Abstract:The design idea of dynamichydrostatic hybrid seals was put forward to solve the wear problem of the end face seal in liquid oxygen pump of liquid/oxygen kerosene propellant rocket engine.The key technologies of dynamichydrostatic hybrid seals were studied,and the general selection principles of liquid film seal and gas film seal were given.Based on the numerical calculation method,the influences of static pressure structure parameters on the gas film stiffness and leakage rate were researched.Results show that with the increasing of the diameter of restrictive orifice feed hole,the film stiffness and leakage rate of the seal are increased,the recommended range of the diameter of restrictive orifice feed hole is between 0.2 mm and 0.3 mm.When the pressure equalizing groove depth is changed from 0.1 to 0.5 mm,the film stiffness and leakage rate of the seal are both constant.With the increasing of the pressure equalizing groove width,the film stiffness is decreased,and the leakage rate is increased linearly,the recommended range of the pressure equalizing groove width is between 0.3 mm and 0.6 mm.