In this paper,the oscillatory oil squeeze film is taken as a research object,and a coupled cavitation model based on the theory of bubble dynamics and hydrodynamic lubrication is used and a specific method of numerica...In this paper,the oscillatory oil squeeze film is taken as a research object,and a coupled cavitation model based on the theory of bubble dynamics and hydrodynamic lubrication is used and a specific method of numerical calculation is given.Then the parallel-plate squeeze film test apparatus is used to validate the coupled cavitation model.The pictures of the cavitation were captured by a high-speed camera and then processed to obtain the variation of the cavitation area in experiments.Compared with the experimental results,the model can successfully predict the process of generation and development of cavitation.At the same time,the pressure variation calculated by the model is in good agreement with the experimental data and the value of negative pressure is close to the experiment.On this basis,three new parameters that are related to bubble dynamics are studied by comparing the pressure and cavitation area variation in an oscillating squeeze oil film.The results show that surface dilatational viscosity,initial radii of cavitation nuclei and number of bubbles per unit area have a significant influence on the generation time of the cavitation,the maximum tensile stress that the oil film can withstand,and the speed of the cavitation collapse respectively.展开更多
基金support from Ford motor company,under Ford University Project 2014-2175R.
文摘In this paper,the oscillatory oil squeeze film is taken as a research object,and a coupled cavitation model based on the theory of bubble dynamics and hydrodynamic lubrication is used and a specific method of numerical calculation is given.Then the parallel-plate squeeze film test apparatus is used to validate the coupled cavitation model.The pictures of the cavitation were captured by a high-speed camera and then processed to obtain the variation of the cavitation area in experiments.Compared with the experimental results,the model can successfully predict the process of generation and development of cavitation.At the same time,the pressure variation calculated by the model is in good agreement with the experimental data and the value of negative pressure is close to the experiment.On this basis,three new parameters that are related to bubble dynamics are studied by comparing the pressure and cavitation area variation in an oscillating squeeze oil film.The results show that surface dilatational viscosity,initial radii of cavitation nuclei and number of bubbles per unit area have a significant influence on the generation time of the cavitation,the maximum tensile stress that the oil film can withstand,and the speed of the cavitation collapse respectively.
