摘要
针对单向纤维增韧特点的复合材料多排孔平板开展冲击/气膜冷却特性数值模拟,分析了X,Y,Z三个方向导热系数对多排孔气膜冷却壁面温度场和综合冷却效率的影响。结果表明:(1)从整体上来看,随着X方向导热系数的增加,平板表面的综合冷却效率变化发生在X/D <35和X/D> 60范围内;在X/D <35范围内,综合冷却效率随着X方向导热系数的增加逐渐增大;在35 <X/D <60范围内,综合冷却效率几乎不变;在X/D> 60范围内,综合冷却效率随着X方向导热系数的增加逐渐减小。(2)随着Y方向导热系数的不断增大,沿程展向综合冷却效率几乎没有变化。(3)随着Z方向导热系数的不断增大,综合冷却效率逐渐升高,尤其是Z方向导热系数从4W/(m·K)增加到40W/(m·K),综合冷却效率增幅达到6%;随着Z方向导热系数的增大,综合冷却效率的增幅在逐渐减小。
Numerical simulations on the anisotropic composite plates with multi row holes are conducted to analyze the influences of thermal conductivity along the X, Y, and Z direction on the wall temperature distribution as well as the overall cooling effectiveness. The results show that, the change of the total cooling efficiency occurs with the increase of the thermal conductivity along the X direction when X/D 〈 35 and X/D 〉 60. The total cooling efficiency increases with the increase of thermal conductivity along the X direction when X/D 〈 35 while the total cooling efficiency decreases with the increase of thermal conductivity along the X direction when X/D 〉 60.The increase of the thermal conductivity along the Y direction has no influence on the total cooling efficiency. But the increase of the thermal conductivity along the Z direction can improve the total cooling efficiency.
作者
侯亚东
吕旭飞
刘志远
Hou Yadong;Lv Xufei;Liu Zhiyuan(Chinese Flight Test Establishment,Xi＇an 710000,Shaanxi,China)
出处
《工程与试验》
2018年第3期43-51,共9页
Engineering and Test
关键词
冲击/气膜冷却
各向异性复合材料
导热系数
综合冷却效率
温度场
impact/film cooling
anisotropic composite material
thermal conductivity
overall cooling effectiveness
temperature field
