The BMW AVZ Wind Tunnel Center

Duell, Edward; Kharazi, Amir A.; Muller, Sam; Ebeling, Welf; Mercker, E.

doi:10.4271/2010-01-0118

Cited by 39 publications

(19 citation statements)

References 16 publications

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“…6) allows the secondary boundary system equipment (fans, valves, ductwork, etc.) to remain stationary upstream of the turn table rather than being integrated into (and rotating with) a much larger conventional turn table [3,4,5]. Either approach is usually workable, but the double-radius turn table is a good solution for small test sections because space is at a premium and not all of the auxiliary equipment scales down with the size of the test section.…”

Section: Balance and Moving Ground Planementioning

confidence: 97%

“…The effect is normally worse with distributed porous suction compared to slot suction because the former represents a sink that disturbs the pressure field over a much larger region to achieve the same boundary layer performance. The present approach, combining a small amount of slot suction to remove the boundary layer build-up downstream of the primary slot, followed immediately by blowing, has been shown in recent designs [3,4] to provide a flat static pressure gradient over the front portion of the test section. A computational simulation was used to size the suction and blowing fans in the system, predict the boundary layer behavior downstream at the model location, and check the pressure field above the floor.…”

Section: Figure 4 Primary Suction Scoop and Secondary Suction And Blmentioning

confidence: 98%

“…1. While airline details are always different, the overall philosophy employed in the design of the airline components is the same as in other efforts [1,2,3,4,5]. Fundamentally, the approach is to minimize the circuit footprint (capital cost) while taking extreme care not to create flow separations and other instabilities throughout the circuit, which can then be only partially cleaned up in the flow conditioning section at the cost of increased fan power and circuit length.…”

Section: Airlinementioning

confidence: 98%

“…The model center of rotation is 2.1 m downstream of the nozzle exit plane. The collector design is similar to an existing system [3], which was developed with the aid of extensive scale model and computational simulations [6]. The suction side of the airfoil shape faces inward, working to reduce the pressure as the flow approaches it, even while it must finally increase as the collector area is larger than the jet's potential core.…”

Section: Figure 2 View Into the Swt Test Section From The Control Roommentioning

confidence: 99%

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The Honda R & amp;D Americas Scale Model Wind Tunnel

McKillen¹,

Walter²,

Geslin³

2012

SAE Int. J. Passeng. Cars - Mech. Syst.

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This paper describes the new Honda R&D Americas Scale Model Wind Tunnel (SWT). To help address Honda's ongoing need to improve fuel economy, reduce the driving force of a vehicle, and decrease product development time, the wind tunnel was developed and implemented to achieve high accuracy aerodynamic predictions for product development and a significantly improved capability for vehicle aerodynamics research. The SWT can accommodate model scales up to 50%. The ¾-open jet test section has a top speed of 250 km/h, a 5-belt moving ground plane with a long center belt for proper wake simulation, a test section designed specifically for very low static pressure gradient, three separate dynamic pressure measurement systems for state-of-the-art blockage corrections, and an overhead traverse for specialized measurement activities. This paper describes the decision process that led to the SWT, key commissioning results, and performance validation results with models installed. In addition, the paper describes a concurrent program within Honda to design and build scaled vehicle models that have spinning wheels, realistic engine cooling and underbody flows, and excellent geometric accuracy.

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Section: Balance and Moving Ground Planementioning

confidence: 97%

Section: Figure 4 Primary Suction Scoop and Secondary Suction And Blmentioning

confidence: 98%

Section: Airlinementioning

confidence: 98%

Section: Figure 2 View Into the Swt Test Section From The Control Roommentioning

confidence: 99%

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The Honda R & amp;D Americas Scale Model Wind Tunnel

McKillen¹,

Walter²,

Geslin³

2012

SAE Int. J. Passeng. Cars - Mech. Syst.

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“…Regarding the underbody flow, it is now more or less common practice to use a central moving belt on the floor and wheel drive units which allow for wheel rotation to ensure better correlation with on-road conditions. In addition, various suction or blowing systems can be used to influence the floor boundary layer [2,3].…”

Section: Introductionmentioning

confidence: 99%

Vehicle Ride Height Change Due To Radial Expansion Of Tires

Čavoj¹,

Blaťák²,

Hejtmánek³

et al. 2015

Journal of Middle European Construction and Design of Cars

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In general, tire deformations caused by wheel rotation are not taken into account when developing vehicle aerodynamics. On the road the tires radially expand as speed increases, which affects the actual ride height of a vehicle. In turn this often increases the real aerodynamic drag compared to values obtained using CFD or a wind tunnel as the mass flow across the relatively rough underbody increases with ground clearance. In this study, on-road ride heights were measured while running a vehicle in a straight line with fixed velocity whilst the aerodynamic lift of the vehicle was determined in a wind tunnel. Subsequently, the relationships between ride height and axle load were obtained by loading the vehicle at standstill with ballast. By comparing the ride heights at high and very low velocities with expected vertical displacement caused purely by aerodynamic lift force as computed according to the ride height -axle load equations, the ride height change due to tire radial expansion was determined.

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