Exhaust system is the most important infrared radiation source of a long-endurance UAV and the shape of the nozzle contribute to the infrared radiation characteristics of exhaust system. This paper built a 2-D nozzle and use ANSYS14.5 simulated the temperature filed of the plume. And then, spectral infrared radiation characteristics of the plume were obtained by the single band C-G approximation method. Finally, the infrared radiation intensity distribution of the exhaust system of the 2-D nozzle in different planes is obtained. The results show: The infrared radiation of the plume in wide side detection surface is far greater than the narrow side; The infrared radiation of the nozzle in wide side detection surface is smaller than the narrow side; The infrared radiation of the exhaust system in wide side detection surface is smaller than the narrow side. The results maybe contribute to the further study of the infrared radiation characteristics of the long-endurance UAV.
Plume is the main infrared source of a long-endurance UAV, and its infrared radiation numerical calculation is very
important for calculating the infrared characteristcs of the whole UAV. This paper built the geometrical model of the flow
field structure of UAV plume by analyzing the characteristcs of the flow structure. And, The temperaturre field
distribution of the UAV plume was calculated based on the eddy current propagation theory. And then, spectral infrared
radiation characteristics of the UAV plume at 2-5μm were obtained by the single band C-G approximation method. The
results show that the temperature in the core area of the UAV plume is higher , and the infared radiation characteristics
are stable and obvious. The infrared radiation energy of the plume mainly ditributed at the infrared wavelength of 2.7μm
and 4.5μm,which is in accordance with the actual situation. The results maybe contribute to the further study of the
infrared radiation characteristics of the long-endurance UAV.
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