Abstract
Separations in the corner region formed by the suction surface and endwall are inherent flow feature of axial compressors. Especially in off-design conditions the corner separation can become severe and lead to strong non-equilibrium turbulence. To simulate the flow field correctly, the transport process of non-equilibrium turbulence must be predicted reasonably. In the present work, S-A model is modified based on the analysis of turbulence transport nature. Several studies are carried out for two cases. Firstly the turbulence transport processes are investigated systemically grounding on the experiment data and RSM model results of a 3D corner separation flow in a linear PVD cascade. According to the fact that different non-equilibrium turbulence transport nature at different operating conditions, a modification method of variational model parameter has been proposed and a functional expression of the model parameter over mass flow rate is drawn out. Then by the numerical investigations on a low-speed large-scale axial compressor (LLAC), a functional expression with more embedded physics is developed. The modified S-A model is capable of predicting flow details and the overall performance of a compressor at off-design conditions .
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