Abstract
Hydrostatic noncontact seals are becoming more widely used as shaft seals for high-pressure water pumps. This work shows that the hydrodynamic pressure head (ρ · u2/2), where ρ is fluid density) should not be ignored in such seals where leakage velocity, u, is high. This “inertia” effect causes a change of pressure profile on the seal surface and affects force equilibrium and the seal separation. Previous work has been reported in Refs. (1) and (3) where the left-hand-side of the following equations has been equated to zero. However, in this paper the fluid inertia effect is added using following equation: In the light of high-pressure seal test results presented here, the analysis including the fluid inertia effect indicates a better correlation than previous analysis neglecting this effect.
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