International Journal of Turbomachinery, Propulsion and Power最新文献_第9页

Flow in Pillow-Plate Channels for High-Speed Turbomachinery Heat Exchangers 高速涡轮机械换热器枕板通道中的流动

IF 1.4

International Journal of Turbomachinery, Propulsion and Power Pub Date : 2022-03-22 DOI: 10.3390/ijtpp7020012

S. Sundermeier, Maximilian Passmann, S. aus der Wiesche, E. Kenig

{"title":"Flow in Pillow-Plate Channels for High-Speed Turbomachinery Heat Exchangers","authors":"S. Sundermeier, Maximilian Passmann, S. aus der Wiesche, E. Kenig","doi":"10.3390/ijtpp7020012","DOIUrl":"https://doi.org/10.3390/ijtpp7020012","url":null,"abstract":"In numerous turbomachinery applications, e.g., in aero-engines with regenerators for improving specific fuel consumption (SFC), heat exchangers with low-pressure loss are required. Pil low-plate heat exchangers (PPHE) are a novel exchanger type and promising candidates for high-speed flow applications due to their smooth profiles avoiding blunt obstacles in the flow path. This work deals with the overall system behavior and gas dynamics of pillow-plate channels. A pillow-plate channel was placed in the test section of a blow-down wind tunnel working with dry air, and compressible flow phenomena were investigated utilizing conventional and focusing schlieren optics; furthermore, static and total pressure measurements were performed. The experiments supported the assumption that the system behavior can be described through a Fanno–Rayleigh flow model. Since only wavy walls with smooth profiles were involved, linearized gas dynamics was able to cover important flow features within the channel. The effects of the wavy wall structures on pressure drop and Mach number distribution within the flow path were investigated, and a good qualitative agreement with theoretical and numerical predictions was found. The present analysis demonstrates that pressure losses in pillow-plate heat exchangers are rather low, although their strong turbulent mixing enables high convective heat transfer coefficients.","PeriodicalId":36626,"journal":{"name":"International Journal of Turbomachinery, Propulsion and Power","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2022-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43588016","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: 2

The Profile Loss of Additive Manufactured Blades for Organic Rankine Cycle Turbines 有机朗肯循环涡轮机添加剂制造叶片的型面损失

IF 1.4

International Journal of Turbomachinery, Propulsion and Power Pub Date : 2022-03-21 DOI: 10.3390/ijtpp7010011

L. Hake, Felix Reinker, R. Wagner, S. aus der Wiesche, M. Schatz

引用次数: 3

Stall Margin Improvement in an Axial Compressor by Continuous and Pulsed Tip Injection 连续和脉冲叶尖喷射改善轴流压气机失速余量

IF 1.4

International Journal of Turbomachinery, Propulsion and Power Pub Date : 2022-03-16 DOI: 10.3390/ijtpp7010010

Joseph Moubogha Moubogha, G. Margalida, P. Joseph, O. Roussette, A. Dazin

{"title":"Stall Margin Improvement in an Axial Compressor by Continuous and Pulsed Tip Injection","authors":"Joseph Moubogha Moubogha, G. Margalida, P. Joseph, O. Roussette, A. Dazin","doi":"10.3390/ijtpp7010010","DOIUrl":"https://doi.org/10.3390/ijtpp7010010","url":null,"abstract":"Stall and surge are strong limitations in the operating range of compressors and thus one of the major limits of jet engine performance. A promising way to push the stability limit of compression machines is to inject a small amount of flow at the blade tip to alter the physical mechanism responsible for stall onset. This study focuses on the experimental performance of such a system. To do so, an axial compressor test bench was equipped with 40 actuators connected to an auxiliary pressurised air supply system. They were able to generate high-speed jet blowing just at the tip of the rotor blades. The opening of each actuator was controlled by an electromagnetic valve. This allowed generating continuous or pulsed jets with frequencies up to 500 Hz at different duty cycles. The performance of the control system was investigated for various control strategies, where the injected flow rate, the injection angle, the number of injectors, the jet frequency and the duty cycle were systematically varied. This paper is concluded by a study of the energy balance of the system for various configurations. To the best of the authors’ knowledge, this constitutes a rarely seen analysis in the literature.","PeriodicalId":36626,"journal":{"name":"International Journal of Turbomachinery, Propulsion and Power","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2022-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46277008","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: 5

Experimental Validation of an Analytical Condensation Model for Application in Steam Turbine Design 用于汽轮机设计的分析冷凝模型的实验验证

