Abstract
The circumferential-groove seal is commonly used in various turbopumps to reduce leakage. The main goal of this paper is to develop the method of three-dimensional CFD analysis for determining leakage and rotordynamic coefficients of the circumferential-groove-pump seal. A relative coordinate system was defined for steady-state simulation to calculate the velocity and pressure distributions of the seal clearance at each rotor whirl speed. Instead of setting the inlet and outlet pressures as the boundary conditions in the three-dimensional CFD analysis, as it is more commonly done, we used the inlet velocity and outlet pressure obtained from a preliminary two-dimensional CFD analysis. For prediction leakage, the presented analysis shows improvement from the bulk-flow model analysis. For the prediction of rotordynamic coefficients of K, k and C, the presented analysis provides results in closer agreement with the experimental values than those of the bulk-flow model analysis at several rotor speeds.
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Recommended by Associate Editor Hyoung-gwon Choi
Tae Woong Ha received his Ph.D. degree in Mechanical Engineering from the Texas A&M university in 1992. He has been working at Gachon University (Korea) since 1993. His research interests are in the areas of seal analysis and rotordynamics.
Sung Ho Kim received his M.S. degree in Mechanical Engineering from the Gachon University (Korea) in 2015. His research interest is in the area of CFD analysis.
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Kim, S.H., Ha, T.W. Prediction of leakage and rotordynamic coefficients for the circumferential-groove-pump seal using CFD analysis. J Mech Sci Technol 30, 2037–2043 (2016). https://doi.org/10.1007/s12206-016-0410-4
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DOI: https://doi.org/10.1007/s12206-016-0410-4