多斜孔平板总冷却效率及其梯度分布试验研究  

Test Study on Overall Cooling Efficiency and Gradient Distribution of Multi-inclined Hole Plate

作　　者：彭云晖 张弛[2] 许全宏[2] 林宇震[2] PENG Yun-hui;ZHANG Chi;XU Quan-hong;LIN Yu-zhen(Nanjing Research Institute of Simulation Technology,Nanjing 210016,China;National Key Laboratory of Science and Technology on Aero-Engine Aero-thermodynamics,Beihang University,Beijing 100191,China)

机构地区：[1]南京模拟技术研究所,南京210016 [2]北京航空航天大学航空发动机气动热力国家级重点实验室,北京100191

出　　处：《航空发动机》2019年第6期56-61,共6页Aeroengine

基　　金：国家自然科学基金(91641109)资助

摘　　要：为了发展燃烧室先进冷却技术,在吹风比0.35~3.28下试验研究了多斜孔平板的总冷却效率及其梯度。研究所用的多斜孔平板具有与典型航空发动机燃烧室相似的交叉排列多斜孔布局,但采用低导热系数材料制成,以展示和分析多斜孔平板的传热过程。采用红外成像技术测量了多斜孔平板的表面2维温度场,从而获得壁面总冷却效率及其梯度的分布。试验结果表明:随着吹风比从0.35增大到3.28,多斜孔平板在充分发展区域的展向平均冷却效率从0.61先增大到0.70后减小到0.67,原因是总冷却效率实质上得益于多斜孔内部的对流换热和冷却气膜的覆壁保护作用。In order to develop the advanced cooling technology of the combustion chamber,the overall cooling efficiency and gradient of the multi-inclined hole plate were studied under the blowing ratio of 0.35 to 3.28.The multi-inclined hole plate used in the study had a cross-arranged multi-inclined hole layout similar to that of a typical aeroengine combustor,but was made of low thermal conductivity material to show and analyze the heat transfer process of the multi-inclined hole plate.The surface 2-dimensional temperature field of the multi-inclined hole plate was measured by the infrared imaging technique,and the overall cooling efficiency of the wall and the distribution of the gradient were obtained.The test results show that with the increase of blowing ratio from 0.35 to 3.28,the average cooling efficiency of multi-inclined hole plate in the fully developed area increases from 0.61 to 0.70 and then decreases to 0.67,which is due to the fact that the overall cooling efficiency is essentially due to the convective heat transfer in the multi-inclined hole and the wall protection of the cooling gas film.

关 键 词：多斜孔冷却 总冷却效率 红外成像 燃烧室 航空发动机 

分 类 号：V231.1[航空宇航科学与技术—航空宇航推进理论与工程]