IF 1.4

International Journal of Turbomachinery, Propulsion and Power Pub Date : 2022-03-03 DOI: 10.3390/ijtpp7010009

F. Lapp, S. Schuster, S. Hecker, D. Brillert

引用次数: 0

Reynolds Sensitivity of the Wake Passing Effect on a LPT Cascade Using Spectral/hp Element Methods 用谱/马力元方法研究LPT级联的尾迹传递效应的雷诺灵敏度

IF 1.4

International Journal of Turbomachinery, Propulsion and Power Pub Date : 2022-02-22 DOI: 10.3390/ijtpp7010008

Andrea Cassinelli, Andrés Mateo Gabín, F. Montomoli, P. Adami, Raul Vázquez Díaz, S. Sherwin

{"title":"Reynolds Sensitivity of the Wake Passing Effect on a LPT Cascade Using Spectral/hp Element Methods","authors":"Andrea Cassinelli, Andrés Mateo Gabín, F. Montomoli, P. Adami, Raul Vázquez Díaz, S. Sherwin","doi":"10.3390/ijtpp7010008","DOIUrl":"https://doi.org/10.3390/ijtpp7010008","url":null,"abstract":"Reynolds-Averaged Navier–Stokes (RANS) methods continue to be the backbone of CFD-based design; however, the recent development of high-order unstructured solvers and meshing algorithms, combined with the lowering cost of HPC infrastructures, has the potential to allow for the introduction of high-fidelity simulations in the design loop, taking the role of a virtual wind tunnel. Extensive validation and verification is required over a broad design space. This is challenging for a number of reasons, including the range of operating conditions, the complexity of industrial geometries and their relative motion. A representative industrial low pressure turbine (LPT) cascade subject to wake passing interactions is analysed, adopting the incompressible Navier–Stokes solver implemented in the spectral/hp element framework Nektar++. The bar passing effect is modelled by leveraging a spectral-element/Fourier Smoothed Profile Method. The Reynolds sensitivity is analysed, focusing in detail on the dynamics of the separation bubble on the suction surface as well as the mean flow properties, wake profiles and loss estimations. The main findings are compared with experimental data, showing agreement in the prediction of wake traverses and losses across the entire range of flow regimes, the latter within 5% of the experimental measurements.","PeriodicalId":36626,"journal":{"name":"International Journal of Turbomachinery, Propulsion and Power","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2022-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47800587","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

Aeroelastic Stability of Combined Plunge-Pitch Mode Shapes in a Linear Compressor Cascade 线性压缩机叶栅中组合柱塞-节距模态形状的气动弹性稳定性

IF 1.4

International Journal of Turbomachinery, Propulsion and Power Pub Date : 2022-02-14 DOI: 10.3390/ijtpp7010007

George Hill, Julian Gambel, Sabine Schneider, D. Peitsch, Sina Stapelfeldt

{"title":"Aeroelastic Stability of Combined Plunge-Pitch Mode Shapes in a Linear Compressor Cascade","authors":"George Hill, Julian Gambel, Sabine Schneider, D. Peitsch, Sina Stapelfeldt","doi":"10.3390/ijtpp7010007","DOIUrl":"https://doi.org/10.3390/ijtpp7010007","url":null,"abstract":"Modern aeroengine designs strive for peak specific fuel and thermal efficiency. To achieve these goals, engines have more highly loaded compressor stages, thinner aerofoils, and blended titanium integrated disks (blisks) to reduce weight. These configurations promote the occurrence of aeroelastic phenomena such as flutter. Two important parameters known to influence flutter stability are the reduced frequency and the ratio of plunge and pitch components in a combined flap mode shape. These are used as design criteria in the engine development process. However, the limit of these criteria is not fully understood. The following research aims to bridge the gap between semi-analytical models and modern compressors by systematically investigating the flutter stability of a linear compressor cascade. This paper introduces the plunge-to-pitch incidence ratio, which is defined as a function of reduced frequency and pitch axis setback for a first flap (1F) mode shape. Using numerical simulations, in addition to experimental validation, aerodynamic damping is computed for many modes to build stability maps. The results confirm the importance of these two parameters in compressor aeroelastic stability as well as demonstrate the significance of the plunge-to-pitch incidence ratio for predicting the flutter limit.","PeriodicalId":36626,"journal":{"name":"International Journal of Turbomachinery, Propulsion and Power","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2022-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43329104","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: 2

Trapped Acoustic Modes in an Axial Multi-Stage Compressor Leading to Non-Synchronous Blade Vibrations 轴向多级压气机叶片非同步振动的俘获声模

