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Influence of diffuser angle on a bluff body in ground effect

Influence of diffuser angle on a bluff body in ground effect
Influence of diffuser angle on a bluff body in ground effect
The forces and pressures on a generic bluff body in ground effect were investigated. The bluff-body model was equipped with interchangeable underbody diffuser ramps and side plates. Five different diffuser angles were tested: 5, 10, 15, 17, and 20 deg to the horizontal. The experiments were undertaken in a low-speed wind tunnel equipped with a moving ground. Load cells, pressure taps, and surface flow visualization were the techniques used to evaluate the flow field. The flow field is characterized by vortex flow and three-dimensional flow separation. A region of hysteresis was found for the 15, 17, and 20 deg diffusers. As the ride height is varied, five different flow types can be identified with three subtypes within the region of hysteresis. The force reduction phenomenon was found to be caused by both vortex breakdown and flow separation.
332-338
Ruhrmann, Andreas
f52e61af-a0e9-47e4-8e80-bbbb944acc55
Zhang, Xin
3056a795-80f7-4bbd-9c75-ecbc93085421
Ruhrmann, Andreas
f52e61af-a0e9-47e4-8e80-bbbb944acc55
Zhang, Xin
3056a795-80f7-4bbd-9c75-ecbc93085421

Ruhrmann, Andreas and Zhang, Xin (2003) Influence of diffuser angle on a bluff body in ground effect. Journal of Fluids Engineering, Transactions of the ASME, 125 (2), 332-338. (doi:10.1115/1.1537252).

Record type: Article

Abstract

The forces and pressures on a generic bluff body in ground effect were investigated. The bluff-body model was equipped with interchangeable underbody diffuser ramps and side plates. Five different diffuser angles were tested: 5, 10, 15, 17, and 20 deg to the horizontal. The experiments were undertaken in a low-speed wind tunnel equipped with a moving ground. Load cells, pressure taps, and surface flow visualization were the techniques used to evaluate the flow field. The flow field is characterized by vortex flow and three-dimensional flow separation. A region of hysteresis was found for the 15, 17, and 20 deg diffusers. As the ride height is varied, five different flow types can be identified with three subtypes within the region of hysteresis. The force reduction phenomenon was found to be caused by both vortex breakdown and flow separation.

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Published date: 2003

Identifiers

Local EPrints ID: 22607
URI: https://eprints.soton.ac.uk/id/eprint/22607
PURE UUID: 2fe4dbe9-1a3c-4700-ac2f-019490ab317a

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Date deposited: 22 Mar 2006
Last modified: 17 Jul 2017 16:21

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