高旋转数下45°斜肋回转通道平均换热特性研究  

Heat Transfer in Rotating Two-Pass Square Duct with 45° Ribbed Walls under High Rotation Numbers

作　　者：陈豪[1,2] 邓宏武[1,2] 李洋[1,2] 田淑青 

机构地区：[1]北京航空航天大学航空发动机气动热力重点实验室/能源与动力工程学院,北京100191 [2]先进航空发动机协同创新中心,北京100191 [3]中航商用航空发动机有限责任公司设计研发中心,上海201108

出　　处：《推进技术》2015年第9期1339-1346,共8页Journal of Propulsion Technology

摘　　要：为了更加深入地研究涡轮叶片回转通道的换热特性，研究了高旋转数下带45°斜肋回转通道的平均换热特性。在通道进口雷诺数从10000～70000，旋转数从0～2.07的范围内，实验研究了旋转状态下，方形截面带45°斜肋U型通道径向出流与径向入流两个流程四个侧面在0°，22.5°和45°三个安装角下的平均换热系数。研究结果表明：45°斜肋增强了通道换热，减弱了旋转对换热的影响；由于浮升力作用在肋间二次流上，导致通道内外侧出现临界回流现象；转角减弱了第一通道旋转对换热的影响，增强了第二通道旋转对换热的影响，其影响在低旋转数下并不显著，在高旋转数下开始变得明显。In order to get a more in-depth investigation of the heat transfer characteristics of the rotating channels, a new investigation of the average heat transfer characteristics of the rotating two-pass channel with 45° ribs was implemented. The Reynolds and Rotation numbers ranged from 10000 to 70000 and 0 to 2.07 respectively. Three different channel angles （0°,22.5°,45°） were selected to study the effects of channel orientation on average heat transfer of the four sides on the two-pass U channel. The results show that the 45° ribs enhance the heat transfer while weakening the effects of rotation on heat transfer. The angled rib induced secondary flow which touched off a critical inverse flow on outer and inter face caused a critical heat transfer phenomenon. The orientation enhanced the heat transfer in the first-pass and weakened it in the second pass. The effect of the orientation is not notable in the low Rotation numbers while becoming stronger in the high Rotation numbers.

关 键 词：旋转换热 内冷通道 高旋转数 高雷诺数 转角 

分 类 号：V235.1[航空宇航科学与技术—航空宇航推进理论与工程]