遠心羽根車に作用するふれまわり流体力の簡単な予測法の提案とその実験的検証

概要

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A simplified method for the estimation of whirling forces on a centrifugal impeller in a vaned diffuser is proposed. It is shown that the pressure increase in a whirling impeller flow passage is represented by three components: Euler's head, inertial pressure increase, and that caused by centrifugal force due to whirling motion. Euler's head is estimated by quasi-steady use of experimentally determined impeller steady performance. In the same way, the pressure increase in the diffuser is estimated from its steady performance and inertial effects. Based on these ideas and some other assumptions including linearization, the pressure distribution around the whirling impeller is determined. Experimental verifications at zero whirl velocity were made for three different diffusers. At larger flow rates, reasonable agreements between estimated and measured pressure forces were obtained, and it was shown that the forces promote inpeller whirl in the same direction as impeller rotation. Only qualitative agreements were obtained at smaller flow rates.
一般社団法人日本機械学会の論文
1989-06-25