Experimentl Analysis of Cavitation Disappearance Phenomenon in High Shear Flow Field with Micro Clearance Between Two-dimensional Piston/Cylinder Pair
The characteristics of the surface sealing and circumferential rotational flow of two-dimensional pistons can be fully utilized by two-dimensional hydraulic components to obtain better operating performance,but they still face the cavitation phenomenon caused by the strong shearing of oil in the gap between the two-dimensional piston and the cylinders.While investigating the shear cavitation,it is found that the cavitation bubbles not only grow over time,but also shrink and disappear under specific conditions.To investigate the causes of cavitation bubbles extinction,a fully developed cavitation bubble distribution field was constructed in a pure shear flow field using a shear rheology device with a transparent and rotating outer cylinder,which conducts visual experimental research on varying temperatures,fluid pressures,air content above the shearing fluid filed,and stator external surface structure.The experimental results demonstrate that the cavitation bubble disappearance phenomenon differs from the cavitation collapse phenomenon,besides its initial disappearance is positively correlated with the rising temperature of the oil and the fluid pressure,with the latter being more crucial.The cavitation bubbles extinction time is exponentially dropping correlated with the initial pressure of the flow field.The shorter the shear cavitation extinction time in the short groove flow field,the higher the pressure and the smaller the temperature rise.
hydraulic componentstwo-dimensional pistonmicro clearancecavitation disappearanceexperimental study
万方数据
