| 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。 |
| 关键词: 旋转换热 内冷通道 高旋转数 高雷诺数 转角 |
| DOI： |
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| Heat Transfer in Rotating Two-Pass Square Duct with 45° Ribbed Walls under High Rotation Numbers |
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CHEN Hao1,2,DENG Hong-wu1,2,LI Yang1,2,TIAN Shu-qing3
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(1. National Key Laboratory of Science and Technology on Aero-Engine Aero-Thermodynamics/School of Energy and Power Engineering，Beijing University of Aeronautics and Astronautics，Beijing 100191，China;2. Collaborative Innovation Center of Advanced Aero-Engine，Beijing 100191，China;3. R&D center，AVIC Commercial Aircraft Engine Corporation Ltd，Shanghai 201108，China)
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| Abstract: |
| 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. |
| Key words: Rotating heat transfer Cooling channel High rotation number High reynolds number Orientation |
