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Direct numerical simulation of turbulent trailing edge flow with base flow control

Direct numerical simulation of turbulent trailing edge flow with base flow control
Direct numerical simulation of turbulent trailing edge flow with base flow control
Direct numerical simulationhas been carried out for turbulent flow over a rectangular trailing edge at a Reynolds number of 1x10(3) (based on the free stream quantities and the trailing-edge thickness) and ratio of boundary layer displacement thickness to trailing-edge thickness close to unity. Two types of flow control were studied: base transpiration and secondary splitter plate. Simulation of base transpiration was performed using different slit heights and volume flow rates. It was found that even small flow rates could produce significant changes in overall aerodynamic performance, measured, for example, by the base pressure coefficient. It was also found that for the same volume flow rate, a greater increase in base pressure (drag reduction) was obtained by blowing slowly through a wide slit rather than quickly through a narrow slit. The effectiveness of a secondary splitter plate located on the trailing-edge centerline was investigated by varying the plate length from one to five times the trailing-edge thickness. A significant increase in the base pressure coefficient (about 25%) was achieved, even with the shortest splitter plate equal to the trailing-edge thickness. The base pressure coefficient increased monotonically with the splitter plate length, and no intermediate maximum value was found.
0001-1452
1708-1716
Yao, Y.F.
7eb914a9-e60a-4c47-8b71-b51d379a3a22
Sandham, N.D.
0024d8cd-c788-4811-a470-57934fbdcf97
Yao, Y.F.
7eb914a9-e60a-4c47-8b71-b51d379a3a22
Sandham, N.D.
0024d8cd-c788-4811-a470-57934fbdcf97

Yao, Y.F. and Sandham, N.D. (2002) Direct numerical simulation of turbulent trailing edge flow with base flow control. AIAA Journal, 40 (9), 1708-1716.

Record type: Article

Abstract

Direct numerical simulationhas been carried out for turbulent flow over a rectangular trailing edge at a Reynolds number of 1x10(3) (based on the free stream quantities and the trailing-edge thickness) and ratio of boundary layer displacement thickness to trailing-edge thickness close to unity. Two types of flow control were studied: base transpiration and secondary splitter plate. Simulation of base transpiration was performed using different slit heights and volume flow rates. It was found that even small flow rates could produce significant changes in overall aerodynamic performance, measured, for example, by the base pressure coefficient. It was also found that for the same volume flow rate, a greater increase in base pressure (drag reduction) was obtained by blowing slowly through a wide slit rather than quickly through a narrow slit. The effectiveness of a secondary splitter plate located on the trailing-edge centerline was investigated by varying the plate length from one to five times the trailing-edge thickness. A significant increase in the base pressure coefficient (about 25%) was achieved, even with the shortest splitter plate equal to the trailing-edge thickness. The base pressure coefficient increased monotonically with the splitter plate length, and no intermediate maximum value was found.

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Published date: 2002

Identifiers

Local EPrints ID: 21761
URI: http://eprints.soton.ac.uk/id/eprint/21761
ISSN: 0001-1452
PURE UUID: 21c96fc9-1128-441f-ad36-ca4582e2c146
ORCID for N.D. Sandham: ORCID iD orcid.org/0000-0002-5107-0944

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Date deposited: 15 Mar 2006
Last modified: 17 Dec 2019 01:54

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