ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Numerical Simulation on Infrared Radiation Characteristics of Scramjet Nozzles
Received date: 2012-12-11
Revised date: 2013-04-15
Online published: 2013-04-24
Supported by
National Natural Science Foundation of China (61172083)
For mastery of the infrared radiation intensity distribution in different directions of the scramjet nozzles with different structures, based on the reverse Monte Carlo (RMC) method, the influence of different structures of the scramjet nozzles on the infrared radiation characteristics in 3-5 μm wave band is researched, including a planar expansion ramp, a curved expansion ramp and a curved expansion ramp with a lateral plate, and the distribution regularities of the nozzles’ infrared radiation in different directions are analyzed. The results show that the infrared radiation of the nozzles display an obvious asymmetry in the vertical plane with the strongest infrared radiation areas in the detection range from -70° to -40°. The high-temperature region of the exhaust plume produced by the curved nozzle is in the lower position, so that its infrared radiation intensity detected from below is higher than that from the planar nozzle. The lateral plate suppresses the infrared radiation in the horizontal direction effectively through sheltering it from the nozzle walls and the high temperature core of the exhaust plume.
CHAI Dong, FANG Yangwang, TONG Zhongxiang, LI Jianxun. Numerical Simulation on Infrared Radiation Characteristics of Scramjet Nozzles[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2013, 34(10): 2300-2307. DOI: 10.7527/S1000-6893.2013.0217
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