海水淡化高压泵水润滑轴承-转子耦合系统瞬态动力特性研究

项目名称： 海水淡化高压泵水润滑轴承-转子耦合系统瞬态动力特性研究

项目编号： No.51276083

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 能源与动力工程

项目作者： 叶晓琰

作者单位： 江苏大学

项目金额： 80万元

中文摘要： 海水淡化高压泵转子系统稳定性问题是万吨级海水淡化工程急需解决的难题之一,研究水润滑轴承-转子耦合系统的动力特性是解决该问题的基础研究。本项目研究内容包括：1）采用有限差分法和有限元法分别研究水膜流场压力分布和转子系统瞬态动力响应，建立水润滑轴承水膜-转子耦合系统数学模型，并分析泵启停过渡过程轴心运动轨迹；2）基于Fluent二次开发和动网格技术，实现启停过程非定常液膜流场数值计算，并测量不同载荷下轴瓦周向瞬态压力分布和轴心运动规律，阐明泵不同工况下的水膜动力传递机理；3）考虑多级叶轮和导叶非定常相干诱导的激振力、转子不平衡和水膜阻尼等因素，基于流固耦合方法研究高压泵转子系统临界转速、模态、涡动轨迹和不平衡响应，并关联分析转子变形条件下水润滑轴承的动力特性。本项目旨在揭示水润滑轴承液膜动力传递机理，掌握水润滑轴承水膜力-转子耦合系统的瞬态动力特性，并建立转子系统滑动轴承润滑状态的判定准则。

中文关键词： 海水淡化高压泵；水润滑轴承；瞬态水膜力；转子动力学；流固耦合

英文摘要： Desalination high-pressure pump rotor system stability is one of the important problems in the large desalination system, and the dynamics of water lubricated bearing and rotor coupled system is the basic study to solve this problem. The contents of this project are as following. 1) The flow field and pressure distribution in water film and transient response of rotor system will be analysed based on the finite difference method and finite element method respectively. The mathematical model of water lubricated bearing water film-rotor system will be established, and the axis trajectory during pump starting and stopping periods will be analysed; 2)The unsteady liquid film flow field will be simulated by the by using Fluent secondary development and moving grid technology.The transient pressure distribution, pressure fluctuation in the circumferential direction of bearing bush and axis movement rules will be measured to clarify the mechanism of water film power transmission during pump starting and stopping processes;3) Considering the exciting force induced by unsteady rotor-stator interaction between multi-stage impellers and guide vanes and rotor unbalance and the water film damping, the dynamic characteristics including rotor critical speed, mode, eddy trajectories and unbalanced response，will be investigated

英文关键词： desalination high-pressure pump；water-lubricated bearing；transient water film force；rotor dynamics；fluid-structure interaction