Numerical simulation on cavitation flow field characteristics of squeeze film damper based on two-phase flow model

A computational fluid dynamics model was established for squeeze film damper with a central feeding groove, based on the Mixture model and the Zwart-Gerber-Belamri vapor cavitation model. The unsteady gas-liquid two-phase flow field in squeeze film damper was simulated by employing the dynamic mesh technique. Numerical simulations showed that with the precession of damper inner ring, two negative-pressure strips were generated in the low-pressure zone of damper symmetrically about the central feeding groove, and there was a high vapor volume fraction in the strips. It demonstrated that pressure distribution in the low-pressure zone and vapor volume fraction were sensitive to position of inlet hole, and variation frequencies of the oil film force and flow field cavitation ratio were closely related to the number of inlet holes. The simulation of the influence of centered precession radius and frequency of inner ring on cavitation flow field shows that the increasing precession radius and frequency both aggravate the cavitation phenomenon, and the phase lag phenomenon of the cavitation ratio becomes more significant.