环形燃烧室冷热态发散冷却性能的对比实验

摘要/Abstract

摘要： 针对燃烧室发散冷却性能的研究，设计了3头部扇段模型燃烧室进行冷热态对比实验.通过对模型环形燃烧室内外环面上的温度进行测量，讨论冷热态时综合冷却效率分布差异，并考察了冷却空气量与主流空气量之比对综合冷却效率的影响规律.结果表明：发散冷却在冷热态时的综合冷却性能差异显著，主要是由于燃烧反应的发生改变了燃烧室内流场和温度场，进而引起壁面热负荷变化；无论冷态还是热态，在旋流主流的作用下，内环面上的发散气膜相比于外环面更易吹离壁面.随着无量纲流量比的增加，面积平均综合冷却效率均随之增加，但增加幅度逐渐降低.

关键词: 发散冷却；低污染燃烧室；综合冷却效率

Abstract: Threenozzle annular model combustor is designed to investigate the effusion cooling characteristics under nonreacting and reacting flow conditions. Temperature was measured on both outer and inner liners of the combustor, and then difference of overall cooling effectiveness distribution with or without combustion is analyzed. The effect of coolant to mainstream air flowrate ratio on the overall cooling effectiveness is studied. Results showed that effusion cooling behavior under reacting condition looks distinctly different from that under nonreacting condition. Specifically, cooling effectiveness showed laterally nonuniform distribution and skewed towards the micro rotation direction result from three separate coswirling flows merge. The most significant phenomenon at reacting flow condition is that low cooling effectiveness region shows up. This is because of the swirling flame impinging on the combustor liners.

Key words: effusion cooling; lowemission combustion; overall cooling effectiveness

中图分类号:

V 231.2

吉雍彬1，杜世强2，虞江鹏1，葛冰1，臧述升1. 环形燃烧室冷热态发散冷却性能的对比实验 [J]. 上海交通大学学报, 2017, 51(8): 962-969.

JI Yongbin1，DU Shiqiang2，YU Jiangpeng1，GE Bing1， ZANG Shusheng1. Comparative Experimental Investigation of Effusion Cooling
Performance on the Annular Combustor Liners at
Nonreacting/Reacting Flow Conditions[J]. Journal of Shanghai Jiao Tong University, 2017, 51(8): 962-969.

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