FINITE-LENGTH SOLUTIONS FOR THE ROTORDYNAMIC COEFFICIENTS OF CONSTANT-CLEARANCE AND CONVERGENT-TAPERED ANNULAR SEALS.
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A 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 modeled by Hirs' bulk-flow turbulent-lubrication equations. Experimental results are presented for four annular seals. The test results show that leakage increases and damping decreases as the taper angle is increased. However, contrary to theoretical predictions, the direct stiffness remains relatively constant as the taper angle increases.
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