The new boundary layer control system for NRC's 9 m x 9 m wind tunnel

Larose, Guy L.; Tanguay, Bernard; Va, David; Bender, Trevor

doi:10.2514/6.2001-455

Cited by 13 publications

(4 citation statements)

References 5 publications

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“…However, with some improvement of the apparatus it is reasonable to assume comparable performance to suction systems, such as in the NRC 5 , where reductions in δ 1 on the order of 71% have been observed. With the information gained from this study it appears this technique is a well-suited candidate for more development.…”

Section: Discussionmentioning

confidence: 99%

“…These systems come in a variety of implementations [5][6] but they all have the same general principle: remove the boundary layer by sucking it through the floor and reintroduce the same volume flow downstream. Some systems apply suction at the test section entrance, resulting in a fresh new boundary layer developing behind the suction location.…”

Section: Suction Systemsmentioning

confidence: 99%

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Development of a New Boundary Layer Control Technique for Automotive Wind Tunnel Testing

Farrell

2006

44th AIAA Aerospace Sciences Meeting and Exhibit

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Section: Discussionmentioning

confidence: 99%

Section: Suction Systemsmentioning

confidence: 99%

Development of a New Boundary Layer Control Technique for Automotive Wind Tunnel Testing

Farrell

2006

44th AIAA Aerospace Sciences Meeting and Exhibit

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“…Turbulence Simulation-A Road Turbulence System (RTS) [4], shown to be appropriate for the study of the aerodynamics of LDVs [5], was used for the experiments. In earlier phases of this study, it was concluded that flow turbulence generated by the RTS can have an impact on the performance of drag reduction technologies for LDVs [2,1].…”

Section: Ground Effect Simulation-the Test Section Is Equipped With Amentioning

confidence: 99%

Investigation of Drag Reduction Technologies for Light-Duty Vehicles Using Surface, Wake and Underbody Pressure Measurements to Complement Aerodynamic Drag Measurements

Souza¹,

Raeesi²,

Belzile³

et al. 2019

SAE Int. J. Adv. & Curr. Prac. in Mobility

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Amulti-year, multi-vehicle study was conducted to quantify the aerodynamic drag changes associated with drag reduction technologies for light-duty vehicles. Various technologies were evaluated through fullscale testing in a large low-blockage closed-circuit wind tunnel equipped with a rolling road, wheel rollers, boundary-layer suction and a system to generate roadrepresentative turbulent winds. The technologies investigated include active grille shutters, production and custom underbody treatments, air dams, wheel curtains, ride height control, side mirror removal and combinations of these. This paper focuses on mean surface-, wake-, and underbody-pressure measurements and their relation to aerodynamic drag. Surface pressures were measured at strategic locations on four sedans and two crossover SUVs. Wake total pressures were mapped using a rake of Pitot probes in two cross-flow planes at up to 0.4 vehicle lengths downstream of the same six vehicles in addition to a minivan and a pickup truck. A smaller rake was used to map underbody total pressures in one cross-flow plane downstream of the rear axle for three of these vehicles. The results link drag reduction due to various technologies with specific changes in vehicle surface, rear underbody and wake pressures, and provide a database for numerical studies. In particular, the results suggest that existing or idealized prototype technologies such as active grille shutters, sealing the external grille and ride height control reduce drag by redirecting incoming flow from the engine bay or underbody region to smoother surfaces above and around the vehicle. This mechanism can enhance the reduction in wheel drag due to reduced wheel exposure at lowered ride height. Sealing the external grille was found to redirect the flow more efficiently than closing the grille shutters, and resulted in greater drag reduction. Underbody treatments were also

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“…3). One common equation for a turbulent boundary layer with a zero pressure gradient, δ, is defined as (21) :…”

Section: Boundary Layermentioning

confidence: 99%

Design methodology and performance of an indraft wind tunnel

2004

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The new boundary layer control system for NRC's 9 m x 9 m wind tunnel

Cited by 13 publications

References 5 publications

Development of a New Boundary Layer Control Technique for Automotive Wind Tunnel Testing

Development of a New Boundary Layer Control Technique for Automotive Wind Tunnel Testing

Investigation of Drag Reduction Technologies for Light-Duty Vehicles Using Surface, Wake and Underbody Pressure Measurements to Complement Aerodynamic Drag Measurements

Design methodology and performance of an indraft wind tunnel

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