冲击/逆向对流/发散冷却与冲击/发散冷却的冷却效率对比

Cooling Effectiveness Comparison of Impingement/Reversed Convection/Effusion Cooling and Impingement/Effusion Cooling

为解决燃烧室火焰筒下游壁温过高的问题,对冲击/逆向对流/发散冷却和冲击/发散冷却的综合冷却效率进行对比分析。结果表明:冲击/逆向对流/发散冷却降低了上游1/3区域的冷却效率,强化了下游冲击换热,提高了下游2/3区域的冷却效率;起始气膜可以有效弥补冲击/逆向对流/发散冷却在上游发散孔的冷却效率,提高了整体冷却效率。

In order to improve the problem of too high temperature downstream of the flame tube in the combustion chamber,the overall cooling effectiveness of impingement/reversed convection/effusion cooling and impingement/effusion cooling were comparatively analyzed.The results show that impingement/reversed convection/effusion cooling appropriately reduces the cooling effectiveness of the downstream 2/3 region;for the impingement/reversed convection/effusion cooling,the starting gas film can effectively make up for the cooling effectiveness of the upstream region,which improves the overall cooling effectiveness.