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Passive control of base pressure in a converging-diverging nozzle with area ratio 2.56 at mach 1.8

Husnina, Nur and Khan, Sher Afghan and Aabid, Abdul and Baig, Muneer and Shaiq, Istiyaq Mudassir (2022) Passive control of base pressure in a converging-diverging nozzle with area ratio 2.56 at mach 1.8. Fluid Dynamics and Manufacturing Process, 19 (3). pp. 569-577. ISSN 1555-256X E-ISSN 1555-2578

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Abstract

In this study, a duct is considered and special attention is paid to a passive method for the control of the base pressure relying on the use of a cavity with a variable aspect ratio. The Mach number considered is 1.8, and the area ratio of the duct is 2.56. In particular, two cavities are examined, their sizes being 3:3 and 6:3. The used L/D spans the interval 1–10 while the NPRs (nozzle pressure ratio) range from 2 to 9. The results show that the control becomes effective once the nozzles are correctly expanded or under-expanded. The pressure contours at different NPR and L/D are presented. It is shown that the NPR and cavity location strongly influence the base pressure. The NPR, Mach number, and cavity aspect ratio have a strong effect on the base pressure in the wake region.

Item Type: Article (Journal)
Uncontrolled Keywords: Base pressure; passive control; computational fluid dynamics (CFD); supersonic; aerodynamics; cavity
Subjects: T Technology > TL Motor vehicles. Aeronautics. Astronautics
T Technology > TL Motor vehicles. Aeronautics. Astronautics > TL780 Rockets
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: 30 Sep 2022 08:06
Last Modified: 30 Sep 2022 08:10
URI: http://irep.iium.edu.my/id/eprint/100351

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