Experimental and simulation studies on critical cavitation pressure of oily medium

Abstract

In order to control the cavitation generated by oily medium, the advantage of mechanical production brought by cavitation is better utilized, and the mechanical damage of parts caused by cavitation is avoided, it is concluded that the cavitation pressure of lubricating oil of oily medium. The pressure field, streamline diagram and cavitation phase diagram were obtained by Ansys Fluent numerical calculation of the oily medium in the flow field of expanding region, the analysis of the mechanism of cavitation. The test bench of cavitation jet is designed, and verified with the simulation results, the specific value of critical pressure of lubricating oil cavitation under different apertures is obtained, and collected cavitation images. The pressure field decreases from the pressure inlet to the outlet, the cavitation occurs in the vicinity of the low pressure zone and the high pressure zone. When the diameter of the jet hole becomes larger, the cavitation occurs more difficult. The lower the viscosity of the lubricating oil, the higher the temperature, the occurrence of cavitation requires higher pressure to stimulate.