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Control of base pressure with micro jets:part-I

Rehman, Shafiqur and Khan, Sher Afghan (2008) Control of base pressure with micro jets:part-I. Aircraft Engineering and Aerospace Technology, 80 (2). pp. 158-164. ISSN 0002-2667

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Abstract

This paper aims to present the results of an experimental investigation carried out to control the base pressure in a suddenly expanded axi-symmetric passage.Four micro-jets of 1mm orifice diameter located at 908 interval along a pitch circle diameter of 1.3 times the nozzle exit diameter in the base region was employed as active controls. The test Mach numbers were 1.25, 1.3, 1.48, 1.6, 1.8, 2.0, 2.5 and 3.0. The jets were expanded suddenly into an axi-symmetric tube with cross-sectional area 4.84 times that of nozzle exit area. The length-to-diameter ratio of the sudden expansion tube was varied from 10 to 1. Nozzles generating the above jet Mach numbers were operated with nozzle pressure ratio in the range 3-11. As high as 40 per cent increase in base pressure was achieved. In addition to base pressure, the wall pressure in the duct was also measured. Findings – It is found that the wall pressure is not adversely influenced by the micro jets. Originality/value – The paper provides information on internal supersonic flow.

Item Type: Article (Journal)
Additional Information: 7395/46702
Uncontrolled Keywords: Pressure, Jets
Subjects: T Technology > TL Motor vehicles. Aeronautics. Astronautics
T Technology > TL Motor vehicles. Aeronautics. Astronautics > TL780 Rockets
Kulliyyahs/Centres/Divisions/Institutes: Kulliyyah of Engineering > Department of Mechanical Engineering
Depositing User: Prof. Dr. Sher Afghan Khan
Date Deposited: 19 Feb 2016 08:51
Last Modified: 19 Feb 2016 08:53
URI: http://irep.iium.edu.my/id/eprint/46702

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