SESSION 2 - Wind tunnel infrastructure; latest and greatest from the auto industry

Dr Edward Duell, Sr. Aeroacoustics Engineer, BMW/Jacobs Engineering, Germany

SESSION 2 - Aerodynamic Innovations at the BMW AVZ Wind Tunnel Center

BMW/Jacobs Engineering

The new BMW Aerodynamisches Versuchszentrum (AVZ) test center features two 300kmh, open-jet, wind tunnels capable of full-scale vehicle tests and a 32,000m2 support building with space for workshops, vehicle preparation, and offices. The AVZ center incorporates several new aerodynamic technology features. These features include a single-belt rolling road and a five-belt rolling road for underbody aerodynamic simulation. Each rolling road type has distinct advantages that can be leveraged for particular test goals. To accurately simulate ‘on-road’ aerodynamic forces, a novel collector / flow stabilizer was developed that produces a very flat axial static pressure (dCp/dx) distribution. The flat static pressure distribution represents a significant improvement relative to other open-jet wind tunnels.

Additionally, Helmholtz resonators were planned into the design and tuned to passively and effectively reduce low frequency open-jet plenum pressure fluctuations. A unique test capability to study vehicle drafting and dynamic overtaking maneuvers is possible with the use of two overhead traverses in one test section. Additionally, the effect of the circuit design on producing low levels of turbulence is discussed. The wind tunnels are considered by the automotive industry to be “next generation” due to the significant technical developments that provide design engineers with new tools for aerodynamic optimization of vehicles.

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