金属丝网发散冷却与颗粒沉积关系探究

Investigation on the relation of transpiration cooling of sintered woven wire mesh and particle deposition

在所开展的发散冷却试验中,用金属丝网实现发散冷却结构,选用固定熔点的石蜡液滴,模拟发散冷却叶片上炭烟颗粒沉积的物理过程。通过调节发散冷却吹风比和主流温度,在一系列喷雾时间下,模拟产生沉积物。借助红外热像仪获取了金属丝网表面温度分布,利用光学扫描系统获得了沉积物的堆积分布和堆积厚度。研究结果表明,颗粒沉积会降低发散冷却效率,且沉积厚度将对冷却效率的变化产生影响。

In the transpiration cooling test, the transpiration cooling structure was modeled by sintered woven wire mesh, and the deposition physical process of soot particles on the transpiration cooling blade was simulated using paraffin wax droplets with a fixed melting point. By adjusting the blowing ratio and the mainstream temperature, the deposition was produced over a period of spraying. The surface temperature of the sintered woven wire mesh was obtained by infrared thermal imager. The thickness of the deposition was obtained by optical scanning system. The study results showed that the deposition of particles could reduce the efficiency of transpiration cooling, while the deposition thickness had an impact on the change of cooling efficiency.