摘要
为测量O形密封圈应用在负压油介质环境中的密封泄漏率,构建了一套求解O形密封圈泄漏率的数值仿真算法,并辅以实验进行验证。利用真实表面形貌进行分区处理用于匹配接触压力分布,进而利用接触状态矩阵生成泄漏通道来模拟真实泄漏状况,通过观察泄漏通道的有无来判定密封是否泄漏,同时对平行平板泄漏模型进行改进使其适用于不同通道截面形状的泄漏率计算。对不同油压下的O形圈密封泄漏率进行计算,结果表明:当流体介质压力为0.07 MPa时,仿真所得密封泄漏率为1.717×10^(-12)m^(3)/s;当介质压力增大至0.09 MPa时,仿真所得密封泄漏率下降为1.525×10^(-12)m^(3)/s。比较不同介质压力下的接触应力分布,结果表明:随流体介质压力增加,密封接触区域接触应力分布增大,形成贯穿密封接触区域的泄漏通道范围减小,泄漏率减小。为验证仿真结果的合理性,将仿真结果与实验结果进行对比,结果表明:两者相对误差在10%左右,实验结果与仿真结果相符程度较好。
This paper proposes a set of numerical simulation algorithms to measure the leakage rate of O-ring in negative pressure oil medium.To be specific,a partition algorithm based on real surface topography is first used to match the contact pressure distribution.Then a contact state matrix is used to generate leak paths to simulate real conditions and determine seal leakage.Moreover,the parallel plate leak model is improved to make it applicable to the calculation of leakage rate of channel cross sections in different shapes.The leakage rates of the O-ring under different oil pressures are calculated.According to the results,when the fluid medium pressure is 0.07 MPa,the seal leakage rate obtained by simulation is 1.717×10^(-12)m^(3)/s;when the fluid medium pressure increases to 0.09 MPa,the seal leakage rate obtained by simulation decreases to 1.525×10^(-12)m^(3)/s.The contact stress distributions under different medium pressures are compared.According to the results,with the increase of fluid medium pressure,the contact stress distribution in the seal contact area increases,the leakage paths formed through the sealing contact area decreases and the leakage rate drops.Finally,the simulation results are compared with the experimental results to verify their rationality.The results show that the relative error is about 10%,and the experimental results are in good agreement with the simulation results.
作者
和建森
翟黎明
饶聪
黄毅杰
郭飞
HE Jiansen;ZHAI Liming;RAO Cong;HUANG Yijie;GUO Fei(Aeronautical Engineering Institute,Civil Aviation University of China,Tianjin 300300,China;State Key Laboratory of Tribology,Tsinghua University,Beijing 100084,China;Engine Business Department of FAW Jiefang Automobile Co.,Ltd.,Wuxi,Jiangsu 214000,China)
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2022年第12期46-55,共10页
Journal of Xi'an Jiaotong University
基金
国家自然科学基金资助项目(U1937602)
航空科学基金资助项目(201907058001)。
