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A new 1D method for assessing volute induced circumferential pressure distortion at the exit of a centrifugal impeller 评估离心叶轮出口处蜗壳诱导的环向压力畸变的一种新的一维方法
13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics Pub Date : 1900-01-01 DOI: 10.29008/ETC2019-437
T. Ceyrowsky, A. Hildebrandt, R. Schwarze
{"title":"A new 1D method for assessing volute induced circumferential pressure distortion at the exit of a centrifugal impeller","authors":"T. Ceyrowsky, A. Hildebrandt, R. Schwarze","doi":"10.29008/ETC2019-437","DOIUrl":"https://doi.org/10.29008/ETC2019-437","url":null,"abstract":"Volute induced static pressure distortion may degrade impeller performance. In high-pressure applications, it can also severely affect mechanical operation. It is therefore worthwhile, to know the magnitude of pressure distortion at impeller exit. The authors present a detailed study of aerodynamic impeller-volute interaction. Firstly, CFD simulations of a volute stage are analysed: The distortion of radial velocity is a consequence of the volute’s pressure field and remains almost constant throughout the vaneless diffuser. In contrast, at impeller exit, local discharge pressure determines tangential velocity, whereas towards diffuser exit, it is affected by the volute’s pressure field. Aerodynamic blockage within the diffuser reduces static pressure at diffuser exit and hence mitigates absolute distortion. With these findings, a new 1D method for predicting the static pressure distortion at impeller exit is derived. Testing the model against CFD-results of further volute stages yields very good agreement at various operating conditions.","PeriodicalId":268187,"journal":{"name":"13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics","volume":"1 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":"129893697","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
Experimental research of noise reduction possibilities of an axial fan with an additional contra-rotor 附加反转轴流风机降噪可能性的实验研究
13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics Pub Date : 1900-01-01 DOI: 10.29008/etc2019-399
J. Blaszczak, W. Kryłłowicz
{"title":"Experimental research of noise reduction possibilities of an axial fan with an additional contra-rotor","authors":"J. Blaszczak, W. Kryłłowicz","doi":"10.29008/etc2019-399","DOIUrl":"https://doi.org/10.29008/etc2019-399","url":null,"abstract":"This work refers to investigations of the noise propagation of a fan with an inlet contra-rotating rotor. The main goal was to find if there were regions of rotational frequency where the noise levels emitted by the system may be lower than expected. The measurements were performed at Lodz University of Technology in the aeroacoustic anechoic chamber. Constant rotational speed of the first rod-rotor was set-up as constant with varying rotational speed of the second rotor (the fan). The system was similar to one of the NASA earlier experiments. The analysis showed correlations between the emitted noise levels and the rotational speeds of the rotors. Next, the noise emitted only by the second rotor (the fan) was compared with the noise of two co-operating rotors. Some regions, where the noise of the fan was reduced due to the presence of the second contra-rotating rotor at the inlet, gave a base for future investigations. The issue is important especially in cases where quiet electric drives can be used and the aerodynamic noise is crucial. The presented results can be used in similar systems in modern flow machinery, aeroengines configurations, double-rotor drones, as well as, due to the simplicity of the system and its geometry, for verification of numerical methods.","PeriodicalId":268187,"journal":{"name":"13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics","volume":"123 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":"127049273","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 design of circumferential groove casing treatments in a radial compressor 径向压气机周向槽机匣处理设计的数值研究
13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics Pub Date : 1900-01-01 DOI: 10.29008/ETC2019-038
Simon Bareiss, D. Vogt
{"title":"Numerical investigation on the design of circumferential groove casing treatments in a radial compressor","authors":"Simon Bareiss, D. Vogt","doi":"10.29008/ETC2019-038","DOIUrl":"https://doi.org/10.29008/ETC2019-038","url":null,"abstract":"A parametrized numerical study is performed to assess the design of circumferential grooves in a radial compressor. The validation with experimental data shows good agreement for the baseline case. Groove location, shape and number are varied, based on an initial design. The results show clear trends, which correlate with the impeller performance. Improvements in terms of pressure rise and efficiency are observed for groove locations towards the inducer. Moreover, high inclination angles and a normalized width at the casing of 4% to 10% of the meridional blade length are found to be most effective for all locations. Results obtained with multiple groove configurations suggest that the respective single groove effects can be partially superimposed and do not degenerate the performance by interference. The subsequent evaluation of the near tip flow field shows a weakening and deflection of the tip vortex for inducer grooves resulting in decreased blockage. Additionally, a splitter blade leading edge separation, emerging towards lower flow rates, is effectively suppressed. This is supported by grooves in the bend region, which prevent local leakage backflows.  In contrast to that, grooves near the outlet are found to be ineffective as losses increase.","PeriodicalId":268187,"journal":{"name":"13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics","volume":"13 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":"125259830","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 study of wake effects on the boundary layer of a high lift turbine cascade at several strouhal numbers and flow coefficients 高升力涡轮叶栅在不同流场数和流量系数下边界层尾迹效应的数值研究
