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Effect of area ratio on base pressure and control effectiveness

G. M., Fharukh Ahmed and Khan, Sher Afghan (2019) Effect of area ratio on base pressure and control effectiveness. International Journal of Recent Technology and Engineering, 8 (2S3). pp. 953-958. E-ISSN 2277-3878

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Reducing the base drag and increasing the base pressure from aerodynamic devices involving suddenly expanded flows is of vital importance due to the higher rate of drag associated with them. The experimental effort put into understanding the variation in base pressure using active control of suddenly expanded flows employing microjets is reported in this article. The effect of tiny jets and nozzle pressure ratio (NPR), and length to diameter (L/D) ratio on the percentage change in base pressure is investigated at supersonic Mach numbers at 1.7, 2.3, and 2.7, for area ratios of 2.56, 5.06, and 7.56. Apart from NPR, the L/D ratio has an influential role in percentage change in base pressure at different Mach numbers. An improvement of up to 360 % in base pressure is obtained with the use of sonic microjets at a particular Mach number and L/D ratio.

Item Type: Article (Journal)
Additional Information: 7395/73975
Uncontrolled Keywords: Active control, microjets, Mach number, expanded flows, area ratio
Subjects: T Technology > TL Motor vehicles. Aeronautics. Astronautics > TL787 Astronautics
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button): Kulliyyah of Engineering
Kulliyyah of Engineering > Department of Mechanical Engineering
Depositing User: Prof. Dr. Sher Afghan Khan
Date Deposited: 06 Sep 2019 10:03
Last Modified: 24 Aug 2020 16:22
URI: http://irep.iium.edu.my/id/eprint/73975

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