Volume 29 Issue 3
Mar.  2014
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REN Li-feng, ZHANG Jing-zhou, SHAN Yong, WANG Xu, WANG Xing-tao. Effects of rotor downwash and exhaust direction on infrared radiation characteristics of helicopter[J]. Journal of Aerospace Power, 2014, 29(3): 532-540. doi: 10.13224/j.cnki.jasp.2014.03.008
Citation: REN Li-feng, ZHANG Jing-zhou, SHAN Yong, WANG Xu, WANG Xing-tao. Effects of rotor downwash and exhaust direction on infrared radiation characteristics of helicopter[J]. Journal of Aerospace Power, 2014, 29(3): 532-540. doi: 10.13224/j.cnki.jasp.2014.03.008

Effects of rotor downwash and exhaust direction on infrared radiation characteristics of helicopter

doi: 10.13224/j.cnki.jasp.2014.03.008
  • Received Date: 2013-01-14
  • Publish Date: 2014-03-28
  • The hot exhaust plume flow characteristics under the action of helicopter rotor downwash were investigated based on numerical calculations.And the effects of rotor downwash velocity and exhaust direction on the infrared radiation characteristics of helicopter were analyzed.The results show that:under different exhaust directions,influences of rotor downwash on the hot exhaust plume differ a lot;when the hot exhaust is ejected upwards,the exhaust plume can come into collision with rear fuselage under the action of rotor downwash,leading to the rise of temperature of rear fuselage;when the exhaust is ejected upwards,the infrared radiation intensity of solid under rotor downwash velocity of 10m/s is larger than that without rotor downwash,the infrared radiation intensities show a gradual decreasing trend with the increase of rotor downwash velocity for oblique exhaust of 45° and sideward exhaust ways.The exhaust direction shows significant influence on the infrared radiation distribution.When the exhaust is ejected in oblique direction, the infrared radiation intensity detected from top direction is almost the same as that from lateral direction.While exhaust is ejected upwards or sidewards,strong infrared radiation occurs at some viewing directions.

     

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