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Analysis of tip-gap size on tip-leakage flow in an axial fan at design and off-design operating conditions 设计工况和非设计工况下轴流风机叶尖间隙大小对叶尖泄漏流的影响分析
13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics Pub Date : 1900-01-01 DOI: 10.29008/ETC2019-306
S. M. A. Moghadam, M. Meinke, W. Schröder
{"title":"Analysis of tip-gap size on tip-leakage flow in an axial fan at design and off-design operating conditions","authors":"S. M. A. Moghadam, M. Meinke, W. Schröder","doi":"10.29008/ETC2019-306","DOIUrl":"https://doi.org/10.29008/ETC2019-306","url":null,"abstract":"Large-eddy simulations of the flow in a ducted axial fan are performed to investigate the dynamics of tip clearance flow for several tip-gap sizes at design and off-design operating conditions. The Navier-Stokes equations are solved on a multi-block structured 140-million-cell mesh in a rotating frame of reference for a single out of five blades with periodic boundary conditions in the circumferential direction and prescribed inflow conditions based on experimental data. The results show that increasing the tip-gap size results in various vortices in the tip-gap region, i.e., tip-leakage, separation, and induced vortices, which enlarge the diameter and the strength of the main tip vortex. For the off-design operating condition, the tip-gap vortex for the smallest tip-gap size decays faster than that for the design operating condition. For the largest tip clearance, spiral vortex breakdown occurs at the design operating condition.","PeriodicalId":268187,"journal":{"name":"13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127601615","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
Prediction of aerodynamically induced fan blade vibration due to boundary layer ingestion 边界层吸入引起的空气动力诱导风扇叶片振动预测
13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics Pub Date : 1900-01-01 DOI: 10.29008/ETC2019-370
Franziska Eichner, J. Belz, P. Winkelmann, R. Schnell, T. Lengyel-Kampmann
{"title":"Prediction of aerodynamically induced fan blade vibration due to boundary layer ingestion","authors":"Franziska Eichner, J. Belz, P. Winkelmann, R. Schnell, T. Lengyel-Kampmann","doi":"10.29008/ETC2019-370","DOIUrl":"https://doi.org/10.29008/ETC2019-370","url":null,"abstract":"New aircraft concepts such as boundary layer ingestion (BLI) are essential to achieve a reduction of engine emissions and aircraft noise. The key-point of this concept is that the engine ingests and reaccelerate the boundary layer from the aircraft fuselage in order to increase propulsive efficiency. The investigation of the aerodynamic and aeroelastic interaction of the BLI and fan becomes necessary. For the calculation of the vibration response a process chain is established, starting by the calculation of the non uniform steady-state flow field and the resulting unsteady airloads using Harmonic Balance CFD-methods. Further the blade response is calculated with a Frequency Response Function-formulation in state space using the eigenfrequencies, eigenvectors and the aerodynamic damping of the system. Several BLI’s corresponding to different flight conditions and structural integration scenario of the engine were investigated and analysed for a wide range of rotational speed. Detailed forced response and fatigue analyses were performed for these point at peak efficiency. Resonance points with the first and second mode shape provoke significant peaks in the strain amplitudes and the inverse reserve factor (IRF). Beside that, resonance points with higher harmonics generate a relevant but not dominant contribution to fatigue.","PeriodicalId":268187,"journal":{"name":"13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128361095","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
Robust integration of real gas models into a pressure-based coupled solver 真实气体模型的鲁棒集成到基于压力的耦合求解器中
13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics Pub Date : 1900-01-01 DOI: 10.29008/ETC2019-218
L. Hanimann, L. Mangani, E. Casartelli, D. Vogt
{"title":"Robust integration of real gas models into a pressure-based coupled solver","authors":"L. Hanimann, L. Mangani, E. Casartelli, D. Vogt","doi":"10.29008/ETC2019-218","DOIUrl":"https://doi.org/10.29008/ETC2019-218","url":null,"abstract":"Today’s most common standard for compressible computational fluid dynamics is based on the ideal gas state equation. However, real gas modeling is fundamental for a wide range of applications. When expanding into the thermodynamic region of non-ideal gas, performance predictions based on ideal gas assumption are no longer valid. Therefore, more accurate models are desired for an improved classification of fluid properties. While there is a wast amount of literature about possible improvements when using real gas state equations in a numerical framework, little is known considering the actual implementation. This article will therefore focus on the robust integration of real gas flow physics in an in-house, coupled, pressure-based solver. We will point out the main difference to a numerical framework purely based on perfect gas. Final validation is given using a two stage radial compressor setup to demonstrate the generality of the chosen approach.","PeriodicalId":268187,"journal":{"name":"13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133124470","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
Numerical investigation of trailing edge flow in centrifugal pump impellers 离心泵叶轮尾缘流动的数值研究
13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics Pub Date : 1900-01-01 DOI: 10.29008/etc2019-316
O. Litfin, A. Delgado
