DOE's Effort to Reduce Truck Aerodynamic Drag Through Joint Experiments and Computations

McCallen, Rose; Salari, Kambiz; Ortega, Jason; Castellucci, Paul; Paschkewitz, John S.; Eastwood, C. W.; Dechant, Lawrence; Hassan, Basil; Pointer, W. David; Browand, F. K.; Radovich, Charles; Merzel, Tai; Plocher, Dennis; Leonard, Anthony; Rubel, M; Ross, James C.; Heineck, James T.; Walker, Stephen; Storms, Bruce; Roy, Christopher J.; Whitfield, David L.; Pankajakshan, Ramesh; Taylor, Lafayette K.; Sreenivas, Kidambi; Englar, Robert J.

doi:10.4271/2005-01-3511

Cited by 20 publications

(12 citation statements)

References 7 publications

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“…13. In terms of the differences between absolute values of the longitudinal force coefficients C x between the CFD and physical simulation, the results are consistent with those obtained by McCallen et al (2005) for a heavy highway truck-and-trailer. There, the differences between the frontal air drag values between the CFD and wind-tunnel modeling of up to 0.22 were reported for zero yaw angle.…”

Section: Wind Tunnel Testingsupporting

confidence: 89%

On the optimal model configuration for aerodynamic modeling of open cargo railway train

Golovanevskiy

Chmovzh

Girka

2012

Journal of Wind Engineering and Industrial Aerodynamics

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Section: Wind Tunnel Testingsupporting

confidence: 89%

On the optimal model configuration for aerodynamic modeling of open cargo railway train

Golovanevskiy

Chmovzh

Girka

2012

Journal of Wind Engineering and Industrial Aerodynamics

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“…The presence of the flaps in the work of Grandemange act to remove the separated flow from the near wall region and leave a region of quiescent air next to the base. This is well known [3,4,5,10] to create an increase in the local base pressure, and is often presented as a passive method for drag reduction on commercial vehicles. In the work of Grandemange, changing the flap angles will then act to change the wake size and energy as well as the balance between the upper and lower vortex structures and the interaction between these.…”

Section: Top and Bottom Edge Tapermentioning

confidence: 99%

“…This can be achieved through passive optimization, for example geometry changes, vortex generators, flaps, and surface roughness, or using active control, for example, suction, blowing, oscillated suction and blowing, moveable vortex generators or flaps [2][3][4][5][6][7][8][9][10][11]. Active flow control is an attractive option because of the potential freedom it allows for vehicle styling as all that is required externally is the jet orifices.…”

Section: Introductionmentioning

confidence: 99%

Influence of Short Rear End tapers on the Base Pressure of a Simplified Vehicle.

Perry

Passmore

Finney

2015

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

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Author, co-author (Do NOT enter this information. It will be pulled from participant tab in MyTechZone)Affiliation (Do NOT enter this information. It will be pulled from participant tab in MyTechZone) AbstractThis paper looks into the effect on base pressure of applying a high aspect ratio chamfer to all edges of a simplified squareback model (the Windsor model). The effects are investigated using force and moment measurements along with surface pressure measurements on the slanted surface and vertical base. The work forms part of a larger study to develop understanding of the mechanisms that influence overall base pressure and hence the resulting aerodynamic drag.A short slant (approx. 4% of model length) was applied to the trailing edges of the simplified vehicle model, representing the small rear end optimisation typical of many real vehicle geometries. Two experiments were performed: the first applied a chamfer at varying angles to the top and bottom edges; the second test looked at the same chamfer angle applied to the sides of the model geometry while the top and bottom angle remained square. The changes in drag are discussed and explained in the context of the base pressures and area weighted pressure coefficients.

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“…Passive flow control techniques that have been applied recently are demonstrated in work by Littlewood [4] and others [5][6][7][8][9][10][11] where the work has proved the vast scope for base pressure increase that has yet to be fully exploited. However most of this work has been conducted with models with smooth floor, yet it has been found that pressure recovery found on the simplified model geometry does not cross over to full scale testing, as shown by Littlewood [12].…”

Section: Introductionmentioning

confidence: 99%

The Impact of Underbody Roughness on Rear Wake Structure of a Squareback Vehicle

Perry¹,

Passmore²

2013

SAE Technical Paper Series

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In this paper the effects of a rough floor on the rear wake structure of a simplified squareback model (the Windsor model) is investigated using balance, base pressure measurements and two and three component planar PIV. The work forms part of a larger study to develop understanding of the mechanisms that influence overall base pressure and hence the aerodynamic drag. In the work reported in this paper the impact of a rough floor on the base pressure and wake flow structures is quantified at three different ride heights. The floor roughness has been created through the addition of five roughness strips and the ride heights of 10.3%, 17.3% and 24.2% of the model height are assessed. All work has been carried out in the Loughborough University Large Wind Tunnel with a ¼ scale model giving a blockage ratio of 4% for a smooth under-body or 4.5% with the roughness strips. The tests are conducted with a fixed ground plane.Results are presented for the base pressure distribution and the area weighted contribution to the drag. These are correlated against the streamwise results. This work demonstrates the need for rough floor structures to be considered before model scale work is conducted.

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DOE's Effort to Reduce Truck Aerodynamic Drag Through Joint Experiments and Computations

Cited by 20 publications

References 7 publications

On the optimal model configuration for aerodynamic modeling of open cargo railway train

On the optimal model configuration for aerodynamic modeling of open cargo railway train

Influence of Short Rear End tapers on the Base Pressure of a Simplified Vehicle.

The Impact of Underbody Roughness on Rear Wake Structure of a Squareback Vehicle

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