Investigation of convective heat transfer on a wedge-shaped concave surface subjected to a row of tab-excited hot jets

被引：0
作者：
Guan T. [1 ]
Zhang J.-Z. [1 ,2 ]
Shan Y. [1 ]
机构：
[1] Jiangsu Province Key Laboratory of Aerospace Power System, Nanjing University of Aeronautics and Astronautics, Nanjing
[2] Collaborative Innovation Center of Advanced Aero-Engine, Beijing
来源：
Tuijin Jishu/Journal of Propulsion Technology | 2016年 / 37卷 / 01期
关键词：
Convective heat transfer; Hot jets; Jet impingement; Tab-excitation; Wedge-shaped concave surface;
D O I：
10.13675/j.cnki.tjjs.2016.01.017
中图分类号：
学科分类号：
摘要：
To improve impingement heat transfer used by the hot-air jets which act on the wedge-shaped concave surface of aero-engine anti-icing inlet strut, the tabbed excitation was adopted for the conventional round jet. Three-dimensional inner-flow and outer-flow conjugate heat transfer simulations were conducted to investigate the effects of tab number, tab penetration ratio(l/d) and jet impinging distance(H/d) on the heat transfer performance of the wedge-shaped concave surface. The results show that the tabs increase the core velocity and turbulent kinetic energy of the jet, and improve the convective heat transfer of jet impingement. In relative to the conventional impinging jet without tabs, the temperature of the wedge-shaped concave surface on the condition of 4-tabs, 6-tabs and 8-tabs increased by 1.2K, 2.3K, 2.8K and the Nusselt numbers increased by 17%, 28%, 33%, respectively. The temperature of concave surface also increased with the tab penetration ratio. The impingement distance has a significant influence on the convective heat transfer of the concave surface. The surface temperature and Nusselt numbers of H/d=6 increased 7.2 K and 67%, respectively, compared with H/d=12 without the effects of tabbed excitation. On the other hand, the surface temperature and Nusselt numbers of H/d=6 increased 8.5 K and 90%, respectively, compared with H/d=12 with the effects of tabbed excitation. Total pressure loss of second flow increases with the increasing of the tab numbers and tab penetration length ratio. © 2016, Journal of Propulsion Technology. All right reserved.
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页码：119 / 127
页数：8
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