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

[img] PDF
2848.pdf
Restricted to Registered users only

Download (923kB)

Abstract

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

Actions (login required)

View Item View Item