燃烧室内壁面发汗冷却数值模拟研究  

Numerical simulation research on transpiration cooling on the inner wall of combustion chamber

作　　者：刘学 杨海威 周伟星[2] LIU Xue;YANG Haiwei;ZHOU Weixing(College of Aerospace and Civil Engineering,Harbin Engineering University,Harbin 150001,China;School of Energy Science and Engineering,Harbin Institute of Technology,Harbin 150001,China)

机构地区：[1]哈尔滨工程大学航天与建筑工程学院,黑龙江哈尔滨150001 [2]哈尔滨工业大学能源科学与工程学院,黑龙江哈尔滨150001

出　　处：《火箭推进》2021年第4期30-36,共7页Journal of Rocket Propulsion

基　　金：国家自然科学基金(51676056)。

摘　　要：燃烧室内的高热流会使得燃烧室内壁面因烧蚀而破坏,发汗冷却作为一种先进的冷却技术可用作燃烧室内壁面的热防护过程中。通过平板发汗冷却模型研究了发动机燃烧室内壁面在不同热流密度下温度分布,结果显示随着热流密度的增大,壁面温度线性上升。通过研究多孔介质几何结构对发汗冷却效果的影响,发现在保持其他变量不变的条件下,孔隙率与孔径的增大均会导致固体壁面温度的上升,不利于固体壁面的保护。模拟结果表明,冷却工质流量的增大使得热端壁面温度快速下降,即使增加微小的流量也会起到明显的降温效果,热壁面温度与冷却剂流量符合幂函数关系,相关度较高。The high heat flux in the combustion chamber will damage the walls in the combustion chamber due to ablation.As an advanced cooling technology,transpiration cooling can be used in the process of thermal protection of the walls in the combustion chamber.In this paper,the plate transpiration cooling model was used to study the temperature distribution of the wall in the engine combustion chamber at different heat flux conditions.The results show that the wall temperature increases linearly with the increase of heat flux.By studying the influence of the geometric structure of porous media on the transpiration cooling effect,it was found that the increase of porosity and pore size will lead to the rise of solid wall temperature when other variables remain unchanged,which is not favorable to the protection of solid wall.The simulation results show that the increase of the coolant flow rate makes the temperature of the hot end wall drop rapidly,and even a small increase of the flow rate will have an obvious cooling effect.The temperature of the hot wall and the coolant flow are in a power function relationship,and the correlation is high.

关 键 词：多孔介质 发汗冷却 数值模拟 孔隙率 比表面积 

分 类 号：V430[航空宇航科学与技术—航空宇航推进理论与工程]