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Self-excited Oscillation of a Liquid Filled Rotor

充液转子的自激振荡

基本信息

批准号：
62550171
负责人：
SHIGEHIKO Kaneko
金额：
$ 1.22万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1987
资助国家：
日本
起止时间：
1987 至 1988
项目状态：
已结题

项目摘要

Recently many kinds of liquid filled rotor are used in a variety of industries, for example,superconducting generator filled with liquid herium, liquid cooled turbine shaft, ultra high speed liquid centrifuge and so on. In such rotors, it is well known that there exists an unstable rotating speed range over a critical speed caused by the coupling of rotor whirling motion and oscillation of an enclosed liquid.A large number of studies were done so far mainly on the mechanism of the self-excited oscillation of a rotor caused by free surface wave. But few studies are reported in connection with the oscillation caused by interfacial wave. So in this report, self-excited oscillation of a rotor filled with two kinds of immiscible liquid such as the combination of water and oil is investigated. The influence of density ratio between two kinds of immiscible liquid and the viscosity of the heavier liquid on the unstable rotating speed range is studied both theoretically and experimentally.This report is composed by 7 chapters. In chapter 1, the purpose of this research project is described. In chapter 2, related research are reviewed. In chapter 3, analysis on the motion of a enclosed liquid is described. Natural frequencies and modes are analyzed and compared with experimental results. In chapter 4, the procedure of deriving the fluid force acting on a rotor is described under the assumption of inviscid liquid. And at the end, the way of determining the unstable rotating speed range analytically is proposed. In chapter 5, the experimental apparatus and measurement technique are introduced. In chapter 6, theoretical results are compared with experimental results. In chapter 7, the results of this project are summarized briefly.

近年来，各种充液转子广泛应用于各种工业领域，如充液超导发电机、液冷涡轮机轴、超高速液体离心机等，在这些转子中，由于转子涡动运动与封闭液体振荡的耦合作用，在临界转速以上存在一个不稳定的转速范围，到目前为止，所做的工作主要是关于自由表面波引起的转子自激振荡的机理。但关于界面波引起的振荡现象的研究报道较少。因此，本文研究了充有两种不互溶液体（如水和油的混合物）的转子的自激振动。本文从理论和实验两方面研究了两种不互溶液体的密度比和重质液体的粘度对不稳定转速范围的影响。第一章介绍了本课题的研究目的。第二章是相关研究综述。第三章对封闭液体的运动进行了分析。分析了固有频率和模态，并与实验结果进行了比较。第四章在无粘流体的假设下，介绍了作用在转子上的流体力的推导过程。最后提出了解析确定不稳定转速范围的方法。第五章介绍了实验装置和测量技术。第六章将理论计算结果与实验结果进行了比较。第七章简要总结了本项目的成果。