單液滴內(nèi)空化氣泡的生長及潰滅研究
[Abstract]:Supercavitation fuel jet causes cavitation bubbles in some fuel droplets in the spray, and the growth and collapse of cavitation bubbles have an important effect on the splitting and atomization of droplets. The growth and collapse process of cavitation bubbles in fuel droplets under supercavitation conditions were first simulated based on VOF method. It is found that the growth process of cavitation bubbles in a single droplet can be divided into three stages according to the control mechanism: surface tension control stage, integrated competition stage and inertial force control stage. In the first stage, the growth of cavitation is mainly controlled by the surface tension, and the effect of inertia force on the growth of cavitation and the inhibition of viscous force on the growth of cavitation can be neglected. At the stage of II, the growth of cavitation is affected by surface tension, inertia force and viscosity force. The growth rate of cavitation is a kind of inertia force to promote the growth of cavitation and the surface tension and viscosity force to restrain the growth of cavitation. The result of the joint action; In the III stage, the growth of cavitation is mainly controlled by inertial force, and the effects of surface tension and viscosity force on the growth of cavitation can be neglected. The collapse process of cavitation bubbles in a single droplet consists of several collapsing stages and a rebound stage, which is similar to the vibration process of a damped spring oscillator. According to the changing course of bubble radius with time at the end of each collapse cycle, the bubble collapse can be divided into three stages: fast collapse period, slow collapse period and stable phase. The change of cavitation collapse pressure in the initial stage of collapse is very sharp, but the change of cavitation collapse volume is much more gentle, and the change of cavitation rebound pressure with time corresponds to the change of cavitation rebound volume with time.
【作者單位】: 北京交通大學機械與電子控制工程學院;
【基金】:國家自然科學基金(5127601) 國家高技術(shù)研究發(fā)展計劃(2013AA065303) 北京市自然科學基金(3132016) 中國博士后科學基金(2016MS9106) 中央高校基本科研業(yè)務(wù)費專項資金(2016JBM049)資助項目
【分類號】:O35
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