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Zhang Y.-P.,Xian Aircraft Design and Research Institute | Duan Z.-Y.,Xian Aircraft Design and Research Institute | Zhang Y.-J.,Xian Aircraft Design and Research Institute
Kongqi Donglixue Xuebao/Acta Aerodynamica Sinica | Year: 2012

The aerodynamic characteristics under the cruise condition of the whole configuration will benefit from well-designed wing. Continuous adjoint method can be used to complex configuration because the computation of the sensitivity derivatives of cost function with respect to design variables is nearly independent with the number of design variables. Based on the adjoint method, the problem of drag minimization of wing with viscosity is studied in present paper. The flow control equation and the adjoint equation are solved numerically with a finite volume fourth-order-accurate compact scheme for spatial discretization and Runge-Kutta integration for time advancement. Finally, an effective three-dimensional wing optimization aiming at some important project is carried out in this paper. Source


Wu N.,Xian Aircraft Design and Research Institute | Duan Z.-Y.,Xian Aircraft Design and Research Institute | Liao Z.-R.,Xian Aircraft Design and Research Institute | Deng Y.-J.,Xian Aircraft Design and Research Institute
Kongqi Donglixue Xuebao/Acta Aerodynamica Sinica | Year: 2012

With flat after-body, large cargo aircraft have simpler structures, less weight, and the port machine has high dependability. However, the flat after-body induces strong transverse flow and flow with high adverse gradient when the aircraft cruises, so the boundary layer on the after-body is easier to separate. Separated flow increases pressure drag, and the separated vortex worsen the pressure distributions on the both side of vertical tail when the aircraft yaws. So the yawing stability is reduced. The chine is a special aerodynamic device which is used on flat after-body. It can restrain the birth and development of vortex flow. When the aircraft yaws, the chine can also enhance yawing stability by improving pressure distributions on the surfaces of vertical tail and after-body. Because of the functions of drag reduction and stability enhancement, the chine makes the transport aircraft with flat after-body having both high load efficiency and satisfied aerodynamic performance. Source

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