Active control of base pressure with counter clockwise rotating cylinder at Mach 2

Asadullah, Mohammed and Khan, Sher Afghan and Asrar, Waqar (2018) Active control of base pressure with counter clockwise rotating cylinder at Mach 2. In: 4th IEEE International Conference on Engineering Technologies and Applied Sciences, ICETAS 2017, 29 November - 1 December 2017, AMA International University Salmabad; Bahrain.

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Abstract

The effect of dynamic cylinder as an active controller to control the base pressure for different level of expansion have been experimentally investigated at Mach 2 through CD nozzle for area ratio 9. Solitary counter clockwise rotating cylinder of 2 mm diameter when seen from top, at 2 mm from side wall of square duct and 8 mm from square nozzle exit in the base region is mounted as a controller. Base pressure in the wake area after sudden expansion of jets from the exit of nozzle has been measured. The length-to-width ratio of sudden expansion duct taken is 10. The experiments were carried out by operating jets for different nozzle pressure ratios (NPR). The wall pressure distribution was also measured for with and without control cases in the duct to see that the amplitude of oscillations does not adversely influence the flow field in the duct. Counter clockwise rotating cylinder as an active controller were found to increase the base pressure as high as 62 percent at NPR 8.5 and 53 percent at NPR 7.8. The control effectiveness is marginal for over expanded nozzles. The wall pressure flow field with and without control are identical with minor fluctuations.

Item Type:	Conference or Workshop Item (Plenary Papers)
Additional Information:	7395/67151
Uncontrolled Keywords:	Base pressure; Wall pressure; Nozzle pressure ratio; Mach number; Active control
Subjects:	T Technology > T Technology (General) T Technology > TJ Mechanical engineering and machinery
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:	29 Oct 2018 14:34
Last Modified:	08 Aug 2019 16:58
URI:	http://irep.iium.edu.my/id/eprint/67151

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