"name":"Volume 8: Microturbines, Turbochargers, and Small Turbomachines; Steam Turbines","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124927219","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}

引用次数: 0