Aerodynamic characteristics of a monoposto racing car front wing operating in high turbulence conditions

Correia, José Manuel; Roberts, Luke S.; Finnis, Mark; Knowles, K.

doi:10.1533/9780081002452.6.225

Cited by 3 publications

(6 citation statements)

References 13 publications

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“…Validation was conducted by comparing the prediction of sectional forces and surface streamlines to the experimental results. Additionally, Correia et al [24] used the same turbulence model and a similar RANS method to that of the present study and showed good agreement with flow-field LDA measurements from the DS Houghton wind tunnel.…”

Section: Three-dimensional Rans Simulationssupporting

confidence: 75%

“…The two-dimensional simulation relies solely on pressure drag and skin friction drag, whilst the wing used in the experiments is also subject to vortex-induced drag from the wing tips. Such vortices also contribute to downforce as they induce a suction on the lower surface of the wing [24]. Zhang, et al [24] also showed that at higher ground clearances a concentrated vortex core occurs, but at a lower ground clearance it bursts, though the wing does not necessarily enter the forcereduction region, and its contribution to downforce reduces and contribution to drag increases.…”

Section: Meses (2d) Computational Resultsmentioning

confidence: 99%

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Forcing Boundary-Layer Transition on a Single-Element Wing in Ground Effect

Roberts

Finnis

Knowles

2017

Journal of Fluids Engineering

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The transition from a laminar to turbulent boundary layer on a wing operating at low Reynolds numbers can have a large effect on its aerodynamic performance. For a wing operating in ground effect, where very low pressures and large pressure gradients are common, the effect is even greater. A study was conducted into the effect of forcing boundary-layer transition on the suction surface of an inverted GA(W)-1 section single-element wing in ground effect, which is representative of a racing-car front wing. Transition to a turbulent boundary layer was forced at varying chordwise locations and compared to the free-transition case using experimental and computational methods. Forcing transition caused the laminar-separation bubble, which was the unforced transition mechanism, to be eliminated in all cases and trailing-edge separation to occur instead. The aerodynamic forces produced by the wing with trailing-edge separation were shown to be dependent on trip location. As the trip was moved upstream the separation point also moved upstream, this led to an increase in drag and reduction in downforce. In addition to significant changes to the pressure field around the wing, turbulent energy in the wake was considerably reduced by forcing transition. The differences between free- and forced-transition wings were shown to be significant, highlighting the importance of modeling transition for ground-effect wings. Additionally, it has been shown that while it is possible to reproduce the force coefficient of a higher Reynolds-number case by forcing the boundary layer to a turbulent state, the flow features, both on-surface and off-surface, are not recreated.

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Section: Three-dimensional Rans Simulationssupporting

confidence: 75%

Section: Meses (2d) Computational Resultsmentioning

confidence: 99%

Forcing Boundary-Layer Transition on a Single-Element Wing in Ground Effect

Roberts

Finnis

Knowles

2017

Journal of Fluids Engineering

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“…The wake generators feature a short bluff body with rear upswept diffuser, a rear wing and wheels [12,18,19,20,21,22,23,24,25]. The key features in the wake are recreated to an acceptable level of accuracy, namely the counter-rotating vortex pair and velocity deficit.…”

Section: Introductionmentioning

confidence: 99%

“…The effect of wakes from bluff bodies on isolated wings in ground effect has also been investigated [12,20,21,22,23,24]. Downforce generated by the wings decreased for all ride heights and incidences, though the stall incidence increased [12].…”

Section: Introductionmentioning

confidence: 99%

Aerodynamic Analysis of Grand Prix Cars Operating in Wake Flows

Newbon

Sims-Williams

Dominy

2017

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

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“…In this work a wing has been studied in isolation, however, it should be noted that in real-world conditions the car will be subjected to varying yaw angles not just from side slip and crosswind, but also from interactions with other cars [16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Aerodynamic characteristics of a wing-and-flap configuration in ground effect and yaw

Roberts

Correia²,

Finnis

et al. 2015

Proceedings of the Institution of Mechanical Engineers, Part D:

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The influence of yaw on a model representative of a monoposto racing car front wing and nose section operating in close proximity to the ground is discussed. The yawed condition is representative of a car operating in a crosswind or with side-slip whilst cornering. Due to the need for downforce in corners rather than on a straight it is standard practice to test a racing car at varying orientations of yaw, pitch and roll quasi-statically. Wind tunnel testing with a 50% scale model at a chord-based Reynolds number of 1.69 x 10 6 /m was used to investigate forces and surface flow structures. The results were then used to validate simulations with the 3-equation k-kL-ω transitional turbulence model to observe surface pressures and wake structures. It was found that a change of surface pressures caused asymmetric loading of the wing, the strengthening or inhibiting of vortices depending on their rotational sense, and an overall reduction in both the downforce and drag of the wing; all of which were amplified as yaw angle was increased or ground clearance reduced. The fundamental aerodynamic flow features of a racing car front wing operating at yaw are established.

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Aerodynamic characteristics of a monoposto racing car front wing operating in high turbulence conditions

Cited by 3 publications

References 13 publications

Forcing Boundary-Layer Transition on a Single-Element Wing in Ground Effect

Forcing Boundary-Layer Transition on a Single-Element Wing in Ground Effect

Aerodynamic Analysis of Grand Prix Cars Operating in Wake Flows

Aerodynamic characteristics of a wing-and-flap configuration in ground effect and yaw

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