0609 小弦節比翼列ディフューザの非定常揚力変動の数値解析(OS6-2 流体機械のCFD解析最前線,オーガナイズドセッション)

概要

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A low solidity cascade diffuser (LSD) shows features of a wide operating range and a high pressure ratio in centrifugal compressors and blowers. It was shown in the authors' previous steady flow analysis that formations of the stable and intense vortex in the shroud tip-groove and the secondary flow moving circumferentially along the shroud wall toward the impeller exit are the key factors for achieving a high LSD performance at small flow rates. In the present study, the effect of unsteadiness of the jet-wake flow on the formation of strong vortex in the tip-groove and the secondary flow moving circumferentially on the diffuser wall were investigated by comparing the simulation results between unsteady flow analysis and steady flow one. It is clearly shown that the lift force of the LSD blade fluctuates periodically with the blade passing frequency, however, the flow behaviors of the vortex in the tip-groove and the circumferentially moving secondary flow are little affected by the jet-wake flow.
一般社団法人日本機械学会の論文
2010-10-29