浸没孔液氧气泡动力学数值研究

doi:10.11949/0438-1157.20221610

摘要/Abstract

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。

关键词: 液氧, 流体动力学, 气泡, 两相流, 计算流体力学

Abstract:

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.

Key words: liquid oxygen, hydrodynamics, bubble, two-phase flow, computational fluid dynamics

中图分类号:

TB 61⁺1

肖明堃, 杨光, 黄永华, 吴静怡. 浸没孔液氧气泡动力学数值研究[J]. 化工学报, 2023, 74(S1): 87-95.

Mingkun XIAO, Guang YANG, Yonghua HUANG, Jingyi WU. Numerical study on bubble dynamics of liquid oxygen at a submerged orifice[J]. CIESC Journal, 2023, 74(S1): 87-95.

图/表 10

图1 浸没孔气泡生长示意图

Fig.1 Schematic diagram of bubble growth at submerged orifice

表1 低温流体在0.1 MPa时的物性［20］

Table 1 Physical properties of cryogenic fluids at 0.1 MPa［20］

90.062

13.205

表2 不同星球重力水平［18-19］

Table 2 Values of gravitational acceleration at different planets［18-19］

星球	重力水平g/(m/s²)
木星	24.8
地球	9.81
火星	3.71
月球	1.64
冥王星	0.58

图2 g = 1.64 m/s2下网格无关性验证结果

Fig.2 Mesh independence study at g = 1.64 m/s2

图3 不同重力水平下气泡从浸没孔生长的演化过程

Fig.3 Evolution of bubbles from submerged orifice under different gravity levels

图4 不同重力水平下气泡“颈部”位置的变化

Fig.4 Changes in the position of bubble “neck” at different gravitational accelerations

图5 不同重力水平下气泡的重心位置随时间的变化

Fig.5 Changes in the position of bubble center of gravity at different gravitational accelerations

图6 不同重力水平下气泡与壁面瞬态接触角随时间的变化

Fig.6 Changes in the instantaneous contact angle at the wall under different gravity levels

图7 气泡脱离参数与重力水平的关系

Fig.7 Relationship between bubble detachment parameters and gravitational accelerations

表3 不同气泡脱离参数次幂定律常数与R2值

Table 3 Values of constant and R2 in power law for different bubble detachment parameters

气泡脱离参数	次幂定律参数n	拟合曲线R²值
t_det	-0.944	0.991
V_det	-0.889	0.998
z_CG,det	-0.278	0.945

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