Automotive Testing in the German-Dutch Wind Tunnels

Willemsen, E.; Pengel, K.; Holthusen, Herman; Küpper, A.

doi:10.5772/13177

Cited by 3 publications

(2 citation statements)

References 12 publications

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“…This is despite strong evidence from existing work citing its importance (together with a moving ground) for accurate reproduction of realistic flow conditions (Burgin et al 1986;Söderblom et al 2009Söderblom et al , 2012Wickern et al 1997;Waeschle 2007). Devesa and Indinger (2012), Le Good et al (1998), and Willemsen et al (2011) all found drag reductions with wheel rotation with Wiedemann (1996) highlighting body-shape, and Willemsen et al (2011) ride height, as defining influences. Söderblom et al (2009Söderblom et al ( , 2012 also observed reduced inner wheel housing static pressures with rotating wheels, as well as modifications to the local flow both upstream and downstream; the consequence of which modifies subsequent downstream structures.…”

Section: Introductionmentioning

confidence: 82%

“…The influence of wheel rotation is another aspect generally omitted (Hucho and Sovran 1993;Willemsen et al 2011). This is despite strong evidence from existing work citing its importance (together with a moving ground) for accurate reproduction of realistic flow conditions (Burgin et al 1986;Söderblom et al 2009Söderblom et al , 2012Wickern et al 1997;Waeschle 2007).…”

Section: Introductionmentioning

confidence: 99%

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Influence of Rotating Wheels and Moving Ground Use on the Unsteady Wake of a Small-Scale Road Vehicle

Rejniak

Gatto

2020

Flow Turbulence Combust

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New insights into how different ground simulation methods affect road vehicle aerodynamics are presented. Experiments are conducted on a 1/24th-scale model, representative of a Heavy Goods Vehicle, at a Reynolds number, based on width of 2.3 × 10 5. Particular focus lay in characterising differences in unsteady wake development, with mean drag, base pressures, and wake velocities quantified, compared, and evaluated. Distinctly, these tests include the effects of elevated blockage ratio and wheel rotation. Results show moving ground use can have a substantial influence under these conditions, with increases in wake length and average base pressure coefficient of 17% and 9%, respectively. The dominant wake dynamics, characterised by a global streamwise oscillation commonly referenced as the bubble pumping mode, was also found dependent with asymmetric shedding frequencies from both vertical and horizontal base edges higher with static ground use. For these conditions, development of a low-frequency turbulence source, near omni-directional in nature, positioned behind the model, further contaminates the flow-field. This feature disappears with moving ground use. Both the nature and characteristics of the turbulence generated behind the wheels were also found to evolve differently, with a moving ground promoting stronger and more defined oscillatory behaviour up to model mid-height, two-and-a-half widths downstream. Overall, these results highlight that while variations in time-independent quantities to differing ground simulation can often be very subtle, prompting the interpretation of negligible overall effects, in-depth consideration from a time-dependent perspective may lead to a different conclusion.

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Section: Introductionmentioning

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Influence of Rotating Wheels and Moving Ground Use on the Unsteady Wake of a Small-Scale Road Vehicle

Rejniak

Gatto

2020

Flow Turbulence Combust

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Numerical Modelling of Wind Tunnel Internal Flow for CFD Assisted Design

Kesharwani

Mistry

Roy

et al. 2022

J. Inst. Eng. India Ser. C

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Instrumentation and Ground Testing of a Composite Elastic Wing Wind Tunnel Model

Keimer

Giannaros

Kilimtzidis

et al. 2022

IOP Conf. Ser.: Mater. Sci. Eng.

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The Goal of the Project GRETEL is to build a composite elastic wing wind tunnel model. This model incorporates morphing aerodynamical structures and is to be delivered for testing in the Large Low speed Facility (LLF) wind tunnel of DNW. In order to be allowed to be tested in a wind tunnel, a ground test is required to assure the integrity of the design of the wing. In this paper a short introduction to the overall setup of the model is given including an overview of integrated sensors. A short introduction into the different configurations of the wing to be tested is given as well as the rationale for the derived test-matrix of the ground tests. The mechanical setup for the ground tests is described. There are two main tests done, on the one hand the static tests of the wingbox, on the other hand the dynamic tests for determination of modal parameters of the model in its different configurations. The static tests are done to identify mechanical responses of the model as built and compare them to the predictions of the Finite Element simulations. The method to derive the boundary conditions, i.e. loads and deformations, for the static tests from the simulation is documented and discussed. The static tests are also used to calibrate the integrated strain gauges to enable load monitoring in the wind tunnel tests. First experimental results from the ground tests are shown and discussed, comparing them to predictions from the simulation.

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Automotive Testing in the German-Dutch Wind Tunnels

Cited by 3 publications

References 12 publications

Influence of Rotating Wheels and Moving Ground Use on the Unsteady Wake of a Small-Scale Road Vehicle

Influence of Rotating Wheels and Moving Ground Use on the Unsteady Wake of a Small-Scale Road Vehicle

Numerical Modelling of Wind Tunnel Internal Flow for CFD Assisted Design

Instrumentation and Ground Testing of a Composite Elastic Wing Wind Tunnel Model

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