The force and pressure of a diffuser-equipped bluff body in ground effect
The force and pressure of a diffuser-equipped bluff body in ground effect
The force and pressure behavior of a generic diffuser in ground effect were investigated. The diffuser model is a bluff body with a rear diffuser at 17 deg to the horizontal, and side-plates. Measurements were conducted in a low speed wind tunnel equipped with a moving ground facility. Techniques employed were force balance, pressure taps, and surface flow visualization. The diffuser flow in ground effect was characterized by vortex flow and three-dimensional flow separation. Four types of force behavior were observed: (a) down-force enhancement at high ride heights characterized by an attached symmetric diffuser flow, (b) maximum down-force at moderate ride heights characterized by a symmetric diffuser flow and separation on the diffuser ramp surface, (c) down-force reduction at low ride heights characterized by an asymmetric diffuser flow and flow separation, and (d) low down-force at very low ride heights, also characterized by an asymmetric diffuser flow and flow separation. The down-force reduction near the ground is attributed to flow separation at the diffuser inlet and subsequent loss of suction in the first half of the diffuser.
105-111
Senior, Andrea E.
2d6c1246-485e-41b7-87d2-3156a02b1b91
Zhang, Xin
3056a795-80f7-4bbd-9c75-ecbc93085421
2001
Senior, Andrea E.
2d6c1246-485e-41b7-87d2-3156a02b1b91
Zhang, Xin
3056a795-80f7-4bbd-9c75-ecbc93085421
Senior, Andrea E. and Zhang, Xin
(2001)
The force and pressure of a diffuser-equipped bluff body in ground effect.
Journal of Fluids Engineering: Transactions of the ASME, 123 (1), .
(doi:10.1115/1.1340637).
Abstract
The force and pressure behavior of a generic diffuser in ground effect were investigated. The diffuser model is a bluff body with a rear diffuser at 17 deg to the horizontal, and side-plates. Measurements were conducted in a low speed wind tunnel equipped with a moving ground facility. Techniques employed were force balance, pressure taps, and surface flow visualization. The diffuser flow in ground effect was characterized by vortex flow and three-dimensional flow separation. Four types of force behavior were observed: (a) down-force enhancement at high ride heights characterized by an attached symmetric diffuser flow, (b) maximum down-force at moderate ride heights characterized by a symmetric diffuser flow and separation on the diffuser ramp surface, (c) down-force reduction at low ride heights characterized by an asymmetric diffuser flow and flow separation, and (d) low down-force at very low ride heights, also characterized by an asymmetric diffuser flow and flow separation. The down-force reduction near the ground is attributed to flow separation at the diffuser inlet and subsequent loss of suction in the first half of the diffuser.
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Published date: 2001
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Local EPrints ID: 21757
URI: http://eprints.soton.ac.uk/id/eprint/21757
PURE UUID: 7ce033b2-a79e-4c61-86b6-9963d8e87871
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Date deposited: 15 Mar 2006
Last modified: 15 Mar 2024 06:32
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Author:
Andrea E. Senior
Author:
Xin Zhang
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