BASE FLOW CONTROL THROUGH A TRIANGULAR CAVITY WITH SUDDEN EXPANSION AT SUPERSONIC MACH NUMBER FOR LOWER AREA RATIO

Shetty, Shamitha and Khan, Sher Afghan and Khan, Ambareen and Akhtar, Mohammad Nishat and Elmi, Abu Bakar and Pathan, Khizar Ahmed (2026) BASE FLOW CONTROL THROUGH A TRIANGULAR CAVITY WITH SUDDEN EXPANSION AT SUPERSONIC MACH NUMBER FOR LOWER AREA RATIO. JOURNAL OF MECHANICS OF CONTINUA AND MATHEMATICAL SCIENCES, 21 (10). pp. 80-101. ISSN 0973-8975 E-ISSN 2454-7190

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Abstract

This investigation examines passive control tactics for administering base pressure at Mach M = 1.8. Because the base pressure in the separated section is reduced and below the back pressure, it contributes a sizable portion of the total drag. Hence, we must restrain or regulate this parameter. Consequently, we use base drag to extend the range of aerospace vehicles and save energy. We select expansion levels to expose the nozzle to both adverse and favorable pressure conditions, allowing us to evaluate the control mechanism's efficacy. We select three cavity geometries to evaluate the flow-regulation mechanism by placing the cavities at various positions across a range of duct sizes. The simulated results show that the cavity is effective only when the viscous layer exiting the nozzle enters the cavity; otherwise, the control is ineffective, regardless of whether the reattachment point occurs before or after the cavity. The present investigation shows that the cavity is most effective when located 8.5 mm from the base; however, at other cavity locations, its effectiveness is negligible except at NPRs 3 and 5. At these two NPRs, the exiting flow is associated with oblique shock waves and an adverse pressure gradient, which reduces base pressure.

Item Type:	Article (Journal)
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:	05 Nov 2026 14:52
Last Update:	05 Nov 2026 15:18
Queue Number:	2026-10-Q6010
URI:	http://irep.iium.edu.my/id/eprint/132470
Indexed In:	SCOPUS

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