{"title":"Numerical investigation of trailing edge flow in centrifugal pump impellers","authors":"O. Litfin, A. Delgado","doi":"10.29008/etc2019-316","DOIUrl":"https://doi.org/10.29008/etc2019-316","url":null,"abstract":"In the fields of aerodynamics and turbomachinery trailing edge flows are of great interest as they can substantially affect performance, vibration and sound emission. The present paper discusses the trailing edge and wake flow in centrifugal pump impellers. In the first part of the study the effect of the trailing edge flow on the performance of equiangular impeller blades was investigated by means of 2D steady RANS simulations for a wide range of blade angles and flow coefficients. The effect was quantified by the slip coefficient as a measure for the overall trailing edge flow deflection from the theoretical, inviscid flow through an impeller with an infinite number of blades. For the typical cut-off or knuckle-type trailing edge configuration an attached and a separated flow regime could be identified, mainly depending on the blade angle. Consequently, in the second part of the study, detached-eddy simulations were carried out, revealing the flow structures of the different trailing edge flow regimes in greater detail.","PeriodicalId":268187,"journal":{"name":"13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115280933","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
Part load resonance risk assessment of francis hydropower units 混流式水电机组部分负荷共振风险评估
13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics Pub Date : 1900-01-01 DOI: 10.29008/ETC2019-381
J. G. P. Junior, A. Favrel, C. Nicolet, F. Avellan
{"title":"Part load resonance risk assessment of francis hydropower units","authors":"J. G. P. Junior, A. Favrel, C. Nicolet, F. Avellan","doi":"10.29008/ETC2019-381","DOIUrl":"https://doi.org/10.29008/ETC2019-381","url":null,"abstract":"While operating at part load, Francis turbines feature a precessing cavitation vortex rope in its draft tube. The precession of this vortex in the elbow of the draft tube acts as a pres-sure pulsation source which frequency can match the first hydroacoustic eigenfrequency of the hydraulic system in some cases. Resonance phenomenon can be predicted by using reduced scale physical model tests and numerical simulations, but it remains challenging. This paper proposes a procedure to estimate the risk of part load resonance at the early stage of a hydropower project. The proposed procedure uses the hydroacoustic properties of a given reduced scale physical model and applies them to a large number of turbine de-signs and power plant configurations to assess the risk of resonance for each one of them. Results show that resonance are likely to occur in hydropower plants in a certain range of turbine rated head and rated discharge values. These results can then indicate if more detailed investigations in some specific hydropower projects are necessary.","PeriodicalId":268187,"journal":{"name":"13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics","volume":"114 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117255356","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
Testing, modeling and simulation of fans working with organic vapors 测试，建模和模拟与有机蒸汽工作的风扇
13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics Pub Date : 1900-01-01 DOI: 10.29008/ETC2019-195
Felix Reinker, R. Wagner, K. Hasselmann, S. Wiesche, M. Fritsche, P. Epple, Hans J. Rußwurm
{"title":"Testing, modeling and simulation of fans working with organic vapors","authors":"Felix Reinker, R. Wagner, K. Hasselmann, S. Wiesche, M. Fritsche, P. Epple, Hans J. Rußwurm","doi":"10.29008/ETC2019-195","DOIUrl":"https://doi.org/10.29008/ETC2019-195","url":null,"abstract":"The present contribution presents a test facility for fans working with organic vapors where non-ideal gas effects are relevant. In contrast to conventional testing of atmospheric fans a thermodynamic approach based on very precise temperature measurements is employed for obtaining the performance curves. The experimental data are used for validation of three-dimensional computational fluid dynamics (CFD) simulations of the organic vapor flows within the turbomachinery including real gas effects. The combined experimental and numerical analysis approach enables the assessment of conventional design rules and correlations. It is found that the influence of the Mach number on efficiency is dominant, and the expected Reynolds number scaling is fully compensated by compressibility effects in the case of an organic vapor with its low speed of sound.","PeriodicalId":268187,"journal":{"name":"13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics","volume":"113 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115801714","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 optimization of air breathing radial outflow turbines 吸气径向流出涡轮的数值优化
13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics Pub Date : 1900-01-01 DOI: 10.29008/ETC2019-215
I. Kavas, B. Saracoglu, T. Arts
{"title":"Numerical optimization of air breathing radial outflow turbines","authors":"I. Kavas, B. Saracoglu, T. Arts","doi":"10.29008/ETC2019-215","DOIUrl":"https://doi.org/10.29008/ETC2019-215","url":null,"abstract":"Small air driven alternators serve as a practical solution to be a power source for miniature electronic equipment. An air-breathing radial outflow turbine can be easily manufactured and implemented to a variety of terrestrial and aerial vehicles for auxiliary power generation. The flow characteristics of such turbines need to be understood in order to maximize the power output with a compact design. The present study aims to document a numerical optimization strategy to improve the performance characteristics of small radial outflow turbines. The geometry is parametrized such a way that it allows automatized geometry and grid generation depending on the decided geometrical variables. The optimization was then performed with in house tool of VKI. The optimum design provided 33% higher power output than the initial design at the same rotational speed and mass flow rate. The final turbine geometry is without the hub gap and has smaller and higher blades.","PeriodicalId":268187,"journal":{"name":"13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122741991","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
