梳齿密封和圆孔型阻尼密封结构强度分析

Structural strength analysis of labyrinth seal and hole-pattern seal

针对某型号火箭发动机氢涡轮泵多次出现异常振动的问题,拟用孔型阻尼密封代替原有梳齿密封。采用ANSYS有限元建模方法对2种密封结构强度进行校核和对比分析,研究了不同结构参数对孔型密封强度的影响规律。结果表明:孔型密封相对梳齿密封而言,结构最大应力强度稍大,但在许用应力以下,且结构最大变形量较小;孔型密封周向50孔时前、后密封的最大应力强度、最大变形量相对于周向80孔密封结构小;随着密封孔深的增加,孔型密封结构的最大应力强度、最大变形随之增大;根据第三强度理论设计的孔型阻尼密封满足实际工程需求。

To solve the abnormal vibration problem of hydrogen turbopump in rocket engine,hole-pattern seal was intended to replace labyrinth seal.Using finite element modeling method,structural strength of the two seals were analyzed and the influence of different structural parameters on hole-pattern seal was studied.Results show that the maximum stress intensity of hole-pattern seal is bigger than that of labyrinth seal,but is still under the allowable stress and the maximum deformation is smaller.In addition,the maximum stress intensity and maximum deformation of hole-pattern seals with 50 holes are smaller than the seal with 80 holes.And both the maximum stress intensity and maximum deformation increase with the increasing of the hole depth.The hole-pattern seal designed according to the 3rd strength theory meets the demand of practical engineering.