单筒形氢氧燃烧室壁面冷却结构及特性研究

Research on Wall Cooling Structure and Cooling Performance of a Single Cylinder H_2-O_2 Combustion Chamber

针对新型氢氧燃机热力循环系统,提出了一种壁面水冷氢氧燃烧室,通过CFD软件优化了其壁面冷却结构,并在此基础上对其水冷壁面冷却特性进行了实验研究。结果表明:相同条件下,小深宽比的冷却结构的冷却效果优于大深宽比冷却结构的冷却效果;在设计的不同负荷下,燃烧室壁面温度最高不超过400K;在主燃区轴向距离x≈0.035m处,冷却水体积流量为0.8m^3/h时壁面局部热流密度最大值约为246.5kW/m^2,壁面局部热流密度随着冷却水体积流量的增加而增加。

A novel single cylinder H2-O2 combustion chamber with wall cooling was proposed based on the new hydrogen and oxygen gas turbine thermal cycle system. The wall cooling structure was optimized by CFD, based on which, experimental studies were carried out on the water cooling characteristics. Results show that, the cooling performance of the cooling structure with small depth-to-width ratio is better than that with high depth-to-width ratio. The wall temperatures of the combustion chamber are all below 400 K at different loads. In the primary zone around x=0. 035 m, the maximum local wall heat flux is about 246. 5 kW/m2 for the cooling water flow rate of 0.8 m3/h; the local wall heat flux increases with the rise of cooling water flow rate.