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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2012, Vol. 33 ›› Issue (11): 1967-1974.

• Fluid Mechanics and Flight Mechanics • Previous Articles     Next Articles

A New Fluidic Thrust Vectoring Technique Based on Ejecting Mixing Effects

XIAO Zhongyun1, GU Yunsong2, JIANG Xiong1, CHEN Zuobin1   

  1. 1. Computational Aerodynamics Institute, China Aerodynamics Research and Development Center, Mianyang 621000, China;
    2. College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
  • Received:2011-12-29 Revised:2012-02-05 Online:2012-11-25 Published:2012-11-22

Abstract: Fluidic thrust vectoring is a technology aiming at deflecting exhaust nozzle jets by flow control. To overcome the shortcomings of existing fluidic thrust vectoring techniques which use secondary flows, a new exhaust nozzle is proposed which produces pressure gradients within the collar by ejecting mixing effects, forces the nozzle jets to deflect and produce thrust vectoring. The pressure on one collar can be conditioned by mass flux limitation while on the other remains unvaried; thus different pressure gradients are formed, and thrust vectoring is achieved. Based on this, a rectangular exhaust nozzle is designed, and numerical simulation is performed to investigate the flow mechanism and compute the aerodynamic characteristics such as vectoring efficiency, thrust loss, etc. Results show that the maximum vectoring angle of the nozzle is 24°, which corresponds to jet attachment on one collar, while the controllable vectoring angles are in the range of 0° to 13°, and the thrust losses vary between 1.5% and 7.0% depending on jet vectoring angles. According to the computation, a 1∶10 sub-scale model is made and exhaust nozzle experiments are conducted using a high pressure gas tank. In the experiments jet vectoring are achieved under the design conditions, which testifies in principle the feasibility of the thrust vectoring scheme.

Key words: thrust vectoring, exhaust nozzle, numerical simulation, ejecting mixing, thrust loss

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