Numerical analysis on performance of hydrodynamic-hydrostatic hybrid mechanical seals for turbopumps
In view of the characteristics of low dynamic viscosity and hard film forming of liquid oxygen on the sealing face,a hydrodynamic-hydrostatic hybrid mechanical seal was proposed.Considering the hydrostatic effect of the orifice and the cavitation effect of the liquid film,the finite element analysis model of the liquid film was established to study the working principle of the hydrodynamic-hydrostatic hybrid mechanical seal and analyze the influences of the geometrical parameters of the hydrodynamic and hydrostatic structure on the sealing performance.Within the research scope,the optimum range of the geometrical parameters of the spiral groove and hydrostatic structure was as follows:the groove-weir ratio was 0.6-0.7,the groove-dam ratio was 0.6-0.7,the groove depth was 12-15 pm,the spiral angle was 15°-18°,the orifice diameter was 0.4-0.5 mm,and the orifice number was 6-12.
hydrodynamic-hydrostatic hybrid mechanical sealliquid oxygenfinite element methodorificeturbopump
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