Passive control of suddenly expanded flow and temperature distribution along the duct at the critical Mach number

Tamboli, Shahid and Sayed, Ahmed Imran Bellary and Abdullah, Roslinda and Monis, Renita Sharon and Khan, Sher Afghan and Jatti, Vijaykumar S. and Kate, Ajit Madhukarrao and Ingole, Yogesh Ramesh and Jilani, Shaikh Sarfaraj (2026) Passive control of suddenly expanded flow and temperature distribution along the duct at the critical Mach number. Scientific Reports, 16 (712). pp. 1-46. ISSN 2045-2322

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Abstract

Abrupt relief at the blunt base is common in aerospace because a recirculation zone reduces pressure and increases drag. This study investigates the control of base pressure at Mach 1.0 by using quarter-ribs placed at various points within an axisymmetric duct. CFD simulations with ANSYS Fluent identified the optimal rib size, position, and nozzle pressure ratio (NPR) for either maximizing or minimizing base pressure. Air flows from a converging nozzle into a 16 mm diameter duct, with lengths ranging from L/D = 1 to 6, rib radii from 1 mm to 2.5 mm, and placements from L/D = 0.5 to 2.0. Results demonstrate that ribs significantly impact base pressure by interacting with the shear layer and duct wall. This interaction affects flow reattachment and the pressure differences, which depend on the ribs' size and location. Ribs at 0.5D and 1D slightly increase base pressure, while those at 1.5D and 2D are more effective. Larger rib radii enhance shear layer reattachment, further boosting pressure. Temperature analysis reveals a rise immediately behind the rib, attributed to the increased flow area, followed by a subsequent drop. These findings enable the optimization of passive control strategies in high-speed aerodynamics, thereby improving system reliability, reducing costs, increasing fuel efficiency, and supporting environmental goals.

Item Type:	Article (Editorial)
Additional Information:	7395/126840
Uncontrolled Keywords:	Base pressure ratio, Passive control, Ribs, Expansion level, Computational fluid dynamics, L/D ratio
Subjects:	T Technology > TL Motor vehicles. Aeronautics. Astronautics > TL500 Aeronautics
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:	12 Jan 2026 17:26
Last Modified:	12 Jan 2026 17:26
Queue Number:	2026-01-Q1642
URI:	http://irep.iium.edu.my/id/eprint/126840

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