Passive control of sonic flow from converging nozzle with D-shaped rib

Makwana, Mayur Bharatbhai and Bellary, Sayed Ahmed Imran and Khan, Sher Afghan and Aabid, Abdul and Baig, Muneer (2025) Passive control of sonic flow from converging nozzle with D-shaped rib. Results in Engineering, 26. pp. 1-27. ISSN 2590-1230

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Abstract

The abrupt expansion at the blunt base of projectiles, rockets, missiles, and other similar objects is a common phenomenon. The abrupt increase in the base area and the pressure in the separated region cause flow separation and reattachment The recirculation area is at a lower pressure than the surrounding atmospheric pressure. The separation at the blunt base will result in low pressure, resulting in a considerable amount of base drag. In this work, the base pressure, which is lower than the ambient pressure, leading to base drag, is controlled by a passive control method, such as a d-shaped rib. The duct diameter is 25 mm, and its length-to-diameter (L/D) ratio is 6. Ribs of heights ranging from 1 mm to 3 mm were utilized to control the base pressure when located at L/D = 0.5, 1.0, 1.5, 2, and 3. When the rib was located at L/D = 1, the base pressure values for a 3 mm rib height increased considerably. Ribs with smaller heights are more vulnerable to changes in rib placements, as the reattachment point lies between L/D = 2 and 3D. This results in slight variations in the base pressure ratios at other locations. According to the study, 2 mm ribs are the optimum option if the mission requires equating the base pressure to ambient atmospheric pressure. If the mission requires a fifty percent enhancement in base pressure, then even a 1 mm rib is sufficient. The 3 mm rib is the optimal option if the mission requirements require significantly increasing the base pressure.

Item Type:	Article (Journal)
Uncontrolled Keywords:	Circular ribs, CFD, Flow control, Mach number, Duct
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 Kulliyyah of Engineering
Depositing User:	Prof. Dr. Sher Afghan Khan
Date Deposited:	08 May 2025 11:04
Last Modified:	08 May 2025 11:04
URI:	http://irep.iium.edu.my/id/eprint/120852

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