Passive control of base pressure with static cylinder at supersonic flow

An experimental investigation for over expanded, perfectly expanded and under expanded supersonic jets is presented to study the effectiveness of a static cylinder to reduce base drag at Mach 2 through a converging diverging nozzle for a cross-sectional duct nozzle area ratio of 9. A static cylinder...

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Main Authors:	Asadullah, Mohammed, Khan, Sher Afghan, Asrar, Waqar, Sulaeman, Erwin
Format:	Conference or Workshop Item
Language:	English English
Published:	Institute of Physics Publishing 2018
Subjects:	TJ241 Machine construction (General)
Online Access:	http://irep.iium.edu.my/65383/ http://irep.iium.edu.my/65383/ http://irep.iium.edu.my/65383/ http://irep.iium.edu.my/65383/1/65383_Passive%20control%20of%20base%20pressure.pdf http://irep.iium.edu.my/65383/2/65383_Passive%20control%20of%20base%20pressure_SCOPUS.pdf

id	iium-65383
recordtype	eprints
spelling	iium-653832018-08-03T01:33:41Z http://irep.iium.edu.my/65383/ Passive control of base pressure with static cylinder at supersonic flow Asadullah, Mohammed Khan, Sher Afghan Asrar, Waqar Sulaeman, Erwin TJ241 Machine construction (General) An experimental investigation for over expanded, perfectly expanded and under expanded supersonic jets is presented to study the effectiveness of a static cylinder to reduce base drag at Mach 2 through a converging diverging nozzle for a cross-sectional duct nozzle area ratio of 9. A static cylinder of 2 mm diameter at 2 mm from the side wall of a square duct and 8 mm from the square nozzle exit in the base region is installed as a passive control device. Base pressures in the wake flow after sudden expansion of jets in to a square nozzle have been measured. The length width ratio of the duct is 10. The jets were operated at different nozzle pressure ratios in the range from 2 to 9. The flow field in the square duct was also observed for all cases. Static cylinder as a passive controller was found to reduce the base drag as high as 59 percent at NPR = 9 and 14 percent at NPR = 6. The base pressure depends on Mach number, area ratio, length to width ratio, and nozzle pressure ratio (NPR). When flow from the nozzle is over expanded, the static control is ineffective till NPR is 6. The level of expansion plays a vital role. The flow flux in the square duct remains almost identical with and without control for most of the cases. However, at higher NPRs namely 6, 7.8, and 9 the control results in an increase as well as a decrease in the wall pressure along the duct. Passive control of the base flow is effective for higher NPRs. The flow field for perfectly expanded nozzle is dominated by the shock waves. © Published under licence by IOP Publishing Ltd. Institute of Physics Publishing 2018 Conference or Workshop Item PeerReviewed application/pdf en http://irep.iium.edu.my/65383/1/65383_Passive%20control%20of%20base%20pressure.pdf application/pdf en http://irep.iium.edu.my/65383/2/65383_Passive%20control%20of%20base%20pressure_SCOPUS.pdf Asadullah, Mohammed and Khan, Sher Afghan and Asrar, Waqar and Sulaeman, Erwin (2018) Passive control of base pressure with static cylinder at supersonic flow. In: 1st International Conference on Aerospace and Mechanical Engineering (AeroMech 2017), 21st-22nd Nov. 2017, Pulau Pinang. http://iopscience.iop.org/article/10.1088/1757-899X/370/1/012050 10.1088/1757-899X/370/1/012050
repository_type	Digital Repository
institution_category	Local University
institution	International Islamic University Malaysia
building	IIUM Repository
collection	Online Access
language	English English
topic	TJ241 Machine construction (General)
spellingShingle	TJ241 Machine construction (General) Asadullah, Mohammed Khan, Sher Afghan Asrar, Waqar Sulaeman, Erwin Passive control of base pressure with static cylinder at supersonic flow
description	An experimental investigation for over expanded, perfectly expanded and under expanded supersonic jets is presented to study the effectiveness of a static cylinder to reduce base drag at Mach 2 through a converging diverging nozzle for a cross-sectional duct nozzle area ratio of 9. A static cylinder of 2 mm diameter at 2 mm from the side wall of a square duct and 8 mm from the square nozzle exit in the base region is installed as a passive control device. Base pressures in the wake flow after sudden expansion of jets in to a square nozzle have been measured. The length width ratio of the duct is 10. The jets were operated at different nozzle pressure ratios in the range from 2 to 9. The flow field in the square duct was also observed for all cases. Static cylinder as a passive controller was found to reduce the base drag as high as 59 percent at NPR = 9 and 14 percent at NPR = 6. The base pressure depends on Mach number, area ratio, length to width ratio, and nozzle pressure ratio (NPR). When flow from the nozzle is over expanded, the static control is ineffective till NPR is 6. The level of expansion plays a vital role. The flow flux in the square duct remains almost identical with and without control for most of the cases. However, at higher NPRs namely 6, 7.8, and 9 the control results in an increase as well as a decrease in the wall pressure along the duct. Passive control of the base flow is effective for higher NPRs. The flow field for perfectly expanded nozzle is dominated by the shock waves. © Published under licence by IOP Publishing Ltd.
format	Conference or Workshop Item
author	Asadullah, Mohammed Khan, Sher Afghan Asrar, Waqar Sulaeman, Erwin
author_facet	Asadullah, Mohammed Khan, Sher Afghan Asrar, Waqar Sulaeman, Erwin
author_sort	Asadullah, Mohammed
title	Passive control of base pressure with static cylinder at supersonic flow
title_short	Passive control of base pressure with static cylinder at supersonic flow
title_full	Passive control of base pressure with static cylinder at supersonic flow
title_fullStr	Passive control of base pressure with static cylinder at supersonic flow
title_full_unstemmed	Passive control of base pressure with static cylinder at supersonic flow
title_sort	passive control of base pressure with static cylinder at supersonic flow
publisher	Institute of Physics Publishing
publishDate	2018
url	http://irep.iium.edu.my/65383/ http://irep.iium.edu.my/65383/ http://irep.iium.edu.my/65383/ http://irep.iium.edu.my/65383/1/65383_Passive%20control%20of%20base%20pressure.pdf http://irep.iium.edu.my/65383/2/65383_Passive%20control%20of%20base%20pressure_SCOPUS.pdf
first_indexed	2023-09-18T21:32:46Z
last_indexed	2023-09-18T21:32:46Z
_version_	1777412621415219200

Passive control of base pressure with static cylinder at supersonic flow

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