| Citation: | ZHANG Dong, CHEN Yong, HU Mengquan, et al. Effect of strake and canard on aerodynamic characteristics of forward-swept wing and back-swept wing[J]. Journal of Beijing University of Aeronautics and Astronautics, 2019, 45(10): 2058-2068. doi: 10.13700/j.bh.1001-5965.2019.0030(in Chinese)
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In order to analyze the reasons why the design of forward-swept wing aerodynamic configuration cannot be popularized and applied in aviation industry, simplified strake-wing, canard-wing and strake/canard-wing configurations were constituted by fixing strake and canard on forward-swept wing and back-swept wing, so as to deeply understand the flow characteristics and the mechanism of vortices interference between the two different configurations of forward-swept wing and back-swept wing. and First, the reliability and accuracy of numerical computation method were validated by comparing the computing results with experimental data of a standard model. Then, the lift coefficient curves of different configurations were obtained through numerical computation. Finally, the complex vortex interaction mechanism of different configurations were analyzed by pressure contours and streamlines. The results indicate that induction and convolution between vortexes of configurations based on back-swept wing enhance the lift coefficient and increase stalling angle of attack, and the effect was more apparent on the configuration fixed with strake and canard. There is no convolution effect between vortices of configurations based on forward-swept wing, and vortexes of configurations based on forward-swept wing perform an adverse interaction by bumping and squeezing, which makes the lift coefficient of the forward-swept wing much lower than that of the back-swept wing at high angles of attack. The leading-edge vortices of the forward-swept wing cannot be coupled with the canard wing vortices and strake vortices at high angles of attack, and cannot make full use of the non-linear lift force, which is the shortcoming in the aerodynamic layout design of the forward-swept wing.
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