Experiments on wall pressure at an area ratio 4.84 in a suddenly expanded flow field at supersonic Mach numbers

Khan, Sher Afghan and Chaudhary, Zakir Ilahi and Baig, Maughal Ahmed Ali and Ridwan, R and Chethan, K.M. and Faheem, Mohammed (2022) Experiments on wall pressure at an area ratio 4.84 in a suddenly expanded flow field at supersonic Mach numbers. In: 2nd International Conference on Advanced Research In Mechanical Engineering (2nd ICARME – 21), 29-30 April 2021, Bangalore, India.

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Abstract

The present investigation intends to review the flow control mechanism’s effectiveness through a circular orifice of 1 mm diameter generating sonic flow at the exit even though experiments were conducted for various NPRs and a fixed level of expansion. Tests were conducted at Mach 1.87 for correct and under-expanded cases; for Mach 2.2, investigations were done at design NPR and over-expanded conditions. Lastly, for Mach 2.58, the study was over-expanded alone as the design NPR is 19.3. However, the research focuses on correctly, over, and under-expanded cases. When nozzles face adverse pressure, the control increases the pressure; when the nozzle flow is either ideally expanded or operating at NPR more than the design NPR, the control results in a decrease in pressure. The bare lowest duct size needed for the stream to stay connected is 1D for Mach 1.87 and 2D for the leftover two Mach numbers. Oscillations are observed for pipe size 6D and above, whereas, for short duct length, such fluctuations are not seen.

Item Type:	Conference or Workshop Item (Plenary Papers)
Subjects:	T Technology > TL Motor vehicles. Aeronautics. Astronautics
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:	28 Jan 2022 10:29
Last Modified:	17 Feb 2022 16:41
URI:	http://irep.iium.edu.my/id/eprint/96514

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