Active control of base pressure in supersonic regime

Khan, Sher Afghan and Rathakrishnan, E. (2006) Active control of base pressure in supersonic regime. Journal of Aerospace Engineering, Institution of Engineers, India, 87 (5). pp. 1-8. ISSN 0257-3423

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Abstract

This paper presents an experimental investigation to study the effectiveness of micro jets to control base pressure in suddenly expanded axi-symmetric ducts. Four micro jets of 1-mm orifice dia located at 90° intervals along a pitch circle dia of 1.3 times the nozzle exit dia in the base region are employed as active controls. The Mach numbers at the entry to the suddenly expanded duct studied in the present study are 1.25, 1.30, 1.48, 1.60, 1.80, 2.00, 2.50 and 3.00. The jets are expanded suddenly into an axisymmetric tube with cross-sectional area 3.24 times that of nozzle exit area. The L/D ratio of the sudden expansion tube is varied from 10 to 1. As high as 40% increase in base pressure is achieved. It is found that the micro jets can serve as active controllers for base pressure. Also, the micro jets do not adversely influence the wall pressure distribution.

Item Type:	Article (Journal)
Additional Information:	7395/46703
Uncontrolled Keywords:	Base pressure; Nozzle pressure ratio; Micro jets; Wall pressure
Subjects:	T Technology > TL Motor vehicles. Aeronautics. Astronautics > TL500 Aeronautics
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Engineering > Department of Mechanical Engineering
Depositing User:	Prof. Dr. Sher Afghan Khan
Date Deposited:	04 Apr 2016 16:45
Last Modified:	04 Apr 2016 16:45
URI:	http://irep.iium.edu.my/id/eprint/46703

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