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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2020, Vol. 41 ›› Issue (12): 124434-124434.doi: 10.7527/S1000-6893.2020.24434

• Fluid Mechanics and Flight Mechanics • Previous Articles     Next Articles

Canard aircraft interactive behaviors between vectoring jet and aerodynamics at high angles of attack

WEI Zhongcheng1,2, WANG Haifeng2, YUAN Bing2, LI Yingying2   

  1. 1. School of Aeronautic Science and Engineering, Beihang University, Beijing 100083, China;
    2. AVIC Chengdu Aircraft Design and Research Institute, Chengdu 610091, China
  • Received:2020-06-19 Revised:2020-07-12 Published:2020-07-27

Abstract: An experimental study on single-engine canard aircraft interactive behaviors between the vectoring jet and aerodynamics at high angles of attack is conducted in a low-speed wind tunnel. The test results indicate that increase in the engine nozzle diameter can enhance the lift and drag coefficient and produce pitch down moment at high angles of attack. Jets can significantly increase the lift and drag coefficient and also produce pitch down moment at high angles of attack. However, the increment of lift or drag and decrease of pitching caused by the jet is 50% less in case of a small nozzle than in case of a large nozzle. When the vectoring engine nozzle is deflected upward or downward, the airflows induced by the vectoring jets on the upper and lower surfaces of the aircraft are asymmetrical. The lift and drag coefficient decrease and the pitching moment increases when the jet is deflected upward, and the opposite is true when the jet is deflected downward. In addition, the effect of jets deflecting downward is noticeably larger than that of jets deflecting upward. Based on this, the flow field mechanism of interactive behaviors between the vectoring jet and the main flows is analyzed by numerical simulation.

Key words: canard configurations, vectoring jets, wind tunnel experiments, high angles of attack, aerodynamics

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