Numerical and experimental study of the aerodynamic and aeroelastic performance of a low pressure turbine 低压涡轮气动与气动弹性性能的数值与实验研究
13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics Pub Date : 1900-01-01 DOI: 10.29008/ETC2019-056
L. Simonassi, R. Benauer, M. Zenz, P. Leitl, Franz Heitemeir, A. Marn
{"title":"Numerical and experimental study of the aerodynamic and aeroelastic performance of a low pressure turbine","authors":"L. Simonassi, R. Benauer, M. Zenz, P. Leitl, Franz Heitemeir, A. Marn","doi":"10.29008/ETC2019-056","DOIUrl":"https://doi.org/10.29008/ETC2019-056","url":null,"abstract":"This work presents the results of an experimental and numerical investigation conducted in the framework of a project focused on the influence of inlet distortions on the aeroelastic and aerodynamic performance of a low pressure turbine. The measurements were carried out in the subsonic test turbine facility at the Institute of Thermal Turbomachinery and Machine Dynamics at Graz University of Technology. Flow measurements were performed by means of five-hole-probe. In addition, a telemetry system in combination with strain gauges was applied to acquire the rotor blades vibration data. The numerical investigation was carried out at Bionic Surface Technologies Gmbh employing the commercial tool ANSYS CFX. Reynolds-Averaged Navier-Stokes (RANS) equations were used for solving the flow-field. For the flutter analysis, the modal shapes of the rotor blades were calculated by pre-stressed modal analysis in ANSYS Mechanical and the aeroelastic solution was computed for different Inter Blade Phase Angles (IBPA).","PeriodicalId":268187,"journal":{"name":"13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics","volume":"493 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122856292","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
Modes identification and interactions in a rotor/stator academic cavity 转子/定子理论腔内模态识别与相互作用
13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics Pub Date : 1900-01-01 DOI: 10.29008/ETC2019-386
Matthieu Queguineur, L. Gicquel, G. Staffelbach
{"title":"Modes identification and interactions in a rotor/stator academic cavity","authors":"Matthieu Queguineur, L. Gicquel, G. Staffelbach","doi":"10.29008/ETC2019-386","DOIUrl":"https://doi.org/10.29008/ETC2019-386","url":null,"abstract":"Hydrodynamics instabilities in rotating stator/rotor cavity flows are of first interest for aerospace companies. Indeed, those self sustained flow waves can be at the origin of a resonating loop which involves the structure resulting in the potential destruction of turbomachinary parts. This paper aims at giving a deeper understanding on the source of the flow oscillations by investigating a rotating cavity flow by use of a global stability analysis in parallel to a Large Eddy Simulation (LES). In particular and for flows with multiple frequencies, mode dominance and interactions can be difficult to address with linear analyses. To better apprehend such equilibrium, a numerical tool named Dynamical Mode Tracking and control (DMTC) is proposed here and tested on the basis of LES. In the case of the stator/rotor cavity, without control, i.e, DMT enables to validate the source of the different modes in agreement with previous studies and linear stability. Finally by controlling the modes one by one with DMTC, interactions between the modes and mode dominance is evidenced.","PeriodicalId":268187,"journal":{"name":"13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics","volume":"30 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129345559","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
Aerothermal predictions of combustor/turbine interactions using advanced turbulence modeling 使用先进湍流模型的燃烧室/涡轮相互作用的气动热预测
13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics Pub Date : 1900-01-01 DOI: 10.29008/ETC2019-050
F. Cottier, Pierre Pinchaud, G. Dumas
{"title":"Aerothermal predictions of combustor/turbine interactions using advanced turbulence modeling","authors":"F. Cottier, Pierre Pinchaud, G. Dumas","doi":"10.29008/ETC2019-050","DOIUrl":"https://doi.org/10.29008/ETC2019-050","url":null,"abstract":"The flow and temperature fields out of a combustion chamber are characterized by high variations, spatially and temporarily. This also results in high turbulence generation. The downstream turbine stage is subject to swirling hot spots and therefore to gradients that have to be taken into account in the design and sizing of the turbine components. In addition, these spots are transported further downstream through the turbine and interact with secondary turbine flows. This paper presents comparisons between numerical calculations and measurements carried out in a cold combustor simulator – a turbine rig representative for engine OTDF and RTDF. The traverse measurements recorded after each airfoil row are compared with CFD calculations of a full turbine model including ID disc cavities. Simulating simultaneously the cold combustor and the turbine allows taking these temporal variations into account. The configuration has been computed using conventional RANS-URANS methods as well as Scale-Adaptative Simulation (SAS) for turbulence modeling, and shows that this advanced model improved the hot/cold mixing significantly.","PeriodicalId":268187,"journal":{"name":"13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124996892","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
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