| 带凹坑楔形通道内射流冲击换热特性实验 |
| |
| 引用本文： | 蒋新伟,许卫疆,朱惠人.带凹坑楔形通道内射流冲击换热特性实验[J].航空动力学报,2017,32(12):2981-2987. |
| |
| 作者姓名： | 蒋新伟 许卫疆 朱惠人 |
| |
| 作者单位： | 西北工业大学 动力与能源学院，西安 710072 |
| |
| 摘 要： | 为了获得发动机进气道支板的热气防冰特性，采用热色液晶全表面瞬态测温技术对带凹坑楔形通道内表面开展冲击换热实验。研究了射流雷诺数，凹坑间距，射流入口到凹坑的距离和凹坑排数对壁面努塞尔数分布和大小的影响。结果表明:带凹坑壁面的平均换热效果要强于光滑壁面，两者的努塞尔数均随雷诺数的增加而增大。壁面的局部努塞尔数在凹坑尾缘出现一个峰值，凹坑间距越小，侧壁的平均换热效果越强。在小雷诺数时，凹坑的位置靠近出口缝，能够较大的增强侧壁的换热；在较大雷诺数时，凹坑位置越靠近前缘，则越能增强前缘的换热效果。当凹坑的排数增加，壁面的平均努塞尔数增大。
|
| 关 键 词： | 射流冲击 凹坑 强化换热 防冰 进口支板 |
| 收稿时间： | 2016/5/14 0:00:00 |
Experiment of impingement heat transfer characteristics in dimpled wedge channel |
| |
| Abstract: | In order to obtain the hot air anti icing properties of engine inlet strut, an impingement heat transfer experiment was carried out in a dimpled wedge channel with use of transient thermochromic liquid crystal measurement technique. The effects of jet Reynolds number (Re), distance between jet entrance and dimple, dimple space and the number of dimple rows on Nusselt number (Nu) were studied. The results shows that Nu increases with the increasing Reynolds number, and the heat transfer of dimpled wall is stronger than that of smooth wall. Local Nusselt number reaches a maximum at the trailing edge of the dimple. The average heat transfer effect of side walls increases when the dimple space decreases. When the dimples are close to the outlet, there is an obvious enhancement to the side wall Nu at small Re, while the heat transfer at the leading edge is enhanced at relative large Re. When the number of dimple rows increases, the average Nu increases. |
| |
| Keywords: | impingement dimple heat transfer enhancement anti icing inlet strut |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《航空动力学报》浏览原始摘要信息 |
|
点击此处可从《航空动力学报》下载全文 |
|
