考虑法兰变形的U-E金属密封结构匹配优化设计  

Matching optimization design of U-E metal seal structure considering flange deformation

作　　者：王晨威 闫方琦 李智军[1] 常涛[1] 陈建华[1] WANG Chenwei;YAN Fangqi;LI Zhijun;CHANG Tao;CHEN Jianhua(Xi'an Aerospace Propulsion Institute,Xi'an 710100,China)

机构地区：[1]西安航天动力研究所,陕西西安710100

出　　处：《火箭推进》2023年第3期115-122,共8页Journal of Rocket Propulsion

基　　金：国家自然科学基金项目(11702204)。

摘　　要：针对液体火箭发动机大直径高温高压轻量化法兰变形量大导致密封泄漏的问题,采用Walters法结合三维仿真实验对法兰变形进行分析,阐明了法兰变形量及U-E金属主/副密封面密封比压变化,通过法兰变形量对U-E主/副密封之间的高度进行匹配设计;对于U-E密封复杂横截面多结构参数,设计正交实验,结合法兰变形量,系统开展了U-E金属主/副密封设计。结果表明:法兰变形导致压缩量减小,密封回弹量增大,可导致U-E结构的密封比压不足;通过增加压缩量,增加U-E主/副密封高度差,U-E密封正交试验的结构优化,有效地解决了法兰变形下的密封比压不足问题。对优化后的结构进行重复充泄压试验,试验结果均满足要求。Aiming at the seal leakage problem of liquid rocket engine caused by large diameter flange deflection,high temperature and high pressure,the flange deformation was analyzed and the specific-pressure of the U-E metal seal was illustrated by employing the Walters method and virtual simulation experiment.Further,the match of main and secondary height of U-E seal was designed.On this basis,the cross-section of U-E seal was optimized by orthogonal experiment with the obtained flange deformation.The results show that the seal reduction decreases and the springback increases caused by flange deflection;the specific-pressure of present U-E seal is not appropriate and is improved with the method of both increasing seal compression and the height difference of the main and secondary seal,as well as implementing the structure optimization of seal by orthogonal experiment.The optimized structure is tested and validated.

关 键 词：金属密封 法兰变形 密封比压 匹配优化 

分 类 号：V261.34[航空宇航科学与技术—航空宇航制造工程]