The Interior Design of a 40% Scaled DrivAer Body and First Experimental Results

Abstract

This report addresses the interior design of a 40% scaled wind tunnel model of a generic medium-sized car geometry — the so-called DrivAer body. The model was designed for being investigated inside the wind tunnel facility at the Technische Universität München, which was recently upgraded by a single-belt ground simulation system. The wind tunnel model is very modular: it features several exchangeable parts, such as three exchangeable rear ends, three different underbody configurations, and different wheel rim geometries. In addition to this, the engine compartment is equipped with a model heat exchanger to adjust the mass flow rate through the underhood area. Apart from the model itself, we would also like to introduce some of the measurement equipment that we used during our wind tunnel tests, for example a set of five independent force balances. Furthermore, a method to account for the falsifying rolling resistance of the wheels is shown. Finally, results of experiments to determine the aerodynamic drag generated at the front and the rear axes of the vehicle will be discussed and a small data base of drag values for various vehicle configurations will be provided.

Experimental Comparison of the Aerodynamic Behavior of Fastback and Notchback DrivAer Models

“…More detailed information regarding the model's design is provided by Heft et al [4]. Other studies also consider more complex model variations such as applied engine compartment flow with heat exchanger and under floor interactions [3]. The geometry of the DrivAer model is openly available for the research community.…”

Systematic Optimization of the Cooling Duct System of Electric Vehicles

“…More details on the model can be found in Heft et al 5,6 During a preceding investigation by Mack et al,7 the DrivAer model has already been used to investigate different cooling configurations for ICE vehicles. In contrast to the investigations by Mack et al, 7 we make the assumption that the whole cooling architecture of the BEV is placed in the rear of the vehicle. Therefore, typical placement of the inlet at the high pressure zone at the front of the vehicle becomes complicated, due to the tight available space.…”

On the Aerodynamics of an Enclosed-Wheel Racing Car: An Assessment and Proposal of Add-On Devices for a Fourth, High-Performance Configuration of the DrivAer Model

“…An overhead model mounting strut systemsimilar to [19] [20][21]is adopted, with addition of a 'tail-strut' for model pitch adjustment and remote adjustment of the model ride height. The model is connected to the strut by an internal, 6 component strain gauge balance.…”

“…Measurements were made at five freestream flow velocities (20,25,30,35, 40 / , corresponding to Reynolds numbers of 2.07, 2.59, 3.11, 3.63, 4.15 × 10 6 , respectively. Three model ride heights (ℎ/ℎ 0 = 0.25, 1.00, and 2.00) were tested at each Reynolds number.…”