13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics Pub Date : 1900-01-01 DOI: 10.29008/ETC2019-251
A. Führing, D. Kožulović, M. Franke
{"title":"Numerical study of wake effects on the boundary layer of a high lift turbine cascade at several strouhal numbers and flow coefficients","authors":"A. Führing, D. Kožulović, M. Franke","doi":"10.29008/ETC2019-251","DOIUrl":"https://doi.org/10.29008/ETC2019-251","url":null,"abstract":"In this study, the flow through the MTU-T160 low pressure turbine cascade is computed in a set of steady and unsteady RANS simulations involving wake impingment. Two characteristic variables, the Strouhal number Sr as well as the flow coefficient φ are modified while keeping the Reynolds number and Mach number fixed. It is observed that increasing Sr leads to lower total pressure loss of the cascade for φ ≤ 1 and higher total pressure loss for φ > 1 while increasing φ generally leads to larger losses. While reducing the size of the separation bubble, increased values of φ also produce more turbulence friction losses upstream of the separation and downstream of the reattachment of the flow compared to lower flow coefficients. Steady state simulations with mixing plane interface show significantly different results compared to unsteady time-mean simulations in terms of qualitative and quantitative loss change with variation of Sr and φ.","PeriodicalId":268187,"journal":{"name":"13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics","volume":"215 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":"121726747","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 of Two-Phase air-water flow in a centrifugal pump with closed or semi-open impeller 闭式或半开式叶轮离心泵内两相空气-水流动的数值研究
13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics Pub Date : 1900-01-01 DOI: 10.29008/ETC2019-011
Markus Hundshagen, M. Mansour, D. Thévenin, R. Skoda
{"title":"Numerical investigation of Two-Phase air-water flow in a centrifugal pump with closed or semi-open impeller","authors":"Markus Hundshagen, M. Mansour, D. Thévenin, R. Skoda","doi":"10.29008/ETC2019-011","DOIUrl":"https://doi.org/10.29008/ETC2019-011","url":null,"abstract":"3D CFD-simulations of a centrifugal research pump in single- and two-phase flow conditions with closed and semi-open impeller are performed. In single-phase flow, a satisfactory agreement to experimental data in terms of head prediction is obtained. For two-phase flows, an Eulerian-Eulerian monodisperse model in combination with a statistical turbulence model is used. A grid dependency is unavoidable for large bubbles since a bubble diameter exceeding the grid scale limits a further refinement of finite volume grid cells. The air bubble diameter is a key parameter for pump performance calculation, which can be shown by a bubble size variation, in which the experimental pump head is captured qualitatively well. Further studies will focus on the improvement of the two-phase model to allow simulations of dense disperse phase and bubble sizes larger than the grid scale. Enabling polydispersity and bubble interaction are assumed to be essential for quantitative pump head prediction.","PeriodicalId":268187,"journal":{"name":"13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics","volume":"7 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":"130255348","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: 11
The continuous adjoint approach applied to the stabilized finite-element formulation of the incompressible Navier-Stokes equations 连续伴随法应用于不可压缩Navier-Stokes方程的稳定有限元公式
13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics Pub Date : 1900-01-01 DOI: 10.29008/ETC2019-242
B. Janssens, Pierre Vandenschrick, K. Stevens, G. Alessi
{"title":"The continuous adjoint approach applied to the stabilized finite-element formulation of the incompressible Navier-Stokes equations","authors":"B. Janssens, Pierre Vandenschrick, K. Stevens, G. Alessi","doi":"10.29008/ETC2019-242","DOIUrl":"https://doi.org/10.29008/ETC2019-242","url":null,"abstract":"The finite element solution of the continuous adjoint to the Navier-Stokes equations requires stabilization similar to that required for the flow problem. This paper presents the stabilized adjoint equations and their boundary conditions, with the weak forms for the equations and boundary conditions. In addition to this, the weak form of the direct differentiation method is also presented. Finally, a test case using an S-shaped duct shows the agreement between the direct differentiation method and the adjoint method. Sensitivities and values of the adjoint solutions are given as validation data.","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":"134174108","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
Erosion behavior on a large-sized centrifugal fan 大型离心风机的冲蚀特性
13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics Pub Date : 1900-01-01 DOI: 10.29008/ETC2019-389
Nicola Aldi, N. Casari, M. Pinelli, A. Suman, Alessandro Vulpio, Paolo Saccenti, Riccardo Beretta, A. Fortini, M. Merlin
