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Yuan X.-X.,China Aerodynamics Research And Development Center | Yuan X.-X.,Key Laboratory for Track Traffic Safety of Ministry Education CSU | Yang M.-Z.,Key Laboratory for Track Traffic Safety of Ministry Education CSU | Xie Y.-F.,Key Laboratory for Track Traffic Safety of Ministry Education CSU | Wang W.-Z.,Key Laboratory for Track Traffic Safety of Ministry Education CSU
Kongqi Donglixue Xuebao/Acta Aerodynamica Sinica | Year: 2010

Screens and metal grids are commonly used to adjust the flow in the design of wind tunnels. While the flow across the screen is rather complicated, the design and optimization of the screen are generally conducted by experiences and investigating experiments. With the development of CFD techniques, the screen flow could be solved although it still remains a big challenge. A computational boundary model considering the macro-effects of the screen was built up, which ignored the flow details across the numerous small holes of the screen. By this way, the computational grids and times could be dramatically reduced. The model was preliminarily tested in the computation and combined with the investigating experiments conducted for the 2m×2m supersonic wind tunnel design, and its effect is noticeable. Source


Yuan X.-X.,China Aerodynamics Research And Development Center | Yuan X.-X.,Key Laboratory for Track Traffic Safety of Ministry Education CSU | Yang M.-Z.,Key Laboratory for Track Traffic Safety of Ministry Education CSU | Xie Y.-F.,China Aerodynamics Research And Development Center | Yang Y.-G.,China Aerodynamics Research And Development Center
Kongqi Donglixue Xuebao/Acta Aerodynamica Sinica | Year: 2010

The inner flowfields of the big open diffuser composed of a pointed cone for separate flow and two screens in five combinations are numerically studied, which were conducted for the 2m×2m supersonic wind tunnel design test analysis. There are hundreds of or even thousands of small holes on the screen, which makes the flow across the screen very difficult to be computed directly by CFD method. To overcome this problem, a boundary model for the flow across screen was built up. Another key technique in the CFD process is the accurate treatment of the inflow and outflow boundary. The numerical results show that the pointed cone can control the separation effectively near the wind tunnel wall, but strong vortex is generated behind the cone base, then the flow get across the screen with big total pressure loss, but the streamlines become straight. The effect was as expected. Source

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