摘要
为研究在轨环境下,热力学排气系统对低温推进剂贮箱的控压性能,采用CFD方法对微重力条件下液氢贮箱内过冷液体喷射过程开展数值模拟研究,对比计算不同喷射区域、喷射流量、喷射速度等因素对箱内物理场分布与压力变化的影响。计算结果表明,低流量流速下,气相区喷射流体无法形成射流,将在喷口处堆积成液团并逐渐积累,降压效果较弱;而液相区喷射几乎没有降压效果。随着流量流速增大,喷射降压效果均有提升。低流量时,气-液相区喷射可以认为是气、液相区单独喷射的叠加,随着流量流速增大,射流对于气、液相区扰动具有交互影响,不再具有叠加性。整体来看,气-液相区喷射降压性能优于单独区域喷射,液相区喷射降压效果最弱。
In order to investigate the pressure control performance of thermodynamic vent system for orbital cryogenic tanks,the CFD method is adopted to simulate the spray process of the subcooled liquid into liquid hydrogen tank under microgravity.Different injection regions,injection fluxes,injection velocities are comparatively calculated and the effects of these factors on physical field distributions and pressure variation are analyzed.The results show:under lower fluxes and velocities,the inlet liquid could not generate jet flow during gas region injection and will accumulate around the spray inlet,which decreases the pressure control efficiency.Meanwhile,the liquid region injection almost has no impact on the tank pressure control under lower fluxes.The effect of spray pressure control increases as the injection flux and velocity for both gas region and liquid region injections.Under lower fluxes,the gas-liquid-region injection process could be regarded as the superposition of separated gas region and liquid region injection processes.As flux increases,this additivity becomes inapplicable since the interaction between the disturbed flow in gas and liquid regions.The gas-liquid-region injection has the best pressure control performance while the liquid region injection has the worst performance.
作者
马原
孙培杰
李鹏
厉彦忠
王磊
MA Yuan;SUN Pei-jie;LI Peng;LI Yan-zhong;WANG Lei(School of Energy and Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China;Shanghai Institute of Aerospace System Engineering,Shanghai 201108,China)
出处
《真空与低温》
2018年第4期266-274,共9页
Vacuum and Cryogenics
关键词
微重力
喷射降压
液氢贮箱
气液分布
压力变化
microgravity
spraying pressure control
liquid hydrogen tank
gas-liquid distribution
pressure change
