Numerical analysis of bubble dynamics in the diffuser of a jet pump under variable ambient pressure  

作　　者：龙新平 王晴晴 肖龙洲 章君强 徐茂森 吴伟烽 季斌 

机构地区：[1]State Key Laboratory of Water Resources and Hydropower Engineering Science,School of Power and MechanicaI Engineering,Wuhan University,Wuhan 430072,China [2]Hubei Key Laboratory of Waterjet Theory and New Technology,Wuhan University,Wuhan 430072,China [3]School of Energy and Power,Xi'an Jiaotong University,Xi'an 710049,China

出　　处：《Journal of Hydrodynamics》2017年第3期510-519,共10页水动力学研究与进展B辑（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.11472197,51679169 and 51109174);the Fundamental Research Funds for the Central Universities(Grant No.2042016gf0032)

摘　　要：Recent studies have shown that the collapse of cavitation bubbles in a jet pump can generate an extremely high pressure with many potential applications. The dynamics of the bubble is governed by the Rayleigh-Plesset equation. With the bubble dynamics equation and the heat and mass transfer model solved with the Runge-Kutta fourth order adaptive step size method, the oscillations of the bubble in the diffuser of the jet pump are assessed under varied conditions. To obtain the pressure variation along the diffuser, the Bernoulli equation and the pressure measured in experiment are coupled. The results of simulation show that a transient motion of the bubbles can be obtained in the diffuser quantitatively, to obtain the pressure and temperature shock in the bubble. Moreover, increasing the outlet pressure coefficient would result in a more intense bubble collapsing process, which can be used in the subsequent studies of the cavitation applications. The predictions are compared with experiments with good agreement.Recent studies have shown that the collapse of cavitation bubbles in a jet pump can generate an extremely high pressure with many potential applications. The dynamics of the bubble is governed by the Rayleigh-Plesset equation. With the bubble dynamics equation and the heat and mass transfer model solved with the Runge-Kutta fourth order adaptive step size method, the oscillations of the bubble in the diffuser of the jet pump are assessed under varied conditions. To obtain the pressure variation along the diffuser, the Bernoulli equation and the pressure measured in experiment are coupled. The results of simulation show that a transient motion of the bubbles can be obtained in the diffuser quantitatively, to obtain the pressure and temperature shock in the bubble. Moreover, increasing the outlet pressure coefficient would result in a more intense bubble collapsing process, which can be used in the subsequent studies of the cavitation applications. The predictions are compared with experiments with good agreement.

关 键 词：Cavitation jet pump bubble collapse 

分 类 号：O35[理学—流体力学] TH38[理学—力学]