北京航空航天大学学报 ›› 2006, Vol. 32 ›› Issue (08): 922-925.

• 论文 • 上一篇    下一篇

具有离散出气孔的旋转盘平均换热特性

罗翔, 徐国强, 陶智, 丁水汀   

  1. 北京航空航天大学 航空发动机气动热力重点实验室, 北京 100083
  • 收稿日期:2005-09-21 出版日期:2006-08-31 发布日期:2010-09-19
  • 作者简介:罗 翔(1973-),男,四川成都人,博士后, xiang.luo@buaa.edu.cn.

Heat transfer measurements on a rotating disk with discrete receiver holes

Luo Xiang, Xu Guoqiang, Tao Zhi, Ding Shuiting   

  1. National Key Laboratory on Aero-Engines, Beijing University of Aeronautics and Astronautics, Beijing 100083, China
  • Received:2005-09-21 Online:2006-08-31 Published:2010-09-19

摘要: 实际发动机涡轮盘腔结构中的冷气进入叶片的冷却通道被简化为旋转盘上离散的通孔,冷气从静盘的中心流入,然后从这些通孔和转静盘间隙流出.针对这样的转静系统进行换热实验,得到了旋转盘表面的平均换热系数和转盘上通孔内平均换热系数.分析了转速、冷却气体流量对换热特性的影响,并给出了无量纲经验关系式.结果显示进气流量系数和旋转雷诺数的增加将导致盘面平均努塞尔数和通孔内表面的平均努塞尔数的增加.

Abstract: Modern gas turbines are cooled using air diverted from the compressor. In a rotor stator system, the cooling air enters at the center of stator and flows radially outward, then leaves through the discrete receiver holes in the rotor and clearance between rotor and shroud. The rotor with 440mm diameter has 60 blade-cooling holes with 6mm diameter at a radius of 195mm.The temperatures on rotor surface at a number of radial locations were measured by thermocouples. The average Nusselt numbers on the rotating disc Nuav,d and on the surface of receiving holes Nuav,b were determined by experiment results. The magnitude of them was governed by two nondimensional fluid-dynamic parameters: rotational Reynolds number, nondimensional mass flow rate. The experiments reveal that Nuav,d and Nuav,b are increasing as either of them increases. The Nusslet number Nuav,d increases strongly with rotational Reynolds number and weekly with nondimensional mass flow rate compared to the rotating disk without receiver holes.

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