Computational analysis of thrust generated by converging-diverging nozzle at different diverging angles

Bellary, Sayed Ahmed Imran and Dabir, Shahab Ahmed and Khan, Sher Afghan and Tamhane, Tushar and Shaikh, Javed Habib and Khan, Ambareen (2025) Computational analysis of thrust generated by converging-diverging nozzle at different diverging angles. Journal of Advanced Research in Numerical Heat Transfer, 29 (1). pp. 102-128. ISSN 2735-0142

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Abstract

This study investigated the pressure rise characteristics of a shock train contained within a duct representative of a supersonic combustion ramjet (scramjet) isolator. The simulated isolator consisted of a constant area (25 mm by 30 mm) rectangular duct back-pressured by a triangular-shaped wedge with a vertex angle of 60 degrees. The CFD technique is used to investigate the performance of converging-diverging (CD) nozzles at different divergence angles ranging between 5° to13.5° with constant throat diameter and the isolator. The dimensions of the CD nozzle considered were 25.9 mm and 7.7 mm inlet and throat diameters, respectively, and nozzle pressure ratio (NPR) of 9. The study aims to isolate the shock wave inside the isolator so that fuel injection can be done at a supersonic Mach number. The 3D model is created on Inventor 2022 software, with a converging angle of 20° and a converging length of 25 mm. The results showed that the diverging angle is crucial in determining the back pressure and Mach number. An increase of diverging angle by 0.1° causes flow separation at the lip of the nozzle. Thus, the optimum diverging angle of 13.5° achieves maximum velocity for a given CD nozzle geometry at specific operating conditions.

Item Type:	Article (Journal)
Additional Information:	7395/11921
Uncontrolled Keywords:	Convergent divergent Nozzle; CFD Analysis; Diverging Angle; Mach Number, Thrust
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:	06 Feb 2025 17:26
Last Modified:	06 Feb 2025 17:26
URI:	http://irep.iium.edu.my/id/eprint/119211

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