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Effect of expansion level and relief to shear layer in a suddenly expanded flow: a CFD approach

Ridwan, Ridwan and Rosnin, Muhammed Ammar Rusydi and Aabid, Abdul and Khan, Sher Afghan and Mohamed Ali, Jaffar Syed and Mohammed Sapardi, Mohd Azan (2022) Effect of expansion level and relief to shear layer in a suddenly expanded flow: a CFD approach. Journal of Advanced Research in Fluid Mechanics and Thermal Sciences, 100 (3). pp. 202-229. E-ISSN 2289-7879

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Computational Fluid Dynamics analysis was used to study the effect of expansion level in a suddenly expanded flow for a converging-diverging nozzle expanded to the duct of larger diameter at supersonic Mach number. Parameters include the nozzle pressure ratio (NPR), L/D ratio, and area ratio. The model of the converging-diverging (C-D) nozzle suddenly expanding into the enlarged duct with the cavity was created using the Design Modeler of ANSYS Fluent. The Mach number of the study is 1.6. The area ratio varied from 2.25 to 5.29, and the L/D ranged from 1 to 10. The simulated nozzle pressure ratio (NPR) ranged from 2, 3, 4.25, and 6.375. The outcome demonstrated that the geometric alteration and NPR strongly affect the base pressure. The ambient pressure influences result in lower L/Ds. The cavity of aspect ratio 1 is most effective in raising the base pressure. Increasing the width does not yield any desirable results. However, the location of the cavity played a very significant role in base pressure regulation. The duct's wall pressure and the flow field remained identical with and without control.

Item Type: Article (Journal)
Uncontrolled Keywords: Flow control; supersonic flow; NPR; base pressure; CD nozzle
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: 11 Jan 2023 15:06
Last Modified: 11 Jan 2023 15:06
URI: http://irep.iium.edu.my/id/eprint/103130

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