浸没孔液氧气泡动力学数值研究  

Numerical study on bubble dynamics of liquid oxygen at a submerged orifice

作　　者：肖明堃 杨光[1] 黄永华 吴静怡[1] XIAO Mingkun;YANG Guang;HUANG Yonghua;WU Jingyi(School of Mechanical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学机械与动力工程学院,上海200240

出　　处：《化工学报》2023年第S01期87-95,共9页CIESC Journal

基　　金：国家自然科学基金重点项目(51936006)。

摘　　要：液氧是深空探测常用大比冲低温推进剂的重要组成部分,针对液氧气泡动力学的研究非常必要。基于开源CFD软件OpenFOAM,采用CLSVoF法对不同重力水平下从浸没孔生长的液氧气泡进行数值研究。结果表明,重力水平越低,相同无量纲时刻的气泡体积越大,气泡越接近球形。气泡重心在轴向的变化会经历“快-慢-快”三个阶段,但是在高重力水平下第一个阶段不明显。壁面接触角在低重力水平下的变化比高重力水平下更加明显。气泡脱离参数与重力水平呈现明显的次幂定律变化规律。Liquid oxygen is an essential component of high-specific-impulse cryogenic propellant in deep space exploration.Thus it is necessary to study the bubble dynamics of liquid oxygen.In this paper,based on the open source computational fluid dynamics(CFD)software OpenFOAM,the coupled level set and volume of fluid(CLSVoF)method is adopted and the liquid oxygen bubbles growing from a submerged orifice under different gravity levels are numerically investigated.The results show that the lower the gravity level,the larger the bubble volume at the same dimensionless time,and the closer the bubble to sphere.The change of bubble center of gravity in axial direction will go through three stages:fast-slow-fast,but the first stage is not obvious at high gravity levels.The change of wall contact angle is greater at low gravity levels than that at high gravity levels.Moreover,there is a conspicuous power law between bubble detachment parameters and gravity levels.

关 键 词：液氧 流体动力学 气泡 两相流 计算流体力学 

分 类 号：TB611[一般工业技术—制冷工程] TP391.9[自动化与计算机技术—计算机应用技术]