Assessment of Various Turbulence Models in a High Pressure Ratio Centrifugal Compressor With an Object Oriented CFD Code

The flow field in a high pressure ratio centrifugal compressor with a vaneless diffuser has been investigated numerically. The main goal is to assess the influence of various turbulence models suitable for internal flows with an adverse pressure gradient. The numerical analysis is performed with a 3D RANS in-house modified solver based on an object-oriented open-source library. According to previous studies from varying authors, the turbulence model is believed to be the key parameter for the discrepancy between experimental and numerical results, especially at high pressure ratios and high mass-flow. Particular care has been taken at the wall, where a detailed integration of the boundary layer has been applied. The results present different comparisons between the models and experimental data, showing the influence of using advanced turbulence models. This is done in order to capture the boundary layer behavior, especially in large adverse pressure gradient single stage machinery.

[1]  Hartmut Krain,et al.  Investigations of the Flow Through a High Pressure Ratio Centrifugal Impeller , 2002 .

[2]  B. A. Kader.  Temperature and concentration profiles in fully turbulent boundary layers , 1981 .

[3]  Thomas Esch,et al.  Heat transfer predictions based on two-equation turbulence models with advanced wall treatment , 2003 .

[4]  J. Shewchuk.  An Introduction to the Conjugate Gradient Method Without the Agonizing Pain , 1994 .

[5]  Luca Mangani,et al.  CONJUGATE HEAT TRANSFER ANALYSIS OF AN INTERNALLY COOLED TURBINE BLADES WITH AN OBJECT ORIENTED CFD CODE , 2009 .

[6]  F. Menter.  Improved two-equation k-omega turbulence models for aerodynamic flows , 1992 .

[7]  Dietmar Filsinger,et al.  Unsteady Flow in a Turbocharger Centrifugal Compressor: 3D-CFD-Simulation and Numerical and Experimental Analysis of Impeller Blade Vibration , 2005 .

[8]  R. Emmrich,et al.  Numerical and experimental investigation of a centrifugal compressor with an inducer casing bleed system , 2001 .

[9]  Hideaki Tamaki.  Effect of Recirculation Device on Performance of High Pressure Ratio Centrifugal Compressor , 2010 .

[10]  F. Menter.  ZONAL TWO EQUATION k-w TURBULENCE MODELS FOR AERODYNAMIC FLOWS , 1993 .

[11]  Hartmut Krain,et al.  Improved High Pressure Ratio Centrifugal Compressor , 2007 .

[12]  Luca Mangani,et al.  Application of an Object-Oriented CFD Code to Heat Transfer Analysis , 2008 .

[13]  Luca Mangani,et al.  Conjugate Heat Transfer Analysis of NASA C3X Film Cooled Vane With an Object-Oriented CFD Code , 2010 .

[14]  P. Durbin.  On the k-3 stagnation point anomaly , 1996 .

[15]  Liping Xu,et al.  Role of Tip Leakage in Stall of a Transonic Centrifugal Impeller , 2009 .

[16]  Luca Mangani,et al.  DEVELOPMENT AND VALIDATION OF A C++ OBJECT ORIENTED CFD CODE FOR HEAT TRANSFER ANALYSIS , 2007 .