The Effect of Base Bleed and Rear Cavities on the Drag of an SUV Jaguar Land Rover

Format:

Conference/Event

Author/Creator:

Irving Brown, Irving Brown, author.

Contributor:

Gaylard, A.P.

Windsor, S.

Conference Name:

SAE 2010 World Congress & Exhibition (2010-04-13 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2010

Summary:

Two methods of passive flow control were investigated todetermine their effectiveness in reducing aerodynamic drag on largeSports Utility Vehicles (SUVs). Passive means of flow control wereselected since all active methods require the input of additionalenergy (e.g., pressurized fluids or electrical energy). Theselected methods were base bleed and the use of a rear cavity, andvarious combinations of these were experimentally tested infull-scale wind tunnels with and without a moving belt/rotatingwheel assembly. Aerodynamic drag reduction was accomplished byrestructuring the low-pressure wake directly behind thevehicle.External cavity depths ranging from d/h=0.17 to 0.83 were used,while body cavity depths ranged from d/h=0 to 0.83, where the depthof the cavity d is non-dimensionalized by the height h of the basearea. External cavities always resulted in an increase in the dragcoefficient, while for body cavities the reduction in drag improvedwith increasing cavity depth. A maximum drag reduction of -3.3% wasachieved.The base bleed coefficient was varied from Cq=(3-21)x 10-⁴, and various bleed outlet locations in the base area wereconsidered. Bleeding air around the periphery of the base area wasfound to be the most effective implementation, and depending on theoutlet location the drag reduction ranged from -0.3% to -1.1%

Notes:

Vendor supplied data

Publisher Number:

2010-01-0512

Access Restriction:

Restricted for use by site license