层板推力室发汗冷却壁温特性的初步研究

对液体火箭发动机发汗冷却层板推力室的壁温特性进行了初步研究,通过建立一维固液耦合温差模型,利用有限体积法,计算得到沿推力室径向层板固体和冷却剂的温度分布,并对影响壁温特性的各种因素进行了计算分析,包括冷却剂流量、层板导热系数和冷却通道尺寸等.结果表明:冷却剂流量是控制层板结构温度的重要参数;层板应该采用一种导热系数适中的材料,过大或过小导热系数的材料都不利于推力室的整体性能;较大的冷却通道宽高比有利于层板向冷却剂导热;冷却通道内的换热效率与冷却剂流量和层板导热系数有关. 

Preliminary study of wall temperature characteristic of a platelet transpiration cooled thrust chamber

The preliminary numerical study of wall temperature characteristic of a platelet transpiration cooled thrust chamber was presented.By establishing a one-dimensional liquid-solid coupling non-equilibrium model and using the finites volume method,the temperature distribution of the platelet solid and the coolant liquid along thickness of the thrust chamber was obtained.Meanwhile,the influence of several factors on the wall temperature characteristic was calculated and analyzed,including the flux of coolant,the conductivity of platelet material and the geometry structure of the cooling channels.The numerical results show that the flux of coolant is the most important parameter of controlling the wall temperature,a platelet material of moderate thermal conductivity shall be chosen;a larger width-depth ratio of cooling channels is conducive to the conduction of the platelet toward the coolant,the thermal exchanging efficiency in the cooling channels correlates with the flux of coolant and the thermal conductivity of platelet material.