Theoretical and Experimental Comparisons for Damping Coefficients of a Short Length Open-End Squeeze Film Damper
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Squeeze film dampers (SFD) provide load isolation and attenuate rotor vibrations in high speed turbomachinery. Operating parameters such as whirl frequency, amplitude of journal motion and value of external pressure supply determine the SFD dynamic force response and its dissipation of mechanical energy. In this paper, the experimental measurements of pressure fields and fluid film forces in a fully submerged open-end squeeze film damper are presented for tests with rotors speeds up to 5,000 cpm and low supply pressures. The experiments demonstrates the viscous character of the fluid film forces in the SFD test apparatus where fluid inertia effects are minimal (squeeze film Reynolds number less than one). On the other hand, the extent of the cavitation zone appears to be dominant on the generation of fluid forces.
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