Experimental study of a grooved squeeze film dampe
Date
1993
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Texas A&M University
Abstract
An experimental study of the force response of a grooved short Squeeze Film Damper executing circular centered orbits is carried out. Fluid film forces generated by the fluid at the film lands and at the circumferential groove are determined from measurements of the dynamic pressure field for different conditions of journal whirl frequency and orbit radius, as well as for different groove dimensions. Significant levels of dynamic pressure are found in the circumferential groove, particularly for damper configurations with small groove depths. This contradicts the assumption made in the classical lubrication theory that the groove acts as a large pressure sink where no dynamic pressure is generated. Radial and tangential fluid film forces developed at the groove are found to be important when compared to the forces generated at the film land. Radial forces of the same level as those developed at the groove are determined at the film land where the film thickness is considerably smaller. Therefore, the groove induces an inertia like effect into the film land. The groove fluid phenomena generates a dynamic pressure at the groove due to the journal motion. This pressure not only produces significant fluid film forces at the groove, but it also induces a dynamic pressure field at the land larger than that predicted by the classical theory. The effect of the groove is significant for dampers with groove depths up to ten times the radial clearance. An analytical model that considers the fluid at the groove as slightly compressible and that includes the effect of the circumferential flow at the groove is presented. The model is developed for an uncavitated short open damper with small amplitude journal motions. The model shows good qualitative and quantitative agreement with the experimental results for all the damper configurations tested and when no fluid cavitation occurs.
Description
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Includes bibliographical references.
Includes bibliographical references.
Keywords
mechanical engineering., Major mechanical engineering.