Studies on suddenly expanded flow at different levels of over expansion for area ratio 3.24

Baig, Maugal Ahmed Ali and Khan, Sher Afghan and Rathakrishnan, E. (2012) Studies on suddenly expanded flow at different levels of over expansion for area ratio 3.24. International Journal of Scientific & Engineering Research, 3 (8). pp. 1-6. ISSN 2229-5518

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Abstract

The experimental investigations carried out to study the variations in base pressure at different levels of over expansion of jet in a suddenly expanded axi-symmetric duct is presented in this paper. The two different fixed levels of Over Expansion selected in the study are 0.277 and 0.56. The area ratio of the present study is 3.24. The jet Mach numbers at the entry to the suddenly expanded duct, studied are 2.2 and 2.58. The length-to-diameter ratio of the suddenly expanded duct is varied from 10 to 1. Active control in the form of four micro jets of 1mm orifice diameter located at 900 intervals along a pitch circle diameter of 1.3 times the nozzle exit diameter in the base region are employed. In addition to base pressure, wall pressure field along the duct is also studied. From the present studies it is found that at a high level of over expansion micro jets are marginally effective. It is also found from wall pressure studies that the micro jets do not disturb the flow field in the enlarged duct.

Item Type:	Article (Journal)
Additional Information:	7395/49923
Uncontrolled Keywords:	Active Control, Over expanded jet, Wall pressure distribution, Base Pressure
Subjects:	T Technology > TL Motor vehicles. Aeronautics. Astronautics T Technology > TL Motor vehicles. Aeronautics. Astronautics > TL787 Astronautics
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Ahmad Ibrahim Kulliyyah of Laws > Department of Islamic Law
Depositing User:	Prof. Dr. Sher Afghan Khan
Date Deposited:	15 Apr 2016 16:54
Last Modified:	15 Apr 2016 16:54
URI:	http://irep.iium.edu.my/id/eprint/49923

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