歳差運動する遠心羽根車シュラウドに作用する流体力モーメントの研究 (<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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A detailed study of the fluid moment on a precessing impeller shroud has been made. Experiments and calculations based on a bulk-flow model were carried out to elucidate the unsteady flow between the impeller shroud and the casing. The fluid moment was estimated from the pressure distribution on the impeller shroud in the precession motion. The results of the experiments were compared with those of the calculations. It was found that : (1) the moment largely depends on the leakage flow rate and the pressure loss at the impeller outer radius ; (2) a bulk-flow model incorporating the measured behavior of the pressure loss can simulate the complete leakage flow distribution fairly well ; (3) The fluid moment is mainly caused by the two-dimensional inviscid unsteady flow due to the precession motion.
1995-11-25