Numerical analysis of cavity-based control of base pressure variations at supersonic Mach numbers

Ridwan, R and Khan, Sher Afghan and Syed Mohamed Ali, Jaffar and Sapardi, Mohd Azan Mohammed and Aabid, Abdul (2023) Numerical analysis of cavity-based control of base pressure variations at supersonic Mach numbers. Fluid Dynamics & Materials Processing, 23 (3). pp. 1-23. ISSN 1555-256X E-ISSN 1555-2578

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Abstract

In the present study, the base pressure variations induced by the presence of a cavity, known to strongly influence the behavior of supersonic projectiles, are investigated through the numerical solution of the balance equations for mass, momentum, and energy. An area ratio of four is considered and numerical simulations are carried out at Mach M = 1.2, 1.4, 1.6, and 1.8 assuming no cavity or cavity locations 0.5D, 1D, 1.5D, and 2D. The inlet pressure of the nozzle is considered a flow variable. The Taguchi method is also used, and the considered cases are then analyzed using a full factorial experimental design. The results show that the cavity effectively increases the base pressure for the conditions examined. For other nozzle pressure ratios, cavities do not lead to passive control due to the change in the reattachment length. The distribution of wall pressure reveals that, in general, a cavity used to implement passive control of the base pressure does not adversely influence the flow pattern in the domain.

Item Type:	Article (Journal)
Uncontrolled Keywords:	Mach number; cavity; Taguchi; base flow; base drag
Subjects:	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 > Department of Mechanical Engineering
Depositing User:	Prof. Dr. Sher Afghan Khan
Date Deposited:	22 Nov 2022 10:14
Last Modified:	31 Dec 2023 15:40
URI:	http://irep.iium.edu.my/id/eprint/101306

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