报告题目🫅🏽：Fluid exciting force acting on the blades of hydro turbines and pumps due to cavitation and rotor-stator Interaction

报 告 人：日本早稻田大学教授 宫川和芳 先生

报告时间：2015年8月25日（星期二）14：30

报告地点：热能工程系报告厅

宫川和芳教授简介：

宫川和芳先生早年毕业于日本早稻田大学🕯，获大阪大学工学博士学位。曾在日本三菱重工业株式会社供职长达二十多年，从事透平机械（压缩机🤽🏼‍♀️🛬、泵🧙、抽水蓄能机组、螺旋桨等）相关技术研究🪀，先后担任三菱重工技术本部研究员👨‍🎓、主任研究员🧏🏿、主席研究员🏙🤷🏿‍♀️，长崎研究所副所长。在长期的实际工作中，积累了极其丰富的工程经验，在日本乃至世界透平机械工业领域享有盛誉。

宫川和芳先生于2011年被早稻田大学作为特殊人才引进，现任早稻田大学基干理工学部机械科学航空学科教授💮，活跃在国际流体工程学界👨🏽‍🚒♓️。

报告摘要👩🏼‍🎤：

In this study, the performance and the internal flow of one stage model centrifugal pump with both vaned and vaneless diffuser were investigated. To measure the internal flow of the diffuser and the impeller easily, air was used in this pump test. As a result of measuring pressure fluctuation, the rotating stall was observed in the vaned and vaneless diffuser. We clarified the generating mechanism and characteristics of the rotating stall in the diffuser and the difference between the unsteady flow fields in both diffusers. In case of the vaned diffuser, the number of rotating stall cells were 4 in the diffuser and the cell propagation speed ratio was about 5 percent of the impeller rotating speed. On the other hand, in case of the vaneless diffuser, the cell number was 2, and the propagation speed ratio was about 10 percent of that. These phenomena in both diffuser pumps were simulated by unsteady 2D and 3D CFD computations. By using these computations, the vortex at the trailing edge of the diffuser vanes blocked the flow and induced separate flow at the leading edge resulted in the rotating stall．This research indicated that these vortices induced the total pressure loss increasing. Also, the rotating stall was found not only in the diffuser but also in the impeller by the flow simulation of the vaneless diffuser. And it was confirmed that the vortices at the impeller trailing edge and leading edge in the stall cells cause the total pressure loss.