Research on Flow State Evolution and Static Performance of Smooth Annular Liquid Seals
The static stiffness coefficient of the smooth annular seal directly affect the rotor system stability.To explore the static instability mechanism and the factors affecting smooth annular liquid seals,a smooth annular liquid seal model was established using computational fluid dynamics method,and the flow characteristics of the seal at various eccentrici-ties,inlet and outlet pressures,and rotational speeds under different flow conditions(laminar,transition,and turbulent flow).Results show that the static direct stiffness from laminar to transition flow state first decreases and then increases,and the viscosity effect is the dominant factor.In transition and turbulent flow,the viscous and inertial effect produce nega-tive fluid-induced force and negative static stiffness coefficient under high eccentricity ratios.The static stability of the seal decreases as the Reynolds number increases.
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