【作者】 全栋梁； 李江海； 刘高文； 刘松龄； 许都纯；

【Author】 QUAN Dong-liang , LI Jiang-hai, LIU Gao-wen, LIU Song-ling, XU Du-chun (College of Engine and Energy, Northwestern Polytechnical University, Xi’an 710072)

【机构】 西北工业大学动力与能源学院；

【摘要】 多孔层扳冷却集冲击冷却、对流冷却和气膜冷却于一体,具有冷气消耗量少、冷却效率高的优点,是下一代航空发动机的关键技术之一。在大尺寸低速风洞中采用红外热成像仪对3种应用于涡轮叶片的典型多孔层板结构进行了冷却有效性的实验研究,通过开发的红外热像仪程序包获得了层板表面详细的壁温分布和冷效分布,运用参数f分析了层板结构参数对其冷却有效性的影响。结果表明多孔层板结构具有很高的冷却有效性,开孔率是影响冷却有效性的决定因数,开孔率越大,冷效越高。参数f、燃气侧气膜冷却效率ηf和层板内部换热效率η(?)是层板优化设计的重要依据。红外测温技术以其非接触和快捷有效的优势在多孔层板冷却特性的研究中具有重要的应用价值。更多还原

【Abstract】 Lamilloy has comprehensive advantages of hot-side film cooling, internal impingement cooling, large internal heat transfer area and enhanced heat exchange caused by pin fin array, so it is considered as a promising cooling concept to meet the requirement of modern advanced aircraft engines. Three typical configurations of Lamilloy were made and tested in a large scale low speed close-looped wind tunnel by infrared thermography. The detailed two-dimensional contour map of temperature and cooling effectiveness were obtained. Non-dimensional parameter f was applied in the analysis of cooling effectiveness. The experimental results showed that very high cooling effectiveness can be achieved with laminate plates and the hole area ratio plays the most important role in determination of the cooling effectiveness, the bigger the ratio, the higher cooling effectiveness. The parameter f, adiabatic effectiveness of film, cooling at gas side and the internal heat transfer efficiency of the configuration were important parameters in optimization of the design. Infrared technique is a cost effective, essentially nonintrusive and promising way in assess the relative cooling performance of different configurations of Lamilloy.更多还原