Effect of riblets on axisymmetric base pressure

Krishnan, V and Viswanath, PR and Rudrakumar, S (1997) Effect of riblets on axisymmetric base pressure. Journal of Spacecraft and Rockets, 34 (2). pp. 256-258. ISSN 0022-4650

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Experiments have been performed assessing riblet effects on axisymemtric base pressure at low speeds. The tests were conducted in the 0.91-m-diam. low-speed wind tunnel at a freestream velocity of 20 m/s. It is shown that, with a large-scale or massive separation, riblets do not decrease the base drag at low speeds; on the other hand, there is a progressive increase in base drag with h+ and the drag penalty is about 8 percent for the optimized drag reducing riblet. Riblets may provide a small pressure or base drag reduction on streamlined bodies with a sharp trailing edge like an airfoil or turbine blade, because the effects of viscous-induced displacement thickness will be lower on the riblet surface.

Item Type: Article
Additional Information: Copyright for this article belongs to AIAA
Uncontrolled Keywords: Base pressure;Riblets;Drag reduction;Reynolds number;Skin friction
Subjects: AERONAUTICS > Aerodynamics
Depositing User: M/S ICAST NAL
Date Deposited: 08 Mar 2010
Last Modified: 24 May 2010 04:21
URI: http://nal-ir.nal.res.in/id/eprint/2848

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