石墨圆周密封热-结构耦合分析

Analysis on thermal-structure coupling for graphite circumferential seal

综合考虑作用于石墨圆周密封环机械载荷和温度载荷,利用软件ANSYS完成石墨圆周密封结构分析、稳态热分析和热-结构耦合分析。结果表明:石墨圆周密封环主密封面应力分布均匀,最大等效应力出现在接头搭接处,这是由于接头搭接处结构特点,使密封环在此处所受气体不平衡力较大引起的。辅助密封面受载荷力矩作用引起应力分布不均,导致不平行密封缝隙出现,影响密封性能。密封环温度场分布均匀,主密封面的温度高于辅助密封面,接头搭接处接触面积大,温度显著升高。热效应对石墨圆周密封性能影响不容忽视,考虑热效应作用时,密封环应力值产生了一个数量级的升高,并使最大应力区域自主密封面接头边缘处向中心附近移动。

The mechanical load and temperature load on the graphite circumferential seal ring were considered comprehensively,and the software ANSYS was utilized to complete the structure analysis,steady-thermal analysis and thermal-structure coupling analysis of graphite circumferential seal ring.Results showed that stress distribution was uniform on the main sealing surface of graphite circumferential seal ring,the maximum equivalent stress appeared in lapping area of joints,becasue the structural characteristics of joints made gas unbalanced force higher in the lapping area of joints.The stress distribution was nonuniform on the auxiliary sealing surface because of the action of the load torque,and affected the sealing performance.Temperature field distribution was uniform,and the main sealing surface temperature was higher than the temperature on auxiliary sealing surface,and temperature had a significant rise in the lapping area of joints due to large contact area.Thermal effect should not be ignored for the properties of graphite circumferential seal.The value of stress had a tenfold rise in consider-ation of the thermal effect,and made the largest stress area move from edge to the center.