Control of nozzle flow using microjets at supersonic Mach Regime

G M, Fharukh and Khan, Sher Afghan (2019) Control of nozzle flow using microjets at supersonic Mach Regime. International Journal of Engineering, 32 (7). pp. 991-998. ISSN 1025-2495 E-ISSN 1735-9244

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Abstract

This article reports the active control of base flows using the experimental procedure. Active control of base pressure helps in reducing the base drag in aerodynamic devices having suddenly expanded flows. Active control in the form of microjets having 0.5 mm radius placed at forty-five degrees apart is employed to control the base pressure. The Mach numbers of the present analysis are 1.7, 2.3, and 2.7. The length to diameter (L/D) ratio is varied from 10 to 1 and the nozzle pressure ratio (NPR) being changed from 1 to 10 in steps of 1 for base pressure measurements. The area ratio for the entire analysis is fixed at 2.56. Wall pressure distribution along the enlarged duct is also recorded. No change in base pressure increase/decrease is thoroughly analyzed as well. From the experimental investigation, it is found that control plays an important in modifying the base pressure without disturbing the wall pressure distribution. The base pressure variation is entirely different at L/D = 1 compared to a higher L/D ratio due to change in reattachment length and the requirement of the duct length at higher inertia levels. The quality of the flow in the duct in the presence and absence of control remained the same.

Item Type:	Article (Journal)
Additional Information:	7395/73710
Uncontrolled Keywords:	Active Control, Area Ratio, Base Drag, Base Flow, Base Pressure, Micro Jets
Subjects:	T Technology > TL Motor vehicles. Aeronautics. Astronautics 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:	26 Aug 2019 09:40
Last Modified:	05 Apr 2020 08:39
URI:	http://irep.iium.edu.my/id/eprint/73710

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