双颗粒之间单空泡动力学特性的数值研究  

Simulation Study on Dynamics of Single Cavitation Bubble in Middle of Dual-particles

作　　者：张辉 林泊帆 陈婷 Zhang Hui;Lin Bofan;Chen Ting(School of Optical Information and Energy Engineering,Wuhan Institute of Technology,Wuhan 430205,China)

机构地区：[1]武汉工程大学光电信息与能源工程学院,武汉430205

出　　处：《水动力学研究与进展(A辑)》2024年第6期925-933,共9页Chinese Journal of Hydrodynamics

基　　金：国家自然科学基金(51909195);武汉工程大学研究生创新基金(CX2023264)。

摘　　要：实际流体中,多颗粒的协同作用使得空化破坏问题更加复杂。该文使用流体体积法(VOF)模拟双颗粒之间单个球形空泡的动力学过程,重点研究颗粒间距γ及粒径比δ两个无量纲参数对空泡溃灭形态、微射流及壁面压力的影响。研究结果表明,γ对空泡溃灭射流特征的影响分为三类:空泡朝向颗粒壁面溃灭(γ≤1.00)、空泡朝向泡心溃灭(1.00<γ<2.00)和空泡呈球形溃灭(γ≥2.00)。随着γ的增加,最大射流速度V_(Xmax)和最大壁面压力Pmax总体呈现先增加后减小最后逐渐稳定的趋势。当γ=0.80时,V_(Xmax)达到最大值260 m/s;在γ=0.65时,Pmax达到最大值15.7 MPa;当γ≥1.25时,γ对V_(Xmax)和Pmax的影响不再明显,射流对壁面的影响也可以忽略。δ对空泡溃灭射流特征的影响分为两类:空泡朝向泡心溃灭(δ<0.8)与空泡朝向颗粒壁面溃灭(δ≥0.8)。当δ<0.8时,负向射流速度与壁面压力都相对较小;当δ≥0.8时,随着d的增加,V_(Xmax)先快速增加而后稳定,Pmax先增加后减小;当δ=3.0时,V_(Xmax)可达251 m/s;最大壁面压力出现在δ=1.5时,高达15.9 MPa。In practical engineering,the synergistic effect of multiple particles makes the cavitation-induced damage more serious.Based on the Volume of Fluid(VOF)method,a numerical study is conducted on the dynamic characteristics of a single cavitation bubble in the middle of dual-particles,with emphasis on the influence of dimensionless particle spacingγand particle-bubble size ratioδon the morphology of bubble collapse,micro-jets and wall pressure.The results show that the effect ofγon bubble collapse jet characteristics can be divided into three categories:collapse towards particle wall(γ≤1.00),centripetal collapse(1.00<γ<2.00)and spherical collapse(γ≥2.00).With the increase ofγ,the maximum jet velocity V_(X max)and the maximum wall pressure Pmax generally show a trend of first increasing,then decreasing and finally gradually stabilizing.Whenγ=0.80,the maximum value of V_(X max) V=260 m/s.Atγ=0.65,Pmax reaches a maximum value of 15.7 MPa.Whenγ≥1.25,the influence ofγon V_(X max)and Pmax is no longer obvious,and the influence of bubble collapse on the wall can also be ignored.The effects ofδon bubble collapse jet characteristics are divided into two categories:centripetal collapse(d<0.8)and collapse towards particle wall(d≥0.8).Whenδ<0.8,the negative jet velocity and wall pressure are relatively small.Whend≥0.8,with the increase ofδ,V_(X max)first increases rapidly and then stabilizes,and Pmax first increases and then decreases.Whend=3.0,V_(X max)reaches 251 m/s.The maximum wall pressure appears atd=1.5,up to 15.9 MPa.

关 键 词：单空泡 双颗粒 颗粒间距 粒径比 微射流 

分 类 号：O427.4[理学—声学]