气枕压力对液氢贮箱热分层的影响规律  

Influence rule of tank pressure on thermal stratification in liquid hydrogen tank

作　　者：王磊[1] 厉彦忠[1] 程向华[1] 

机构地区：[1]西安交通大学能源与动力工程学院,西安710049

出　　处：《低温工程》2009年第6期18-22,45,共6页Cryogenics

基　　金：教育部高等学校博士学科点专项科研基金(20060698021)

摘　　要：采用CFD技术,对不同气枕压力下液氢贮箱内部物理场进行数值模拟,选择Boussinesq模型解决浮升力的影响。研究表明:气枕压力会对贮箱内部温度场与速度场产生重要影响。箱内流场随气枕压力的增大而明显减弱;气枕压力越大,贮箱顶部与底部区液氢温度越高,而压力对中部区液氢温度的影响随时间发生变化;在近壁区,热边界层厚度及温度分布受气枕压力影响较弱;边界层速度最大值及出现位置均随气枕压力的升高而降低。A numerical study was performed for the influence of different liquid hydrogen tank pressure on physical field inside the tank based on CFD technique. Meanwhile, Boussinesq model was applied to solve the effect of buoyancy force. The results show that tank pressure plays an important role in the temperature distributions and velocity fields inside the tank. As the tank pressure increases, the velocity fields will be suppressed, and liquid hydrogen temperature both in the upper and lower regions of bulk rises corre- spondingly, while the influence of tank pressure on liquid hydrogen temperature in the middle of bulk changes with time. In the near/wall region, tank pressure has little effect on the thickness of thermal boundary layer and temperature distribution. Moreover, the maximum velocity in the boundary layer decreases as tank pressure increases, and the position of the maximum velocity also reduces.

关 键 词：增压 液体火箭 液氢 热分层 

分 类 号：TB612[一般工业技术—制冷工程]