| Citation: | LEI Yuchang, ZHANG Dengcheng, ZHANG Yanhua, et al. Effect of pulsed jet on aerodynamic performance of circulation control airfoil[J]. Journal of Beijing University of Aeronautics and Astronautics, 2022, 48(3): 485-494. doi: 10.13700/j.bh.1001-5965.2020.0560(in Chinese)
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The aerodynamic performance of steady jet is poor at high angle of attack. With the help of pulsed jet, the aerodynamic performance at high angle of attack can be effectively improved and the mass flow rate of jet can be reduced. The unsteady numerical simulation method is used to calculate the aerodynamic characteristics and analyze the flow field of the circulation control airfoil under pulsed jet. The effects of duty cycle and frequency on the amplitude of time-averaged lift and lift pulsation are summarized. The flow mechanism of pulsed jet at different angles of attack is analyzed. Furthermore, the influence law of jet momentum coefficient is pointed out, and the lift pulsation phenomenon is effectively alleviated with the help of the superposition effect of pulsed jet and steady jet. The results show that, under low duty cycle, the pulsed jet can greatly reduce the mass flow rate under the same lift coefficient, but the amplitude of lift pulsation is larger at the same time. At low angle of attack, the lift coefficient increases at first and then decreases with the increase of frequency, but the overall change is not obvious, and at high angle of attack, the lift coefficient increases continuously with the increase of frequency. The pulsed jet can delay the stall angle of attack and widen the angle of attack, and this advantage becomes more obvious with the increase of momentum coefficient. With the help of the superposition effect of the pulsed jet and the steady jet, the lift pulsation under the pulsed jet can be effectively alleviated and the flight conditions can be achieved.
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