Volume 29 Issue 1
Jan.  2014
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Article Navigation >  Journal of Aerospace Power  > 2014  >  29(1): 42-50
SI Ren, JI Hong-hu, LIU Fu-cheng, LIN Lan-zhi. Numerical investigation of high altitude performance of 2-D ejector nozzle and infrared supperssion of unmanned aerial vehicle[J]. Journal of Aerospace Power, 2014, 29(1): 42-50. doi: 10.13224/j.cnki.jasp.2014.01.006
Citation: SI Ren, JI Hong-hu, LIU Fu-cheng, LIN Lan-zhi. Numerical investigation of high altitude performance of 2-D ejector nozzle and infrared supperssion of unmanned aerial vehicle[J]. Journal of Aerospace Power, 2014, 29(1): 42-50. doi: 10.13224/j.cnki.jasp.2014.01.006
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Numerical investigation of high altitude performance of 2-D ejector nozzle and infrared supperssion of unmanned aerial vehicle

doi: 10.13224/j.cnki.jasp.2014.01.006

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

  • Received Date: 2012-12-04
  • Publish Date: 2014-01-28
    Abstract
  • The thrust characteristics and infrared radiation characteristics in the waveband of 3-5μm of 2-D ejector nozzle with long/short shrouds in the high-flying unmanned aerial vehicle(UAV) were studied.The thrust characteristics and infrared radiation characteristics of 2-D ejector nozzle under the conditions of high-altitude and ground state were compared.The system of the exhaust jet, UAV flow field and temperature field were calculated with commercial software Fluent, and the infrared radiation characteristics were calculated with an infrared analysis software(NUAA-IR) developed independently.The results show that the 2-D ejector nozzle can still improve thrust characteristic under the condition of high-altitude,but the thrust characteristic is a little weaker than that under ground condition.The effect of infrared radiation suppression of 2-D ejector nozzle used by UAV is obvious in most of the detection directions,with the largest decreasing amplitude of 90%.The trend of infrared radiation suppression of these two types of 2-D ejector nozzles in the direction of UAV's tail is different from that under ground condition;the infrared radiation of the 2-D ejector nozzle with short shroud is greater than that with long shroud,and the largest increasing amplitude is 7%.

     

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