新型双层壁隔热屏气膜板内壁面换热特性数值研究  

Numerical Investigation on Internal Heat Transfer Characteristic of Film Plate in a New Double-Wall Liner

作　　者：魏建生[1] 郭涛[1] 朱惠人[1] 谢建光[2] 

机构地区：[1]西北工业大学动力与能源学院,陕西西安710072 [2]中国燃气涡轮研究院,四川成都610500

出　　处：《推进技术》2015年第1期68-74,共7页Journal of Propulsion Technology

基　　金：国家重点基础研究发展计划资助项目(2013CB035702)

摘　　要：为了研究加入二次倾斜冲击后双层壁隔热屏内通道的流动特征和换热分布，通过数值模拟研究了不同冲击距离和不同中间孔直径下，冲击雷诺数在2500~7500，气膜板内壁面的换热系数分布特征。结果显示：冲击距离越短，高换热区域面积越大，平均换热系数越高；冲击距离对气膜孔所在环腔内的二次冲击和旋流之间的相互作用影响较大；中间孔直径越小，平均换热系数越高，气膜孔所在的环腔内二次冲击范围越小，漩涡冲击范围越大。Numerical simulation was carried out to study the internal flow and heat transfer characteristics of the double-wall afterburner liner which was added with second oblique impingement. Internal heat transfer co-efficient distribution on the film plate was investigated at different impingement distances and different middle-hole diameters in the Reynolds number range of 2500~7500. The results show that the region with high heat trans-fer extends and the area-average Nusselt number increases with the decrease of the impingement distance. The in-teraction of the second impingement and the vortex flow in the cavity where the film holes were located is mainly influenced by the variation of the impingement distance. In the cavity where the film holes were located , the re-gion with the vortex impingement increases and the region of the second impingement decreases with the decrease of the middle-hole diameter. The area-average Nusselt number increases with the decrease of the middle-hole diameter.

关 键 词：双层壁 加力燃烧室 隔热屏 内换热 数值计算 

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]