IF 1.4

International Journal of Turbomachinery, Propulsion and Power Pub Date : 2022-02-04 DOI: 10.3390/ijtpp7010006

Anne-Lise Fiquet, S. Aubert, N. Buffaz, A. Vercoutter, C. Brandstetter

{"title":"Trapped Acoustic Modes in an Axial Multi-Stage Compressor Leading to Non-Synchronous Blade Vibrations","authors":"Anne-Lise Fiquet, S. Aubert, N. Buffaz, A. Vercoutter, C. Brandstetter","doi":"10.3390/ijtpp7010006","DOIUrl":"https://doi.org/10.3390/ijtpp7010006","url":null,"abstract":"Non-synchronous blade vibrations have been observed in an experimental multi-stage high-speed compressor setup at part-speed conditions. A detailed numerical study has been carried out to understand the observed phenomenon by performing unsteady full-annulus Reynolds-Averaged Navier–Stokes (RANS) simulations of the whole setup using the solver elsA. Several operating conditions have been simulated to observe this kind of phenomena along a speedline of interest. Based on the simulation results, the physical source of the non-synchronous blade vibration is identified: An aerodynamic disturbance appears in a highly loaded downstream rotor and excites a spinning acoustic mode. A “lock-in” phenomenon occurs between the blade boundary layer oscillations and the spinning acoustic mode. The establishment of axially propagating acoustic waves can lead to a complex coupling mechanism and this phenomenon is highly relevant in understanding the multi-physical interactions appearing in modern compressors. It is shown that aerodynamic disturbances occurring downstream can lead to critical excitation of rotor blades in upstream stages due to an axially propagating acoustic wave. The paper includes the analysis of a relevant transient test and a detailed analysis of the numerical results. The study shows the capability and necessity of a full-annulus multistage simulation to understand the phenomenon.","PeriodicalId":36626,"journal":{"name":"International Journal of Turbomachinery, Propulsion and Power","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2022-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48954875","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

A Low Order Flow Network Model for Double-Wall Effusion Cooling Systems 双壁射流冷却系统的低阶流网络模型

IF 1.4

International Journal of Turbomachinery, Propulsion and Power Pub Date : 2022-02-02 DOI: 10.3390/ijtpp7010005

Michael van de Noort, P. Ireland

引用次数: 1

Acknowledgment to Reviewers of IJTPP in 2021 向2021年IJTPP审稿人致谢

IF 1.4

International Journal of Turbomachinery, Propulsion and Power Pub Date : 2022-01-31 DOI: 10.3390/ijtpp7010004

引用次数: 0

Retrofittable Solutions Capability for Gas Turbine Compressors 燃气轮机压缩机的改造解决方案能力

IF 1.4

International Journal of Turbomachinery, Propulsion and Power Pub Date : 2022-01-11 DOI: 10.3390/ijtpp7010003

M. Ricci, Stefano Gino Mosele, Marcello Benvenuto, Pio Astrua, R. Pacciani, M. Marconcini

{"title":"Retrofittable Solutions Capability for Gas Turbine Compressors","authors":"M. Ricci, Stefano Gino Mosele, Marcello Benvenuto, Pio Astrua, R. Pacciani, M. Marconcini","doi":"10.3390/ijtpp7010003","DOIUrl":"https://doi.org/10.3390/ijtpp7010003","url":null,"abstract":"The increasing introduction of renewable energy capacity has changed the perspective on the operation of conventional power plants, introducing the necessity of reaching extreme off-design conditions. There is a strong interest in the development and optimization of technologies that can be retrofitted to an existing power plant to enhance flexibility as well as increase performance and lower emissions. Under the framework of the European project TURBO-REFLEX, a typical F-class gas turbine compressor designed and manufactured by Ansaldo Energia has been studied. Numerical analyses were performed using the TRAF code, which is a state-of-the-art 3D CFD RANS/URANS flow solver. In order to assess the feasibility of lower minimum environmental load operation, by utilizing a reduction in the compressor outlet mass-flow rate, with a safe stability margin, two different solutions have been analyzed: blow-off extractions and extra-closure of Variable Inlet Guide Vanes. The numerical steady-state results are compared and discussed in relation to an experimental campaign, which was performed by Ansaldo Energia. The purpose is to identify the feasibility of the technologies and implementation opportunity in the existing thermal power plant fleet.","PeriodicalId":36626,"journal":{"name":"International Journal of Turbomachinery, Propulsion and Power","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2022-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42725484","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: 4