摘要
为了研究空化效应对液膜密封性能的影响,获得最佳的工况参数,建立螺旋槽液膜密封端面三维模型,在引入JFO空化边界条件下利用ANSYS FLUENT14.0对其流场进行数值模拟,考察空化效应时工况参数对开启力、液膜刚度、泄漏量及空化区域变化的影响。结果表明：在本文的参数下,Sommerfeld条件下液膜在厚度1.6μm左右出现最大刚度,JFO条件下刚度在膜厚为1.5-2μm比较稳定,且此时刚漏比出现拐点,最佳膜厚在1.5-2μm;液膜温度在65℃时空化效应最弱;开启力、液膜刚度、泄漏量、空化区域随转速的增加而增大。
A 3D model of spiral groove liquid film seal was established for obtaining the optimum operation condition and studying the effects of cavitation on liquid film seal. The flow field was simulated using JFO cavitation boundary condition based on ANSYS FLUENT14. 0. Considering the effects of cavitation,the influences of operation parameters on opening force,pumping output,stiffness of film and cavitation area were analyzed. Results indicate that the stiffness of liquid film peaks at the thickness of 1. 6 μm under Sommerfeld cavitation boundary condition,while under JFO condition it stabilizes at the thickness of 1. 5- 2 μm,and a inflection point appears on the stiffness-leakage ratio curve,then the stiffness gradually decreases. The optimum thickness is 1. 5- 2 μm considering stiffness and stiffness- leakage ratio. The cavitation has the least effects on the liquid temperature of 65 ℃. In addition,opening force,pumping output,stiffness of film and cavitation area increase with the increase of rotary speed.
出处
《中国石油大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2015年第3期132-137,共6页
Journal of China University of Petroleum(Edition of Natural Science)
基金
国家自然科学基金项目(51375497)
关键词
液膜密封
空化
数值研究
密封性能
liquid film seal
cavitation
numerical study
sealing performance
