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Study of Pump Abnormal Characteristics from Prevention toward Suppression and Control

从预防到抑制的水泵异常特性研究

基本信息

批准号：
11555055
负责人：
TSUKAMOTO Hiroshi
金额：
$ 8.83万
依托单位：
KYUSHU INSTITUTE OF TECHNOLOGY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11555055/
关键词：
Pump Unsteady Flow Unstable Characteristics Cavitation Pressure Fluctuations Viscous Flow Analysis CFD Unsteady Hydraulic Force 流れ制御

项目摘要

A variety of unstable characteristics of turbopumps were studied to develop the flow control methods for the stable pump operations. Common factor was tried to find for-various unstable phenomena through the study of five different type unsteady phenomena in turbopumps.[Osaka University Group]: Four bladed inducer was studied on inlet distortion, and then unsteady stress on blades was found to be induced by the interaction between cavities induced by inlet distortion and alternative blade cavitations. And three bladed inducer was found to generate the higher order rotating cavitations.[Nagoya University Group]: Two different specific speed mixed flow pumps were tested to study the decrease in pumping action at low suction pressure. Flow distributions at pump impeller inlet are related to cavitations number.[Kyushu University Group] : Tandem type rotating cascade as well as high blade outlet angle was tested to suppress and control the air lock phenomena at high void ratio. And control system for the blade outlet angle was tested to get the higher pump efficiency.[Kyushu Institute of Technology Group]: Unsteady flow structures were studied to get the pre-unstable signals for the prediction of the occurrence of unstable phenomena of diffuser pump at low discharge.[Yokohama National University Group]: Slit on diffuser wail, the J-Groove, was tested to suppress the rotating vortex core at strong inlet distortion in conical diffuser.The J-Groove was found to be effective for the suppression of pressure fluctuations due to strong rotating flow up to 46 percent.

研究了涡轮泵的各种不稳定特性，提出了涡轮泵稳定运行的流量控制方法。本文通过对涡轮泵中五种不同类型的非定常现象的研究，试图找出各种非定常现象的共性。【大坂大学组】：研究了四叶片诱导轮在进口畸变下的非定常应力，发现进口畸变诱导的空泡与叶片交替空泡的相互作用在叶片上产生了非定常应力。三叶片诱导轮的旋转空泡产生的频率较高。[名古屋大学组]：测试了两种不同比速的混流泵，以研究低吸入压力下泵送作用的降低。泵叶轮进口处的流量分布与汽蚀数有关。【九州大学研究组】：对串列型旋转叶栅以及高叶片出口角进行了试验，以抑制和控制高空隙率下的气阻现象。并对叶片出口角控制系统进行了试验研究，以获得较高的泵效。【九州技术研究所集团】：研究了非稳定流结构，以获得预不稳定信号，用于预测低流量时扩散泵不稳定现象的发生。【横滨国立大学研究组】：为了抑制锥形扩压器内强进口畸变时的旋转涡核，对扩压器壁面上的狭缝--J形槽进行了试验。结果发现，J形槽对抑制高达46%的强旋转流引起的压力波动有效。