Control of suddenly expanded flow with cavity at sonic Mach number

Fiqri, Muhammad Ikhwan and Ahmed Pathan, Khizer and Khan, Sher Afghan (2024) Control of suddenly expanded flow with cavity at sonic Mach number. In: Advances in Heat Transfer and Fluid Dynamics. Select Proceedings of AHTFD 2022 . Springer, pp. 1-425. ISBN 978-981-99-7212-8

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Abstract

Airflow from a convergent nozzle at sonic Mach number expanded suddenly into a circular duct of larger cross-sectional area, provided with annular rectangular cavities, which was studied numerically, focusing attention on the base pressure, and the flow development in the enlarged duct. It was found that the base pressure is strongly influenced by the expansion level at the nozzle exit, the area ratio of the passage, and the length-to-diameter ratio of the enlarged duct. For the low area ratio, the annular cavities increase the base pressure. Also, the cavity aspect ratio influences the base pressure significantly for the lower area ratio. The nozzle pressure ratio (NPR), the cavity aspect ratio (ASR), and the cavity location (CL) were considered as the flow and geometrical parameters in this study. The computational fluid dynamics approach uses flow from a convergent nozzle for subsonic and sonic Mach numbers with sudden expansion. For this investigation, the Mach number is 1.00, which is sonic, and the duct-to-nozzle exit area ratio is 2.25. The length-to-diameter ratio (L/D) was altered as 1, 2, 3, 4, and 6, while the simulated nozzle pressure ratio (NPR) was 1.5, 2, 3, 4, and 5. The annular rectangular cavities with a width of 3 mm and height of 3 mm for ASR 1. A width of 3 mm and a height of 6 mm for ASR 2 are considered to compare the base pressure results. The nozzle was modeled and analyzed using this work's K-standard wall function turbulence model. The results show that the NPR and cavity placement from the base wall significantly impacted the base pressure.

Item Type:	Book Chapter
Additional Information:	7395/111346
Uncontrolled Keywords:	Control of suddenly expanded flow, cavity, sonic Mach number
Subjects:	T Technology > TL Motor vehicles. Aeronautics. Astronautics > TL787 Astronautics
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:	16 Mar 2024 11:39
Last Modified:	16 Mar 2024 11:39
URI:	http://irep.iium.edu.my/id/eprint/111346

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