J0501-3-2 スプリッター付き遠心圧縮機インペラの空力特性に及ぼす翼枚数の影響([J0501-3]流体機械の研究開発におけるEFD/CFD(3))

概要

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The objective of this study is to investigate the effect of blade count on aerodynamic characteristics of centrifugal compressor impellers with splitter blades. RANS (Reynolds-Averaged Navier-Stokes) simulations were carried out to compare the tip clearance flow field between two compressors. In the tip clearance flow field, the low velocity region, which is generated along the tip leakage vortex, expands as decreasing the flow rate. The difference in the solidity changes the stall onset point, at which the low velocity region in the tip clearance flow interacts with the leading edge of the adjacent blade and the tip clearance flow almost spills ahead of it. In the compressor with low solidity impeller, vortex breakdown happens in the tip leakage vortex because of larger blade loading, which expands the low velocity region and then leads to stall.
2010-09-04