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Control of CD nozzle flow using microjets at Mach 2.1

Akhtar, Mohammad Nishat and Abu Bakar, Elmi and Aabid, Abdul and Khan, Sher Afghan (2019) Control of CD nozzle flow using microjets at Mach 2.1. International Journal of Innovative Technology and Exploring Engineering (IJITEE), 8 (9S2). pp. 631-635. ISSN 2278-3075

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Abstract

This paper reports the outcome of the wind tunnel investigation performed to study the effectiveness of the control jets to regulate the base pressure in an abruptly expanded circular pipe. Tiny jets four in a number, of 1 mm orifice diameter located at ninety degrees in cross shape along a pitch circle diameter (PCD) of 1.3 as a control mechanism were employed. The Mach numbers and the area ratio of the study were 2.1, and 4.84. The length-to-diameter (L/D) ratio of the duct tested was varied from 10 to 1. Nature of the flow in the duct, as well as static wall pressure distribution in the suddenly enlarged duct, was recorded. The main aim of this study was to assess the influence of the active control in the form of tiny jets on the flow field as well as the nature of the flow, and also the development of the flow in the duct. The results obtained in this study show that the flow field, as well as the wall pressure distribution, is not adversely influenced by the tiny jets. The minimum duct length seems to be 2D for NPR's in the range five and above. However, for all the level of expansion of the present study, the minimum duct length needed for the flow to remain attached seems to be 3D.

Item Type: Article (Journal)
Additional Information: 7395/74734
Uncontrolled Keywords: Nozzle, Area ratio, Nozzle pressure ratio, Microjet, Flow Control.
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: 01 Oct 2019 10:53
Last Modified: 19 Nov 2019 08:40
URI: http://irep.iium.edu.my/id/eprint/74734

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