To predict the three-dimensional and unsteady flow features of surge accurately and efficiently,a method of surge simulation for centrifugal compressors based on the three-dimensional body-force model was proposed.The method was further validated on a transonic centrifugal compressor.Typical flow field features like the development of the recirculation bubble at the impeller inlet tip,the existence of rotating stall during surge,and volute-induced asymmetry were captured.By comparing against the unsteady Reynolds averaged Navier-Stokes(URANS)results(validated by the experimental results),it can be shown that the proposed method is capable of predicting key features of surge,with the calculation time about 1/20 of the URANS method.
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