Volume 32 Issue 11
Nov.  2017
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Improvement of powered lifting scheme on the saggingcharacteristic of blendedwingbody aircraft[J]. Journal of Aerospace Power, 2017, 32(11): 2752-2760. doi: 10.13224/j.cnki.jasp.2017.11.024
Citation: Improvement of powered lifting scheme on the saggingcharacteristic of blendedwingbody aircraft[J]. Journal of Aerospace Power, 2017, 32(11): 2752-2760. doi: 10.13224/j.cnki.jasp.2017.11.024
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Improvement of powered lifting scheme on the saggingcharacteristic of blendedwingbody aircraft

doi: 10.13224/j.cnki.jasp.2017.11.024
  • Received Date: 2016-11-02
  • Publish Date: 2017-11-28
    Abstract
  • Blendedwingbody aircraft frequently shows the sagging phenomenon, which is a safety sensitive problem in takeoff and landing. Focusing on the problem, a powered lifting scheme by use of ductedfan in wings was presented. Aerodynamic effect of the powered lifting system on flight was analyzed. A matched design and assessment method for the powered lifting system was established, and the main constraints of the layout were integrated. Taking the thrust weight ratio of the system, pitching trim, maneuverability and stability into consideration, a blendedwingbody drone was used as example and the powered lifting system and its layout scheme were presented. For smooth transition of flight phases, an attitude stabilization control law was further introduced. Flight tests show that the powered lifting device can mitigate the sudden increase of sink rate and height sagging phenomenon due to elevator deflection in approaching stage. Meanwhile, the scheme can reduce the takeoff and landing velocity by over 20%, and the scheme is apt to be implemented on small size of blendedwingbody aircraft.

     

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