尾向可见明火大宽高比混合排气喷管红外抑制特性试验

Experimental investigation of infrared suppressing characteristics of rectangular nozzles with large aspect ratio

College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

摘要: 对5组不同宽高比(W/H=1～1)的圆转矩形收敛喷管模型(AR1～AR1) 在尾向可见明火时的红外辐射特性进行了试验研究,并与等出口面积的轴对称喷管(AR0)进行了比较,喷管模型为某型实际喷管缩比4.3倍得到的.研究发现,与轴对称喷管相比,大宽高比矩形喷管减小了红外源的辐射特征,起到了明显的红外抑制作用.在0°～90°范围内,所研究的喷管在3～5 μm波段上的红外辐射信号呈现随探测角度增大逐渐减小的规律.
- 航空、航天推进系统 /
- 红外抑制 /
- 矩形喷管 /
- 大宽高比 /
- 航空发动机
Abstract: The infrared suppressing characteristics of five rectangular convergent nozzles with different aspect ratios were investigated experimertey.The aspect ratio of the rectangular nozzles is 1,4,8,12,and 16,named AR1~AR16 respectively,while the axisymmetric nozzle is named AR0.The results indicate that infrared radiation from rectangular nozzle decreases with the increase of detection angle,and the magnitude of infrared radiation is smaller than axisymmetric one,and would accelerate with the rise of aspect ratio.
- aerospace propulsion system /
- infrared suppressing /
- circle to rectangular cross-sections /
- large aspect ratio /
- aeroengine

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