Analysis Of Steady-State Performance And Software Development Of Mechanical Seal In Aviation Field

In addition to the typical features of the fluid mechanical rotor system,the work condition of the aviation field is to bear the high sealing surface relative speed,high environmental temperature,high sealing pressure and the deformation and displacement caused by vibration and other factors.Both in the sealing performance and space structure of the requirements are more stringent to the particularity of the sealing system of aero engine.Considering the specific characteristics of wave spring mechanical seal and magnetic seal,it has important theoretical significance and practical value through the p-V-T-h system analysis method of accurately evaluating performance and life of end face seal and developing integrated software.Based on the finite difference method,the film thickness equation,pressure and temperature distribution equations are derived.The article established dynamic and static pressure theoretical model considering the coning and waviness.The program is compiled by MATLAB software used to calculate the thickness of the fluid film distribution,the pressure and the temperature field.The effects of working conditions,macro structural parameters and microstructure parameters on the sealing performance are studied.Design method based on p-V-T-h,the GUI optimization and analysis software of end face seal structure is developed in aviation field.Load evaluation,seal characteristic analysis,friction properties and wear characteristics analysis are studied of the two kind end seal.The results are shown below.The dynamic pressure has a great influence on the sealing performance parameters,the seal system is more unstable with stronger dynamic pressure.The sealing performance parameters tend to be stable,when coning-waviness ratio >5.The surface morphology has little effect on the temperature rise.When coning-waviness ratio >7,the face maximum temperature tends to be stable.In order to reduce the adverse effect of the high temperature,the large coning-waviness ratio should be chosen in the design of the face seal.The opening force,leakage rate and gas phase volume fraction increase as the speed increases.Besides,the opening force and the volume fraction of the gas volume increased,and the leakage increased first and then decreased with the increase of temperature.Research has shown that negative pressure zone is produced in the lowest pressure area,the distribution of cavitation region has the characteristics of “hysteresis” and “migratory”.The gas produced by the cavitation effect prevents the flow of the fluid,and the maximum amount of leakage and weak cavitation appear at about 70?.