Benefit of Mach number and expansion level on the flow development in a cylindrical tube diameter of 18 mm

Khan, Sher Afghan and Baig, Maughal Ahmed Ali and Ridwan, R and Rayid, Muneer and Suheel, J I and Faheem, Mohammed (2021) Benefit of Mach number and expansion level on the flow development in a cylindrical tube diameter of 18 mm. In: 2021 International Conference on Technology Innovation in Mechanical Engineering, TIME 2021, 22 - 23 April 2021, Bhopal.

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Abstract

In this paper, experiments are performed at high Mach numbers to examine the flow control effect located in the separated region at 6.5 mm from the central jet. A circular orifice is placed in the wake region to manipulate the base flow to boost the wake area’s pressure and ultimately reduce the base drag. The study also investigates the impact of micro-jets on the stream of the tube. Accordingly, tests are conducted using C-D nozzles fabricated at Mach 1.87, 2.2, and 2.58. Flow generated from these nozzles is exhausted in a duct whose diameter is 18 mm. The results show that for duct length 6D and above, the flow field inside the duct becomes oscillatory, whereas such fluctuations are not noticed when duct size is less than 4D. Dynamic control shows mixed trends when jets are operating at design NPR or under the impact of favorable pressure. And within reattachment length, active flow control is not able to impact the flow pattern. When nozzles are running underneath, over-expansion and flow control are initiated; it decreases the duct’s pressure. The smallest duct size essential for the stream to continue connected appears to be 1D for Mach 1.87 and Mach 2.2 and 2.58; this requirement is 2D.

Item Type:	Conference or Workshop Item (Plenary Papers)
Uncontrolled Keywords:	Duct static pressure Flow relaxation C-D nozzle Dynamic control Control jets Sudden expansion
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 Kulliyyah of Engineering > Department of Mechanical Engineering
Depositing User:	Prof. Dr. Sher Afghan Khan
Date Deposited:	20 Oct 2021 11:56
Last Modified:	08 Nov 2021 15:34
URI:	http://irep.iium.edu.my/id/eprint/93148

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