半径比の大きなベーンレスディフューザにおける特異な旋回失速 (<小特集>タ-ボ機械の内部流れと定常・否定常特性)

概要

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Rotating stall in the radial vaneless diffuser with large radius is studied experimentally. The static pressure on the wall and the velocity distribution are measured and analyzed, and the critical flow angle calculated theoretically is compared with the experimental one. Measured velocity distributions show that the existence of reverse flow is closely related to the occurrence of stall. In our study, rotating stall occurs at a much larger flow angle than that in conventional studies. Also, in a wide range of flow angle, a compound pressure vibration of two different frequencies is observed, which shows the steady coexistence of two different types of stall cells. Furthermore, the dimensionless frequency of stall propagations is more strongly dependent on the flow angle than in the conventional cases. These results are due mainly to the large ratio of radius in our diffuser.
社団法人日本機械学会の論文
1995-11-25