Fluid-Dynamic Force Measurement of Ahmed Model in Steady-State Cornering

The effects of on-road disturbances on the aerodynamic drag are attracting attention in order to accurately evaluate the fuel efficiency of an automobile on a road. The present study investigated the effects of cornering motion on automobile aerodynamics, especially focusing on the aerodynamic drag. Using a towing tank facility, measurements of the fluid-dynamic force acting on Ahmed models during steady-state cornering were conducted in water. The investigation included Ahmed models with slant angles θ = 25° and 35°, reproducing the wake structures of two different types of automobiles. The drag increase due to steady-state cornering motion was experimentally measured, and showed good agreement with previous numerical research, with the measurements conducted at a Reynolds number of 6 × 105, based on the model length. The Ahmed model with θ = 35° showed a greater drag increase due to the steady-state cornering motion than that with θ = 25°, and it reached 15% of the total drag at a corner with a radius that was 10 times the vehicle length. The results indicated that the effect of the cornering motion on the automobile aerodynamics would be more important, depending on the type of automobile and its wake characteristics.

Heat Exchangers Modeling using Industrial Wind Tunnel Simulation for Automobile Industry

In the industry 4.0 eras, it is necessary to analyze each parameter precisely. In case of heat transfer studies, the automobile and aerodynamic industry is gaining more and more attention. Many heat exchangers are designed and tested in industry but for any specific product thermal characteristics can be different which depends on the scenario of use of that product. Heat exchangers can test with fluid, air etc. For internal machines like bearing cooling fluid can be used but in case of automobile, aerodynamics air flow is important element. This paper presents the simulation and analytical modeling of various heat exchangers. This can be very useful for lowering the insulation damages or foil damages of vehicle. The wind tunnel test is carried with constant wind flow to assure that vehicle speed and cooling can be moderate without issue of cooling.