晃荡条件下气泡上升速度特性研究  

Study on the characteristics of single bubble rising velocity under sloshing conditions

作　　者：宋禹林 谭思超 付学宽 李小辉[2] 

机构地区：[1]哈尔滨工程大学核安全与仿真技术国防重点学科实验室,黑龙江哈尔滨150001 [2]中国舰船研究设计中心,湖北武汉430064

出　　处：《哈尔滨工程大学学报》2015年第6期865-870,共6页Journal of Harbin Engineering University

基　　金：黑龙江省青年学术骨干支持计划资助项目(1254G017);核安全与仿真技术国防重点学科实验室基金资助项目(HEUFN1305)

摘　　要：海浪、地震等条件都会导致核动力设备中储存自由液面的设备产生剧烈的晃荡。为了分析晃荡条件下液体中的气泡行为特性,本文运用CLSVOF(coupled level-set and volume-of-fluid)模型追踪两相流体交界面,数值模拟气泡在液体中受余弦简谐激励和自由液面影响的上升过程。计算结果显示余弦简谐激励降低了气泡纵向运动速度,而横向速度略大于激励速度;自由液面的波动在纵向上会使气泡上升速度骤然降低,甚至出现负速度,越接近自由液面横向速度峰值越大。计算结果表明晃荡运动的影响是余弦简谐激励与自由液面波动影响的叠加,晃荡条件下自由液面波动是气泡速度变化的主要因素,气泡的本身属性起次要作用。Ocean waves and seismic waves can cause violently sloshing of the free liquid surface in a container. In order to analyze the behavior of rising bubble in liquid under the condition of sloshing,this paper uses the CLSVOF（ coupled level-set the volume-and-fluid） model to simulate the two-phase fluid interface,obtaining the rising bubble in the liquid with cosine harmonic excitation condition or wave of free surface condition. Calculation results show that cosine harmonic excitation reduces the bubble longitudinal velocity transverse velocity is slightly bigger than the motivation speed and the wave of free surface will make the bubble rising velocity plummet and even lead to negative speed. The lateral velocity peak increases gradually closer to the free surface. Calculation results prove that sloshing is the outcome of superposition with cosine harmonic excitation and wave of free surface and the density difference between air and water is one of the driving forces of bubble motion. In sloshing condition,fluctuation of free surface is the main factor of changes in bubble velocity,which proved that the attribute of bubble is the weakest factor.

关 键 词：上升气泡 晃荡 CLSVOF 大空间 

分 类 号：TL334[核科学技术—核技术及应用]