{"title":"Erosion behavior on a large-sized centrifugal fan","authors":"Nicola Aldi, N. Casari, M. Pinelli, A. Suman, Alessandro Vulpio, Paolo Saccenti, Riccardo Beretta, A. Fortini, M. Merlin","doi":"10.29008/ETC2019-389","DOIUrl":"https://doi.org/10.29008/ETC2019-389","url":null,"abstract":"Several production processes involve the use of turbomachinery for the transport of gases with high concentrations of solid particles. Centrifugal fans employed in clinker production operate under severe erosive conditions. To limit the erosive wear of specific fan zones, wear-resistant plates are used. This paper presents a numerical investigation of the erosion behavior of a large-sized centrifugal fan operating in a cement factory. A contaminant characterization is carried out to define particle shape, size distribution and physical characteristics (i.e. density) on which the particle model is based. In addition, the surface analysis and microstructural characterization of the weld-deposited hardfacing alloy provide the wear-resistant coating features. Particles are tracked with a Lagrangian approach on the instantaneous flow fields corresponding to different relative impeller-to-volute positions. The particle impact angle is found to have a significant influence on the erosion of fan surfaces. CFD predictions are in close agreement with on-field erosion detections.","PeriodicalId":268187,"journal":{"name":"13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics","volume":"10 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":"124142722","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: 6
Efficient simulation of inlet distortion in engine fan stage using nonlinear harmonic method 用非线性谐波法高效模拟发动机风扇级进气道畸变
13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics Pub Date : 1900-01-01 DOI: 10.29008/etc2019-219
O. Mehdizadeh, S. Vilmin, B. Tartinville, C. Hirsch
{"title":"Efficient simulation of inlet distortion in engine fan stage using nonlinear harmonic method","authors":"O. Mehdizadeh, S. Vilmin, B. Tartinville, C. Hirsch","doi":"10.29008/etc2019-219","DOIUrl":"https://doi.org/10.29008/etc2019-219","url":null,"abstract":"The nonlinear harmonic method (NLH) for efficiently simulating unsteady turbomachinery fluid dynamics in the frequency domain is described, and the details of its application to inlet distortion are discussed. The method capabilities are then demonstrated on the NASA transonic fan Stage 67 with a generic inlet distortion. Comparison of the results with the available experimental data confirms that the reconstructed unsteady flow solution obtained by the nonlinear harmonic method captures the main flow characteristics of the inlet distortion interaction with the fan stage such as the swirl associated with the upstream flow redistribution, the total pressure distortion transfer, and the generation of the total temperature distortion. The method offers a cost saving of two orders of magnitude compared to conventional time-domain unsteady methods for this type of applications.","PeriodicalId":268187,"journal":{"name":"13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics","volume":"479 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":"116191745","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
Effect of Stall Fence on the Performance of an Axial Turbine for Wave Energy Conversion 失速栅栏对轴向水轮机波浪能转换性能的影响
13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics Pub Date : 1900-01-01 DOI: 10.29008/ETC2019-164
Tapas K. Das, A. Samad
{"title":"Effect of Stall Fence on the Performance of an Axial Turbine for Wave Energy Conversion","authors":"Tapas K. Das, A. Samad","doi":"10.29008/ETC2019-164","DOIUrl":"https://doi.org/10.29008/ETC2019-164","url":null,"abstract":"Wells turbine is one type of axial turbine exclusively used for wave energy conversion in Oscillating Water Column type wave energy conversion device. It is a bi-directional turbine which can rotate in one direction irrespective of the direction of airflow. One of the main disadvantages of this turbine is the stall phenomenon, where the torque, as well as efficiency, drops drastically at a particular angle of attack. The postponement of stall can be achieved by installing fences along the chord of the blade at a distance from the hub. In the present work, a numerical analysis of Wells turbine with the stall fence is carried out using commercial CFD tool ANSYS. The performance characteristics of the turbine are investigated for different number of stall fences at different distances along the span of the blade. A detail flow analysis is presented to explain the effect of the stall fence on this particular turbine.","PeriodicalId":268187,"journal":{"name":"13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics","volume":"71 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":"124625358","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
Coupled FE-CFD analysis of transient conjugate heat transfer 瞬态共轭传热的FE-CFD耦合分析
13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics Pub Date : 1900-01-01 DOI: 10.29008/ETC2019-158
A. Schindler, S. Brack, J. Wolfersdorf
{"title":"Coupled FE-CFD analysis of transient conjugate heat transfer","authors":"A. Schindler, S. Brack, J. Wolfersdorf","doi":"10.29008/ETC2019-158","DOIUrl":"https://doi.org/10.29008/ETC2019-158","url":null,"abstract":"Steady and transient conjugate heat transfer is examined using an efficient approach to couple a finite element code with a computational fluid dynamics solver. A combination of Dirichlet and Robin conditions was used to exchange data at the interface between adjacent solid and fluid domains. Among the computational aspects considered are appropriate coupling coefficients for the Robin condition, the coupling's convergence behavior and stability limits as well as the accuracy of the solution. Starting from a steady state coupling, transient solid calculations were coupled with a sequence of steady fluid solutions. Of particular interest was the extension of findings from a validation case with two-dimensional flow to a more complex one with flow around a three-dimensional vortex generator. The results obtained with the coupling method show good agreement with conjugate reference calculations and transient experiments that examined the spatio-temporal surface temperature using infrared thermography.","PeriodicalId":268187,"journal":{"name":"13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics","volume":"131 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":"130548407","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
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