塞锥气膜冷却对二元塞式喷管红外特征的影响

为了研究二元塞式喷管塞锥壁面多斜孔气膜冷却对喷管红外特征的影响，设计了带冷却结构的喷管试验模型，测量了吹风比从0增加到1时的塞锥壁面温度、喷管出口截面处喷流温度以及喷管红外辐射强度.结果表明：随着吹风比的增加，气膜冷却效率逐渐提高，最大达到0.68；喷管出口截面在中心区域喷流的温度逐渐降低，最大降幅为14%；喷管红外辐射强度逐渐降低，在0°方位角上最大降低52.8%，在90°方位角上最大降低13%.

Effect of wedge film cooling on the infrared signature of two-dimensional wedge nozzle

The experimental model of two-dimensional wedge nozzle with cooling structure was designed, and a series of experimental investigations were conducted to measure the effect of wedge film cooling on infrared signature of the nozzle. The wedge wall temperature, the jet flow temperature on the nozzle exit and the infrared radiation intensity of the nozzle were measured at blowing ratios of 0 to 1. Results show that,with the increase of blowing ratio, the wedge wall temperature gradually decreases and the film cooling effectiveness increases up to 0.68; the jet flow temperature on center area of the nozzle exit decreases to 14%, the infrared radiation intensity of the nozzle gradually decreases to 52.8% at azimuth angle of 0° and 13% at azimuth angle of 90°.