B-14 スプリッタ付き遠心圧縮機の遷音速内部流動に関する研究(空力・圧縮機,一般講演)

概要

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The purpose of this study is to get a better understanding of transonic flow fields in a centrifugal compressor with splitter blades. RANS (Reynolds-Averaged Navier-Stokes) simulations were performed for several operating conditions to investigate the change in the flow field. Vortical flow structures and separated boundary layer were analyzed. The simulation showed that a low velocity region was generated near the tip at lower flow rate conditions. The low velocity region was expanded as the flow rate was decreased, and interacted with the pressure surface of the blade near the leading edge. This caused the abrupt descent of the blade loading near the tip of the leading edge, and an accumulation of high entropy near the casing of the suction side. Moreover, the interaction with the pressure surface of the full blade led to a leading edge separation near the tip, eventually the impeller stall.
2009-10-21