High temperature cooling experiment of gas film hole based on infrared temperature measurement technology
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摘要:
设计了一种低成本、高精度的气膜冷效实验验证平台，针对平板样件不同结构的气膜孔进行高速高温火焰冲击实验，利用红外测温技术对实验平板的温度场进行数据采集与综合分析。实验结果表明：两种孔形
x 向的温度梯度都明显小于y 向，但是猫耳孔在y 向有更好的冷却效果；同时猫耳孔的x 向综合冷却效率也优于圆柱孔，并且冷却气流更倾向于形成稳定的气膜覆盖；此外，猫耳孔在单位面积中的总体冷却效果要优于圆柱孔，但在冷气出口附近可能产生较大的热应力；同时得到，猫耳孔气膜冷却降温面积较圆柱孔而言也有较大提升。Abstract:A low-cost, high-precision experimental verification platform of film cooling effect was designed. The high-speed and high-temperature flame impact experiment was carried out for the film holes with different structures of plate samples. The infrared temperature measurement technology was used to collect and analyze the temperature field of the plate. The results showed that the temperature gradient in
x direction of the two hole shapes was smaller than that iny direction, but the cat-ear hole had better cooling effect iny direction; Thex -direction comprehensive cooling efficiency of cat-ear hole was also better than that of cylindrical hole, and the cooling air flow was inclined to form a stable film cover; In addition, the overall cooling effect of cat-ear hole in unit area was better than that of cylindrical hole, but greater thermal stress may occur near the outlet of cold air. The cooling area of cat-ear hole film cooling was also larger than that of cylindrical hole.-
Key words:
- special shaped hole /
- film cooling /
- infrared thermal imager /
- cooling efficiency /
- temperature field
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图 1 气膜冷效实验验证平台系统结构图
Figure 1. System structure diagram of film cooling effect experiment verification platform
图 7 实验组高温火焰冲击气膜冷却平板实物图
Figure 7. Physical drawing of high temperature flame impact on film cooling plate of experimental group
图 8 红外温度计和热成像仪调试温度-时间曲线
Figure 8. Commissioning temperature time curve of infrared thermometer and thermal imager
图 12 沿x方向两种气膜孔的综合冷却效率
Figure 12. Comprehensive cooling efficiency of two kinds of holes along the x direction
图 13 两组平板热成像单位面积提取示意图
Figure 13. Schematic diagram of average area of two groups of plate thermal imaging
图 14 圆柱孔温度分布曲面图和等温线图
Figure 14. Surface diagram and isotherm diagram of temperature distribution of cylindrical hole
图 15 猫耳孔温度分布曲面图和等温线图
Figure 15. Surface diagram and isotherm diagram temperature distribution of cat-ear hole
图 16 两种气膜孔温升面积比较
Figure 16. Comparison of temperature rise area between two kinds of film holes
表 1 两种孔形平板在x和y方向上的最高温度和最低温度
Table 1. Maximum temperature and minimum temperature in x and y directions for two kinds of hole shaped flat plates
参数 气膜孔形 圆柱孔 猫耳孔 最低温度/K 1105.4 1074.3 x方向最高温度/K 1144.9 1106.4 y方向最高温度/K 1124.9 1193.5 
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