微米级圆环缝隙流动与高压强剪切气穴机理研究

项目名称： 微米级圆环缝隙流动与高压强剪切气穴机理研究

项目编号： No.50875234

项目类型： 面上项目

立项/批准年度： 2009

项目学科： 建筑科学

项目作者： 杨华勇

作者单位： 浙江大学

项目金额： 35万元

中文摘要： 针对高速回转液压缸圆环密封缝隙流动具有的微米级结构、轴向大压力梯度、周向强剪切等特点，研究圆环缝隙中高压油液的纯剪切气穴机理，研究在轴向大压力梯度和径向大温度梯度中，低雷诺数流态时的强剪切气穴特性；以液固热几何耦合的数值技术，研究圆环缝隙中的气液二相流动和流体粘性发热规律；考虑液固耦合热传递、缝隙变形和气穴等对流动有重要影响的因素，建立更精确的缝隙流动和流体温升模型。本项目建立微米级圆环缝隙高速回转密封的设计理论，以提高回转液压缸的性能；同时加深对缝隙流动理论的认识，促进其进一步发展。

中文关键词： 缝隙流动；液体气穴；流固耦合

英文摘要： The annuli sealing gap of high speed rotary hydraulic cylinder is microscale. The liquid in the gap flows with large axial pressure gradient and huge circumferential shear. The cavitation mechanism of the hydraulic oil in the annuli sealing gap will be studied under high pressure and pure circumferential shear. The huge shear caused cavitation will be also investigated under large anxial pressure gradient and large radial temperature gradient with low Reynold number. Using numerical solution of liquid-solid conjugate flow, the two phase flow of gap-liquid and the viscous dissipation in the annuli gap will be taken into consideration. More precise models of flow and temperature rise will be developed considering conjugate heat transfer, gap deformation and cavitation. In this project, the design theory of the high speed microscale annuli sealing gap will be improved for a better performance of the rotary hydraulic cylinder.

英文关键词： gap flow; cavitation; wall slip;liqiud-solid conjugate flow