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为改善燃气轮机热端部件的设计,使用压力敏感漆(PSP)技术对平板气膜冷却进行了实验研究。该技术基于压力敏感涂料氧猝熄光致发光特性,可进行表面压力和气膜冷却效率的测量。分别在不同温度和压力下对PSP的特性进行标定,并编写了实验后处理程序。实验给出了圆孔、扇形孔和扇形后倾孔3种孔型在吹风比为0.5、1.0和1.5时的气膜冷却效率分布。结果表明:圆孔在高吹风比时,冷却气流易吹离表面,冷却效果较差;扇形孔冷却效率随着吹风比的增加而增加,并具有较均匀的横向冷却分布;与扇形孔相比,扇形后倾孔增强了下游的冷气在孔中心线上的分布,减弱了其横向扩展。PSP技术具有分辨率高、可重复性好的特点,能有效用于气膜冷却流动和传热特性的研究。
In order to improve the design of gas turbine hot-end components, the pressure-sensitive paint (PSP) technique was used to experimentally study the flat film cooling. The technology is based on the photo-quenching photoluminescence properties of pressure-sensitive coatings and allows the measurement of surface pressure and gas-film cooling efficiency. The characteristics of PSP were calibrated under different temperatures and pressures, and the experimental post-processing program was prepared. The experimental results show the film cooling efficiency distribution of the three kinds of holes with round holes, fan holes and fan-back holes when the blowing ratio is 0.5, 1.0 and 1.5. The results show that the cooling air flow is easy to blow away from the surface when the hole is at a high blowing ratio, and the cooling effect is poor. The cooling efficiency of a fan hole increases with the blowing ratio increasing and has a more uniform horizontal cooling distribution. Fan-shaped back hole to enhance the distribution of downstream air-conditioning centerline in the hole, reducing its horizontal expansion. PSP technology has the characteristics of high resolution and good repeatability, and can be effectively used for the research of film cooling flow and heat transfer characteristics.