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针对某型折流燃烧室外环壳体前端典型区域,设计了模拟主流局部流场的发散冷却模型.通过红外热像仪测量发散孔板表面的温度场,分析比较了吹风比、发散孔阵列方式、孔径及开孔率对综合冷却效率的影响.发散孔阵列方式有正菱形、长菱形和超长菱形3种,孔径变化范围为0.6~1.0mm,开孔率范围为3%~6%,吹风比变化范围为1~6.结果表明:由于壳体前端回流区的影响,发散孔板综合冷却效率沿主流方向整体呈现先升高后降低的趋势.吹风比为2时的综合冷却效率最高,发散孔阵列呈长菱形排布较优.在相同的开孔率下,孔径的减小有利于改善综合冷却效率.发散孔板开孔率从3%增加到4.8%可以显著提高综合冷却效率.
Aiming at the typical front-end of the outer ring shell of a baffled combustion chamber, a divergent cooling model was designed to simulate the mainstream flow field in the baffled combustion chamber.By measuring the temperature field on the surface of the diffuser with infrared thermography, the blow ratio, Mode, pore size and open area ratio on the overall cooling efficiency.Distributed pore array has three kinds of rhombus, rhomboid and extra long rhombus, the pore size range of 0.6 ~ 1.0mm, the rate of open porosity ranged from 3% to 6% , And the blowing ratio ranged from 1 to 6. The results show that the overall cooling efficiency of the diffuser plate increases firstly and then decreases along the main stream due to the influence of the recirculation zone at the front of the shell.The overall cooling efficiency The highest, the distribution of the array of diffuse holes is longer and rhombus-shaped arrangement is better.At the same opening rate, the reduction of the aperture is conducive to improving the overall cooling efficiency.Diffusion orifice opening rate from 3% to 4.8% can significantly improve the overall cooling effectiveness.