The present paper deals with the computational flow simulation and analysis of NACA (National Advisory Committee for Aeronautics) shape based cooling air inlets for road vehicles. A suitable testing geometry was chosen and built up in hardware to gather experimental data for validation. A CFD simulation process was defined and validated using experimental pressure distributions in the ducting. Then, the total pressure deficit of the inlet flow was evaluated for a wide range of different geometric configurations. About 30 CFD runs were accomplished. The study investigates how geometric properties like aspect ratio, slant angle, lip and bounding surface shape and edge radius affect the flow quality. Furthermore, boundary layer thickness and angular yaw position of the ducting are taken into account. It can be seen that small slant angel, large edge radii, thin boundary layers and small yaw angles lead to small pressure deficits. With these results, a proposal for an optimal NACA duct shape can be given for each area of interest on the vehicle's surface.
CFD analysis of submerged air inlets for automotive application
2012
17 Seiten, 18 Bilder, 23 Quellen
Aufsatz (Konferenz)
Englisch
Numerical Analysis of Submerged Inlets
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