圧縮性LES解析による遠心ブロワ内部の非定常圧力変動場の分析

抄録

Large Eddy Simulation (LES) for compressible flow was conducted to analyze the pressure fluctuation at 17% of the impeller rotation frequency, which was confirmed at the impeller inlet and diffuser inlet under the operation condition on the lower flow rate in centrifugal blower with peripheral Mach number of 0.48. It was found that the pressure field in the diffuser generally decreases when the region of large radial flow caused by the diffuser rotating stall passes through the scroll tongue. As the pressure decrease in the diffuser, the pressure upstream of the impeller also decrease.