关键词: 射流矢量偏转, 气动矢量喷管, Coanda效应, 流动耦合, 控制规律

Abstract: Fluid thrust vector technology has become the focus of advanced research technology of future aircraft because of its simple structure and rapid response, and aerodynamic vector nozzle is the core component of this technology. In this paper, an axisymmetric aerodynamic vector nozzle with four-direction deflection is designed and optimized based on the wall-attached jet vector deflection technology, and numerical simulation, flow display experiment and ATI force vector angle measurement experiment are carried out. At the same time, the flow field change of jet coupling deflection at two-way opening outlet, the deflection effect of curved wall at different Reynolds numbers and the control law of axisymmetric aerodynamic vector nozzle are studied. Using numerical simulation technology, the maximum deflection of flow vector angle is about 30 when the outlet wind speed is about 50m/s, and compared with the experimental results of smoke flow, the smoke flow experiment shows that the maximum flow vector angle of this type of vector nozzle can be about 27 when the outlet wind speed is about 50m/s; The oil flow experiment shows that the effect of attaching the wall is not good and the deflection is unstable. From the force vector angle measurement experiment of ATI balance, it can be seen that the deflection of the aerodynamic vector nozzle with curved wall design is small when the outlet velocity of the jet increases. Therefore, the method of curved design in front of the wall and oblique design in the back makes the jet easy to deflect when the outlet velocity is low and stable to attach to the wall when it is high. Finally, when the outlet wind speed of the nozzle jet is 80m/s, the vector angle of pitching opening force deflects between-12 and 13, and the vector angle of lateral opening force deflects between-10 and 11, with good linearity.

Key words: jet vector deflection, aerodynamic vector nozzle, Coanda effect, flow coupling, control law