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- 검색키워드
- 저자 : Junqiang Bai (검색결과 2 건)
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Aerodynamic Design of the Supersonic Aircraft Wing-Shape and Wing-Twist Optimization
Li Li,Junqiang Bai,Tongbiao Guo,Xiaolong He,Ziyuan Fu 한국항공우주학회 2018 International Journal of Aeronautical and Space Sc Vol.19 No.2
This paper builds an aerodynamic optimization design system by coupling the free form deformation parameterization technique,thedynamicmeshtechniquebasedoninversedistanceweightinginterpolationmethodandparticleswarmoptimization algorithm,Krigingsurrogatemodel,withthecomputationalfluiddynamicssolverbasedonReynolds-averagedNavier–Stokes equations. And it carries out aerodynamic optimization designs with a supersonic transport aircraft configuration. The wing shape is parameterized by defining 60 design variables and the wing twist is by four design variables. Meanwhile, the wing thickness constraints are considered. Afterwards, a single-point optimization design aiming at minimum of the supersonic cruise drag is conducted, and in order to consider the transonic cruise condition, a multipoint aerodynamic optimization design aiming at minimum of a weighted drag for the supersonic cruise drag and transonic cruise drag is performed. The analyses of optimization results illustrate the specific drag reduction, the characteristics of pressure distributions for both the supersonic cruise condition and transonic cruise condition, and how the shock wave region and strength have improved on thesupersoniccruisecondition.Theoptimizationdesignthispaperpresentsrealizingthedragreductionisquitepracticaland effective, which is instructive in supersonic aircraft design.
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Yi Li,Yang Zhang,Junqiang Bai 한국항공우주학회 2020 International Journal of Aeronautical and Space Sc Vol.21 No.1
Aerial refueling technology has been widely applied in various fields and it is one of the hotspots but difficulties for the aeronautical technologies. DLR-F6 WBNP model is used as a tanker and a fighter model is used as a receiver. The flow field of Probe–Drogue refueling and Flying Boom refueling is numerically simulated using the Reynolds-averaged Navier–Stokes equations, and the effects of the jet flow and the aerodynamic characteristics of the receiver are taken into consideration. The results indicate that the effect of downwash of the tanker reduces the lift coefficient and decreases the pitching moment coefficient of the receiver. The jet flow of tanker increases the dynamic pressure while decreases the local angle of attack, which increases the pressure difference between the upper and lower surfaces of receiver. Compared with the results without jet, the jet flow can increase the lift and the drag of the receiver and reduces the pitching moment, and even cause the change of rolling moment direction. Therefore, engine jet is an important factor when simulating aerial refueling.
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