通孔平板附近空化泡动力学特性数值模拟研究OA北大核心CSTPCD

The effectiveness of cavitation cleaning process is closely linked to the ratio of the distance between a cavitation bubble and the orifice plate to its maximum radius in this process.However,most of the previous studies on cavitation bubble dynamics in the vicinity of a through-hole flat plate were limited to the factors such as morphology and jet direction,with little attention given to jet strength or evolutionary period.In this work,a two-phase compressible cavitation bubble dynamics model is used to study the multi-period evolution dynamics of cavitation bubbles near a flat plate with a through-hole,based on the open source fluid dynamics code OpenFOAM.Simulation results reveal that the maximum velocity of the liquid jet,formed by cavitation bubble collapsing,decreases as the distance parameter γ increases when it reaches the center of the hole.As the size parameter ε decreases,this liquid jet's maximum velocity at the hole's center increases.And,with a decrease in γ or ε,the minimum radius of a cavitation bubble at its first collapse increases gradually,the intensity of bubble collapsing slows down,and the time period of the first collapse is prolonged.