脉冲吹气对无缝襟翼翼型气动性能的影响

doi:10.7527/S1000-6893.2018.22118

Abstract

Abstract: Only when small enough energy input can obtain greater aerodynamic performance gains, and the flow control technology can be widely used in the real aircraft. Compared with steady blowing, pulse blowing needs less energy and results in more efficient control effect, so it is more used in lift enhancement. The effect of pulse frequency, duty cycle and moment coefficient on the aerodynamic characteristics of a slotless flap airfoil is studied by numerical simulation. The results show that the optimal pulse frequency for lift increment approximately equals the vortex shedding frequency, the drag increases when the pulse frequency is lower than the vortex shedding frequency, and the optimal pulse frequency for drag reduction is about twice the optimal lift increment frequency. When the moment coefficient is small, lift increases with the decrease of the duty cycle. When the moment coefficient is lower than the critical moment coefficient, pulse blowing is more sufficient to improve lift performance, but when the moment coefficient is higher than the critical moment coefficient, steady blowing is the best choice. The investigation can provide some reference for using periodic excitation to increase lift, reduce drag and enhance maneuvering surface efficiency in the design of aircraft.

Key words: pulse blowing, slotless flap airfoil, flow control, lift enhancement, drag reduction

CLC Number:

V211.4

WANG Wanbo, JIANG Yubiao, HUANG Yong, YU Kunlong, ZHANG Xin. Influence of pulse blowing on slotless flap airfoil aerodynamic characteristics[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2018, 39(11): 122118-122129.

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Influence of pulse blowing on slotless flap airfoil aerodynamic characteristics

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