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ARTICLE

Numerical Analysis of Cavity-Based Control of Base Pressure Variations at Supersonic Mach Numbers

Ridwan1, Sher Afghan Khan1,*, Jaffar Syed Mohamed Ali1, Mohd. Azan Mohammed Sapardi1, Abdul Aabid2
1 Mechanical and Aerospace Engineering Department, Faculty of Engineering, International Islamic University, Kuala Lumpur, 53100, Malaysia
2 Department of Engineering Management, College of Engineering, Prince Sultan University, Riyadh, 11586, Saudi Arabia
* Corresponding Author: Sher Afghan Khan. Email: sakhan@iium.edu.my
(This article belongs to this Special Issue: Materials, Energy, and Fluid Dynamics)

Fluid Dynamics & Materials Processing https://doi.org/10.32604/fdmp.2023.025230

Received 30 June 2022; Accepted 27 September 2022; Published online 15 November 2022

Abstract

In the present study, the base pressure variations induced by the presence of a cavity, known to have a strong influence of the behaviour of supersonic projectiles, are investigated through 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 as 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 is effective in increasing the base pressure for the conditions examined. For other nozzle pressure ratios, cavities do not lead to passive control due 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.

Keywords

Mach number; cavity; Taguchi; base flow; base drag
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