Comparison of Cooling Different Parts in a High Pressure Ratio Centrifugal Compressor

Cooling in a centrifugal compressor can improve the performance and reduce the impeller temperature. In a centrifugal compressor, external walls can be cool down, which is known as the shell cooling. This method avoids undesirable effects induced by other cooling methods. Cooling can be applied on different external walls, such as the shroud, diffuser or the back plate. This paper focuses on seeking the most effective cooling place to increase the performance and reduce the impeller temperature. It is found that shroud cooling improves the compressor performance the most. Shroud cooling with 2400 W of cooling power increases the pressure ratio by 4.6% and efficiency by 1.49%. Each 500 W increase in the shroud cooling power, increases the efficiency by 0.3%. Diffuser cooling and back plate cooling have an identical effect on the polytropic efficiency. However, back plate cooling increases the pressure ratio more than diffuser cooling. Furthermore, only back plate cooling reduces the impeller temperature, and with 2400 W of cooling power, the impeller temperature reduces by 45 K.

[1]  P. Bulat,et al.  Comparison of Turbulence Models in the Calculation of Supersonic Separated Flows , 2013 .

[2]  Hirata Yutaka,et al.  Aerodynamic Design of Centrifugal Compressor for AT14 Turbocharger , 2010 .

[3]  Satya N. Atluri,et al.  Computational heat transfer , 1986 .

[4]  Tomoki Kawakubo,et al.  A Fast Method for Conjugate Heat Transfer Analysis of Centrifugal Compressor , 2007 .

[5]  E. Broadbent.  Flows with heat addition , 1976 .

[6]  Nicholas C. Baines.  Fundamentals of Turbocharging , 2005 .

[7]  F. Menter.  Two-equation eddy-viscosity turbulence models for engineering applications , 1994 .

[8]  T. Kawakubo,et al.  Prediction and measurement of Turbocharger compressor wheel temperature , 2006 .

[9]  Qinghua Deng,et al.  Study on Aerodynamic Redesign of a High Pressure Ratio Centrifugal Compressor , 2010 .

[10]  Hartmut Krain,et al.  Flow Study of a Redesigned High-Pressure-Ratio Centrifugal Compressor , 2008 .

[11]  Qun Zheng,et al.  Thermodynamic Analyses of Wet Compression Process in the Compressor of Gas Turbine , 2003 .

[12]  Dieter Bohn,et al.  Conjugate Flow and Heat Transfer Investigation of a Turbo Charger , 2005 .

[13]  Jiri Oldrich.  Advanced Polytropic Calculation Method of Centrifugal Compressor , 2010 .

[14]  Xinqian Zheng,et al.  Performance improvement of a high pressure ratio centrifugal compressor by integrated cooling , 2016 .

[15]  Lei Jin,et al.  Effect of temperature on the strength of a centrifugal compressor impeller for a turbocharger , 2013 .

[16]  T. M. Fesich,et al.  The Efficiency of Turbocharger Compressors With Diabatic Flows , 2010 .

[17]  Yasuo Takahashi,et al.  Inlet Air Cooling With Overspray Applied to a Two-Stage Centrifugal Compressor , 2008 .

[18]  Tom Verstraete,et al.  A NOVEL METHOD FOR THE COMPUTATION OF CONJUGATE HEAT TRANSFER WITH COUPLED SOLVERS , 2009 .

[19]  Mohammad Ameri,et al.  The study of capacity enhancement of the Chabahar gas turbine installation using an absorption chiller , 2004 .

[20]  Mojtaba Tahani,et al.  Analysis of gas turbine operating parameters with inlet fogging and wet compression processes , 2010 .

[21]  Cyrus B. Meher-Homji,et al.  Inlet Fogging of Gas Turbine Engines: Climatic Analysis of Gas Turbine Evaporative Cooling Potential of International Locations , 2002 .

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

[24]  Cyrus B. Meher-Homji,et al.  Parametric Analysis of Existing Gas Turbines With Inlet Evaporative and Overspray Fogging , 2002 .

[25]  H. Krain,et al.  Aerodynamics of a Centrifugal Compressor Impeller With Transonic Inlet Conditions , 1995 .