Study on dynamic stall control strategy based on dual synthetic jets

Dynamic stall has always been a key problem restricting the improvement of aircraft maneuverability. In this paper, the application potential of dual synthetic jets (DSJ) technology in dynamic stall control is studied. The influence of different momentum coefficients and action positions on the control effect is analyzed, and the aerodynamic control characteristics and the accompanying flow field evolution are explained. DSJ technology can improve the dynamic stall flow field environment. When the control is continuously applied at a single position throughout the pitching process, leading edge DSJ performs best, the middle DSJ is followed, and trailing edge DSJ only increases the lift during the upstroke process. Based on the above research results, a new dynamic stall control concept-the trade-off control concept is introduced, and three new control strategies, optimal control, trade-off control, and separation control, are proposed. The three control strategies have achieved better effect of increasing lift. For the whole pitching process, the average lift coefficient is increased by 19.72%, 20.98%, and 22.63%, respectively. For the downstroke process, the average lift coefficients of the three control strategies are increased by 45.30%, 48.91% and 54.56%, respectively. Among these strategies, the trade-off control concept achieves the best lift increase in the upstroke process, and the separation control concept is more effective for the control of the whole pitching process.