An Experimental Investigation into the Flow Mechanisms Around an SUV in Open and Closed Cooling Air Conditions

Pitman, John; Gaylard, Adrian

doi:10.1007/978-3-319-67822-1_4

Cited by 5 publications

(1 citation statement)

References 9 publications

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“…The pressure on the base of a vehicle accounts for a major proportion of the overall drag. This proportion can exceed 30% for a sedan [11] and was roughly approximated to 40% for the CUV shown in Figure 5 by averaging the measurements from the rear-facing pressure taps and assuming that this average pressure acts on an area equivalent to the frontal area. Consequently, the average base pressure was considered to be a simple and useful metric to compare with drag measurements.…”

Section: Relating Base Pressure and Drag Measurementsmentioning

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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Section: Relating Base Pressure and Drag Measurementsmentioning

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

View full text Add to dashboard Cite

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Improvement of the aerodynamic behavior of a sport utility vehicle numerically by using some modifications and aerodynamic devices

Al-Saadi

Al-Farhany

Al-Chlaihawi

et al. 2022

Sci Rep

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The present study proposes aerodynamically optimized exterior designs of a sport utility vehicle using computational fluid dynamics analysis based on steady-state Reynolds-averaged Navier–Stokes turbulence models. To achieve an optimal design, modifications of the outer shape and adding some aerodynamic devices are investigated. This study focuses on modifying this vehicle model’s upper and front parts. At the same time, the rear diffuser and spare tire on the back door as a fairing are used as aerodynamic devices for improving streamlines. All these modifications and add-on devices are simulated individually or in combination to achieve the best exterior design. A variety of Reynolds numbers are used for determining the optimization variables. Tetrahedral cells are used throughout the global domain because of the sharp edges in the geometry of the Discovery car model. At the same time, prism cells around car surfaces are adopted to improve the accuracy of the results. A good agreement between the numerical drag coefficient in the present study for the baseline models and the experimental data has been achieved. Changes in the drag and lift coefficients are calculated for all models. It is clear from the numerical results that the use of combined modifications and add-on devices has a significant effect in improving the overall aerodynamic behavior. As a result, the drag coefficient for the optimal design of the Discovery 4th generation is reduced from 0.4 to 0.352 by about 12% compared to the benchmark. Simultaneously, the lift coefficient is 0.037 for optimal design, and it is an acceptable value. It is found that combining all optimal modified configurations can improve both CD and CL simultaneously.

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Introduction of the AeroSUV-A New Generic SUV Model for Aerodynamic Research

Zhang

Tanneberger

Kuthada

et al. 2019

SAE Technical Paper Series

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An Experimental Investigation into the Flow Mechanisms Around an SUV in Open and Closed Cooling Air Conditions

Cited by 5 publications

References 9 publications

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

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

Improvement of the aerodynamic behavior of a sport utility vehicle numerically by using some modifications and aerodynamic devices

Introduction of the AeroSUV-A New Generic SUV Model for Aerodynamic Research

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