J051054 軸流圧縮機動翼列の失速点近傍における翼端もれ渦崩壊が非定常内部流れ場に及ぼす影響([J05105]流体機械の研究開発におけるEFD/CFD(5))

概要

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At near-stall condition in a low speed axial flow compressor rotor with large tip clearance distinctive disturbances are observed, which repeat appearance and disappearance irregularly and never develop to rotating stall cells. Compared to the small tip clearance case, the pressure fluctuation on the pressure side near the leading edge of the rotor blade and the turbulence intensity near the casing wall downstream of the rotor are high in the case of large tip clearance. Using Synchronous Field Measurement Technique (SFMT), by which the instantaneous casing wall pressure distributions are acquired, and Detached Eddy Simulation (DES), the flow mechanism of the distinctive disturbances has been investigated in the present study. The measurement and DES results show that the spiral-type vortex breakdown occurs in tip leakage vortices and it makes the strong unsteadiness in the flow field across the fore part of blade passage near the casing wall.
一般社団法人日本機械学会の論文
2011-09-11