旋转配气机构有限元分析

Finite Element Analysis of Rotary Steam-distributing Valves

基于阀体与阀座之间的接触分析,采用热力耦合的有限元方法,对水下航行器旋转配气机构阀体与阀座在复杂位移、力和传热边界条件下的温度场和应力场进行了3D仿真,并且对比了不同阀座材料对温度场和应力场的影响,结果表明,阀体最大应力出现在阀体温度最高、应变最大的进气道部分;阀座最大应力出现在气道孔表面,已接近其许用应力;采用新型浸银炭石墨的阀座材料后能大幅度提高其强度。

Based on the analysis of contact stress between valve body and valve base, the temperature field and stress field of rotary steam-distributing valve for underwater vehicles are simulated by three-dimensional finite element method of thermomechanical coupling under the complicated boundary conditions including displacement, force and heat conduction, and the influences of different valve base materials on the temperature field and stress field are compared. The results show that the biggest stress in the valve body appears at the intake bore where temperature is the highest and strain is the largest; the biggest stress approaching to the allowable value in the valve base is located at the surface of the gas bore; and the strength of the valve base can be largely improved when the new carbon-graphite composite impregnated with silver is adopted as its material.