Effects of micro jets on the flow field of the duct with sudden expansion

Akhtar, Mohammad Nishat and Abu Bakar, Elmi and Aabid, Abdul and Khan, Sher Afghan (2019) Effects of micro jets on the flow field of the duct with sudden expansion. International Journal of Innovative Technology and Exploring Engineering (IJITEE), 8 (9S2). pp. 636-640. E-ISSN 2277-3075

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Abstract

This paper presents the results of an experimental investigation to study the effectiveness of the control jets to control base pressure in rapidly expanded circular tubes. Four tiny jets of 1 mm orifice diameter located at ninety degrees interval in cross shape along a pitch circle diameter of 1.3. The Mach number, the L/D ratio, and the area ratio of the study were 2.8, from 1 to 10, and 4.84, respectively. The nature of the flow field, the development of the flow in the duct, as well as the static wall pressure distribution in the duct was measured and discussed. The results indicate that the tiny jets can be used as an active dynamic controller for the base pressure. The wall pressure distribution is not adversely influenced by the small jets. From the present investigation, it is evident that for a given Mach number and nozzle pressure ratio one can identify the minimum duct L/D needed for the flow remained attached with the wall of the duct. The trend for the duct length L = 5D seems to show different results, due to the influence of back pressure and the peak pressure values are also less than that those were for higher L/D ratios, especially in respect of L/D = 5. Further, the flow field has smoothened in the duct, and wall pressure values with and without micro jets are identical. This trend continues until L/D = 4, then later for lower L/Ds like L/D = 3, the flow seems to be attached at higher NPRs. But for lower NPRs the flow is not attached.

Item Type:	Article (Journal)
Additional Information:	7395/74735
Uncontrolled Keywords:	Nozzle, Area ratio, Nozzle pressure ratio, Microjet, Flow Control, micro jets, flow field of the dutch
Subjects:	T Technology > TL Motor vehicles. Aeronautics. Astronautics T Technology > TL Motor vehicles. Aeronautics. Astronautics > TL500 Aeronautics
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:	02 Oct 2019 13:09
Last Modified:	24 Nov 2019 23:49
URI:	http://irep.iium.edu.my/id/eprint/74735

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