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Control of suddenly expanded flow from correctly expanded nozzles

Khan, Sher Afghan and Rathakrishnan, E. (2004) Control of suddenly expanded flow from correctly expanded nozzles. International Journal of Turbo & Jet-Engines, 21 (4). pp. 255-278. ISSN 0334-0082

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Abstract

The effectiveness of micro jets to control base pressure in suddenly expanded axi-symmetric ducts has been presented in this paper. Four micro jets of 1 mm orifice diameter located at 90° intervals along a pitch circle diameter of 1.3 times the nozzle exit diameter in the base region were employed as active controls. The Mach numbers of the suddenly expanded flows were 1.25, 1.30, 1.48, 1.6, 1.8 and 2.0. The jets were expanded suddenly into an axi-symmetric tube with cross-sectional area 2.56, 3.24, 4.84, and 6.25 times that of nozzle exit area. The length-to-diameter ratio of the sudden expansion tube was varied from 10 to 1. The jets at all Mach numbers were correctly expanded. It is found that the micro jets can serve as active controllers for base pressure. Also, the wall pressure distribution is not adversely influenced by the micro jets.

Item Type: Article (Journal)
Additional Information: 5174/46700
Uncontrolled Keywords: Boundary layers; Jets; Nusselt number; Pressure distribution; Pressure effects; Reynolds number; Turbulence
Subjects: T Technology > TL Motor vehicles. Aeronautics. Astronautics > TL500 Aeronautics
Kulliyyahs/Centres/Divisions/Institutes: Kulliyyah of Engineering > Department of Mechanical Engineering
Depositing User: Prof. Dr. Sher Afghan Khan
Date Deposited: 18 Feb 2016 14:53
Last Modified: 15 Jul 2016 07:51
URI: http://irep.iium.edu.my/id/eprint/46700

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