液体火箭发动机推力室冷却通道温度分层数值研究

Numerical investigations of thermal stratification in cooling channel of liquid rocket engine thrust chamber

为了研究冷却剂温度分层的形成机理及其对流动和换热的影响,应用雷诺应力模型(RSM)对液体火箭发动机推力室再生冷却通道的流动与传热进行了三维数值模拟,冷却剂为气氢,考虑其物性随温度和压力的变化.所得结果表明:冷却剂在非流动方向会出现温度分层现象,随着冷却剂的不断受热,温度分层现象越明显,由于喉部二次流加强了冷却剂间的混合,在喉部区域温度分层被减弱,温度分层对冷却剂温升及压降影响较小,严重影响气壁温度的估算.

To study the formation mechanism of thermal stratification in cooling channel and its effects on the flow and heat transfer,three dimensional turbulent fluid flow and heat transfer in a regenerative-cooling channel of liquid rocket engine were numerically investigated with Reynolds stress model(RSM) model,and the coolant was hydrogen,whose thermophysical properties varied with both temperature and pressure.The results show that thermal stratification occurs at non-flow direction,the extent of thermal strati...