基于质量守恒边界条件的螺旋槽旋转密封性能分析  

Performance Analysis of Spiral-groove Rotary Seals Considering Mass Conserving Boundary Condition

作　　者：赵一民[1] 苑士华[1] 胡纪滨[1] 魏超[1] 

机构地区：[1]北京理工大学车辆传动重点实验室,北京100081

出　　处：《机械工程学报》2014年第22期142-149,共8页Journal of Mechanical Engineering

基　　金：国家自然科学基金资助项目(51105031;51175038)

摘　　要：针对车辆传动系统旋转轴转速与工作压力(pv值)不断提高,传统雷诺边界条件不能准确预测螺旋槽旋转密封流体润滑特性的问题。基于Elrod空化算法,求解质量守恒边界条件的稳态Reynolds方程,应用贴体坐标变换生成规则计算网格,采用有限体积法进行数值离散,迭代方法采用Gauss-Seidel松弛迭代,分析螺旋槽结构参数对旋转密封性能的影响。结果表明:相比于雷诺边界条件,在高pv值工况下质量守恒边界条件预测的密封泄漏量与试验结果更接近;槽数、槽深比与螺旋角等螺旋槽结构参数对旋转密封性能影响显著,选择合适的结构参数能改善旋转密封的开启性、稳定性、经济性与密封性;旋转密封螺旋槽的结构优选值范围如下:槽数为10~12,周向槽台比为0.5~0.7,径向槽台比为0.5~0.6,槽深比为1.4~1.5,螺旋角为27o^30o。For the increase of shaft speed and operating pressure（pv value） in vehicle transmission system, traditional Reynolds boundary condition cannot solve the problem of accurately predicting the hydrodynamic performance of spiral-groove rotary seals.Based on Elrod＇s cavitation algorithm, the Reynolds equation under steady state is solved with the mass conserving boundary condition. By using the boundary fitted coordinate system transformation, regular computational domain is generated. Reynolds equation is discretized by finite volume method and solved by Gauss-Seidel relaxation iteration. The effects of structural parameters of spiral grooves on seal performance are analyzed. The results indicate that, compared to Reynolds boundary condition, in high pv value conditions the leakage predicted by mass conserving boundary condition is more agreeable with experimental results.Structural parameters, such as the number of grooves, film thickness ratio, spiral angle, etc., have significant influence on performance of rotary seal. Appropriate structural parameters will improve opening characteristics, stability, economy and tightness of rotary seal rings. The range of optimized structural values of spiral grooves： number of grooves 10-12, groove width ratio 0.5-0.7,radial seal dam extent 0.5-0.6, groove depth ratio 1.4-1.5, spiral angle 27o-30 o.

关 键 词：螺旋槽旋转密封 质量守恒边界条件 空化 

分 类 号：TB42[一般工业技术]