The Driveability Test Facility Wind Tunnel No. 8

Walter, Joel; Duell, Edward; Martindale, Bill; Arnette, Stephen A.; Nagle, Paul; Gulker, William; Wallis, Stan; Williams, Jack E.

doi:10.4271/2002-01-0252

Cited by 31 publications

(5 citation statements)

References 5 publications

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“…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 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: Airlinementioning

confidence: 98%

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

McKillen¹,

Walter²,

Geslin³

2012

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

Self Cite

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“…Owing to the recirculation of the air in the tunnel, the temperature in the tunnel can rise significantly during a long testing session and this can affect clay models and also aeroacoustic measurements, for example by affecting the compliance of the door seals. Therefore, some tunnels incorporate a heat exchanger to control the tunnel conditions, for instance Walter et al (2002). The advantages of an open-return tunnel are the converse of the closed tunnel's disadvantages.…”

Section: Wind Tunnel Configurationsmentioning

confidence: 99%

“…Audi, Wickern and Lindener (2000); BMW, von Heesen et al (1996); Chrysler, Walter et al (2003); DNW, Mercker and Pengel (1994); Ford (Europe), Volkert and Kohl (1987); Ford (US), Walter et al (2002); GIE S2A, Waudby-Smith et al (2004); Hyundai, Kim et al (2001); IVK/FKFS, Potthof et al (1994), Künstner et al (1995); Pininfarina, Cogotti (2006) Wall treatment is used to achieve two objectives. The first is to provide an anechoic environment within the test section, to create a close-to free-field environment by reducing the reverberation and reflection of sound waves from the noise sources of the vehicle.…”

Section: Aeroacousticsmentioning

confidence: 99%

The Effects of Unsteady On-Road Flow Conditions on Cabin Noise

Oettle¹,

Sims-Williams²,

Dominy³

et al. 2010

SAE Technical Paper Series

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On-road, a vehicle experiences unsteady flow conditions due to turbulence in the natural wind, moving through the unsteady wakes of other road vehicles and travelling through the stationary wakes generated by roadside obstacles. There is increasing concern about potential differences between steady flow conditions that are typically used for development and the transient conditions that occur on-road. This work considers whether steady techniques are able to predict the unsteady results measured on-road, the impact of this unsteadiness on the noise perceived in the cabin and whether minor changes made to the geometry of the vehicle could affect this. Both external aerodynamic and acoustic measurements were taken using a full-size vehicle combined with measurements of the noise inside the cabin. Data collection took place on-road under a range of wind conditions to accurately measure the response of the vehicle to oncoming flow unsteadiness, with steady-state measurements taking place in full-scale aeroacoustic wind tunnels.Overall it was demonstrated that, using a variety of temporal and spectral approaches, steady techniques were able to predict unsteady on-road results well enough to assess cabin noise by correctly taking into account the varying on-road flow conditions. Aerodynamic admittance values remained less than unity in the sideglass region of the vehicle, with the exception of the the region nearest the A-pillar. The reducing unsteady energy at frequencies greater than 10 Hz, combined with the corresponding roll-off in admittance, implies that unsteady frequencies below 10 Hz affect the vehicle most, where the response remains quasi-steady.Quasi-steady cabin noise simulations allowed a subjective assessment of the predicted unsteady cabin noise, where the impact of cabin noise modulations were quantified and found to be important to perception. Minor geometry changes affected the sensitivity of cabin noise to changes in yaw angle, altering modulation and therefore having an important impact on the unsteady wind noise perceived on-road.iii DeclarationThe work in this thesis is based on research carried out at the School of Engineering and Computing Sciences, Durham University, UK. No part of this thesis has been submitted elsewhere for any other degree or qualification and it all my own work unless referenced to the contrary in the text.

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“…Specific examples of these phenomena, shown in Especially, fluctuations induced by the acoustic resonances of the whole circuit are generally called acoustic resonance components or tunnel mode components (1)(2)(3)(4)(5)(6)(7). These are related to the wind speed and often increase to become serious problems such as pulsations at particular wind speeds.…”

Section: Introductionmentioning

confidence: 99%

Techniques for Reducing Low-Frequency Fluctuations in Aeroacoustic Wind Tunnels

Kudo

Komatsu

Maeda

et al. 2009

JEE

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Aeroacoustic wind tunnels, which consist of large measuring sections, such as anechoic rooms, and open jets, are generally applied as test facilities to measure aerodynamic noise generated around vehicles. In aeroacoustic wind tunnels, it is easy to generate flow-induced low-frequency fluctuations resulting in pressure fluctuations or velocity fluctuations associated with vortices or turbulence in the open jet. These low-frequency fluctuations are generated by various flow-induced phenomena, such as swaying that occurs in various elements of the circuit, fluctuations propagated from the shear layers or mixing layers of the open jet, and the acoustic resonances of the whole circuit, which often become serious problems, generally called pulsations, at particular wind speeds. Because these low-frequency fluctuations may affect the measured pressure and velocity of a flow around vehicles in measuring sections, we should aim to reduce or control them when designing aeroacoustic wind tunnels to ensure measurement with high reliability. In this study, we investigate the generating mechanisms and techniques for reducing these low-frequency fluctuations in aeroacoustic wind tunnels by performing experiments on a model wind tunnel. In particular, new techniques for reducing acoustic resonance components such as by installing an acoustic opening in the circuit are proposed and verified by simulations and experiments. Using these techniques for reducing low-frequency fluctuations, the fluctuations of pressure and velocity in the measuring section are markedly decreased over the entire wind speed range.

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The Driveability Test Facility Wind Tunnel No. 8

Cited by 31 publications

References 5 publications

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

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

The Effects of Unsteady On-Road Flow Conditions on Cabin Noise

Techniques for Reducing Low-Frequency Fluctuations in Aeroacoustic Wind Tunnels

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