Detached-eddy simulations and analyses on new vortical flows over a 76/40° double delta wing  

作　　者：LI Qin SUN Dong ZHANG HanXin 

机构地区：[1]State Key Laboratory of Aerodynamics [2]China and National Laboratory of CFD,Beijing University of Aeronautics and Astronautics

出　　处：《Science China(Physics,Mechanics & Astronomy)》2013年第6期1062-1073,共12页中国科学：物理学、力学、天文学（英文版）

基　　金：sponsored by the National Natural Science Foundation of China (Grant No. 91016001)

摘　　要：Numerical simulations were performed on the massively separated flows of a 76/40° double delta wing using detached-eddy simulation(DES).A new type of cross-flow vortex is suggested.A vortex was initially generated near the junction of the strake and wing,which then moved towards the wing tip at certain wavelength and speed.Analyses were made in detail on the mechanism of the generation of the cross-flow vortex,that is,the inviscid cross-flow instability which differs from that of the swept blunt wing.Cross-section topology of the cross-flow vortex is also investigated,and the wavelength of the vortex array and the characteristic frequency are given.The analyses showed that the cross-flow vortices have an influence on the pressure distribution,which can cause a 10%-20% deviation from the averaged distribution.Numerical simulations were performed on the massively separated flows of a 76/40° double delta wing using detached-eddy simulation（DES）.A new type of cross-flow vortex is suggested.A vortex was initially generated near the junction of the strake and wing,which then moved towards the wing tip at certain wavelength and speed.Analyses were made in detail on the mechanism of the generation of the cross-flow vortex,that is,the inviscid cross-flow instability which differs from that of the swept blunt wing.Cross-section topology of the cross-flow vortex is also investigated,and the wavelength of the vortex array and the characteristic frequency are given.The analyses showed that the cross-flow vortices have an influence on the pressure distribution,which can cause a 10%-20% deviation from the averaged distribution.

关 键 词：double delta wing massively separated flows cross-flow instability vortex substructures DES 

分 类 号：O35[理学—流体力学]