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Modelling of turbulence in screw compressor flows

DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal.2080
pages 2028-2037

M. Kethidi
Centre for Positive Displacement Compressor Technology, City University, London EC1V 0HB, U.K.

Ahmed Kovacevic
Centre for Positive Displacement Compressor Technology, City University, London EC1V 0HB, U.K.

Nikola Stosic
Centre for Positive Displacement Compressor Technology, City University, London EC1V 0HB, U.K.

S. Rane
Centre for Positive Displacement Compressor Technology, City University, London EC1V 0HB, U.K.

Sinopsis

In order to evaluate how turbulence modelling affects the prediction of flow in screw compressors, the standard k−ε, Menter SST and SSG Reynolds Stress turbulence models have been tested and compared with measurements obtained from Laser Doppler Velocimetry (LDV). Numerical aspects such as the choice of differencing schemes and solver characteristics are discussed. This study shows that the choice of numerical schemes and turbulence models has a noticable influence on predicted flow characteritics. It is concluded that CFD predictions of flow characteristics can be improved by better rotor grid generation methods and tuning the turbulence model to suit the flow characteristics of twin screw machines.

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