北京航空航天大学学报 ›› 2008, Vol. 34 ›› Issue (10): 1204-1209.

• 论文 • 上一篇    下一篇

多斜孔火焰筒壁冷却结构的数值模拟

李志强, 田 涛, 陈 钦   

  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 100191
  • 收稿日期:2007-10-18 出版日期:2008-10-30 发布日期:2010-09-16
  • 作者简介:李志强(1970-),男,山西长治人,副教授,lizhiqiang@buaa.edu.cn.

Numerical simulations of flame tube cooling structure with multi-jet holes

Li Zhiqiang, Tian Tao, Chen Qin   

  1. National Key Laboratory on Aero-Engines, Beijing University of Aeronautics and Astronautics, Beijing 100191, China
  • Received:2007-10-18 Online:2008-10-30 Published:2010-09-16

摘要: 通过数值模拟对多斜孔火焰筒冷却结构平板模型进行了研究,重点探讨了吹风比、孔斜角、孔阵排列方式、复合角和孔结构对壁面绝热温比的影响规律.结果表明:吹风比和孔斜角的大小对斜孔板的冷却效果有较大的影响,吹风比越大和孔斜角越小,冷却效果越好;孔阵的排列方式对冷却效果有一定的影响,长菱形分布优于正菱形分布;而孔偏角的引入则对冷却不利;与普通圆柱型斜孔相比,所提出的缩扩型斜孔在较低的吹风比下有利于改善冷却效果,而在大吹风比下则对冷却不利.

Abstract: The numerical simulation was used to study the film cooling effectiveness of plate with multi-inclined jet hole. The effect of the blowing ratio, oblique angle of the hole, array way of the hole, compound angle and shape of jet holes was investigated for increasing cooling efficiency. The computational results show that the blowing ratio and the oblique angle of the hole have important influence for the cooling efficiency. With the increase of the blowing ratio, the cooling efficiency increases, but the trend of increase is decreasing. And with the decrease of the oblique angle of the hole, the high cooling efficiency can be gained. The array way of the holes has a certain effect on the cooling efficiency, i.e. long diamond distribution is better than the regular diamond distribution. Also, the computational results show the introduction of the hole offset angle in the y direction is unfavorable for cooling. In addition, compared with cylinder holes, when the holes with the cone contractive entrance and the cone outspread exit are used, it is found that the cooling efficiency can be improved with low blowing ratio, and the cooling efficiency is inferior with high blowing ratio.

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