Abstract
A new dynamic model is developed for the dual clearance squeeze film damper (DCSFD) considering the effect of cavitation in this paper. The relationship between the eccentricities of the inner and outer films is achieved based on the equations of motion. The Reynolds equation and Rayleigh–Plesset equation are employed to describe the kinetic properties of DCSFD and the cavitation effect of film, respectively. Under the assumption of compressible fluid, the pressure distribution of DCSFD is finally obtained by the numerically iterative method. The film pressure distribution in the outer layer (including the positive and negative pressure zones) obtained from the experimental test agrees well with the numerical prediction, which verifies the validity of the proposed numerical model. In Section 5, the effects of oil temperature, inlet pressure, eccentricity, and whirling frequency on the cavitation in the film are investigated systematically and experimentally. The experimental results indicate that cavitation mainly affect the pressure in the negative pressure zone of the inner and outer film of DCSFD, but has little influence on the pressure in the positive pressure zone. The area of cavitation increased with eccentricity; when the inner eccentricity reached 0.1 or above, the area near the injection hole of film also generated a small zone of negative pressure. The numerical model and the experimental results in this paper are valuable for further research and engineering applications of DCSFD.
Highlights
A new dynamic model is developed for the dual clearance squeeze film damper (DCSFD) considering the effect of cavitation in this paper. e relationship between the eccentricities of the inner and outer films is achieved based on the equations of motion. e Reynolds equation and Rayleigh–Plesset equation are employed to describe the kinetic properties of DCSFD and the cavitation effect of film, respectively
Under the assumption of compressible fluid, the pressure distribution of DCSFD is obtained by the numerically iterative method. e film pressure distribution in the outer layer obtained from the experimental test agrees well with the numerical prediction, which verifies the validity of the proposed numerical model
A dynamic numerical model is developed for the DCSFD considering the effect of cavitation. e DCSFD model and cavitation model are solved simultaneously to obtain final pressure distribution of the inner and outer film
Summary
Ere is a phase difference between the journal and the floating ring and the eccentricity of the inner and outer film is not the same. In order to determine the pressure distribution of the inner film, it is necessary to obtain the relative eccentricity first. To obtain the inner and outer film forces of the DCSFD, we need to model their pressure distributions. It results in the increase of the flow rates and decrease of the film pressure. E Reynolds equations of the inner and outer film of DCSFD are given in equations (6) and (7): It results in the increase of the flow rates and decrease of the film pressure. e Reynolds equations of the inner and outer film of DCSFD are given in equations (6) and (7):
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