Finite-length solutions for the rotordynamic coefficients of constant-clearance and convergent-tapered annular seals.
A combined analytical computational method is developed to calculate the pressure field and dynamic coefficients for high pressure annular seals which are typical of neck ring and interstage seals employed in multistage centrifugal pumps. Completely developed turbulent flow is assumed in both the circumferential and axial directions, and is modelled by Hirs' bulk flow turbulent lubrication equations. Linear zeroth and first order perturbation equations are developed for the momentum equations and continuity equation. The development of the circumferential velocity field is defined from the zeroth order circumferential momentum equation, and the nominal pressure leakage relationship results form the zeroth order axial momentum equation. (from authors' abstract)
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