Experimental investigation of the base flow and base pressure of sudden expansion nozzle

This paper presents an experimental investigation of an airflow from convergent- divergent axisymmetric nozzles expanded suddenly into circular duct of larger cross- sectional area than that of nozzle exit area, focusing attention on the base pressure and the flow development in the duct. To investi...

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Main Authors:	Saleel, Ahmed, Baig, Maughal Ahmed Ali, Khan, Sher Afghan
Format:	Conference or Workshop Item
Language:	English English English
Published:	Institute of Physics Publishing 2018
Subjects:	TJ Mechanical engineering and machinery
Online Access:	http://irep.iium.edu.my/70786/ http://irep.iium.edu.my/70786/ http://irep.iium.edu.my/70786/ http://irep.iium.edu.my/70786/2/70786_Experimental%20investigation%20of%20the%20base%20flow_SCOPUS.pdf http://irep.iium.edu.my/70786/9/70786_Experimental%20investigation%20of%20the%20base%20flow.pdf http://irep.iium.edu.my/70786/10/70786_Experimental%20investigation%20of%20the%20base%20flow%20_WOS.pdf

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spelling	iium-707862019-02-18T08:04:59Z http://irep.iium.edu.my/70786/ Experimental investigation of the base flow and base pressure of sudden expansion nozzle Saleel, Ahmed Baig, Maughal Ahmed Ali Khan, Sher Afghan TJ Mechanical engineering and machinery This paper presents an experimental investigation of an airflow from convergent- divergent axisymmetric nozzles expanded suddenly into circular duct of larger cross- sectional area than that of nozzle exit area, focusing attention on the base pressure and the flow development in the duct. To investigate the influence of area ratios and nozzle pressure ratios on the flow field developed in the duct, the micro jets of 1 mm orifice diameter located at 900 interval along a pitch circle diameter 1.3 times the nozzle exit diameter were employed as the controller of the base pressure. The Mach number investigated in the present study was 1.87, 2.2 and 2.58. The area ratios of the present study are 2.56, 3.24, 4.84 and 6.25. The nozzle pressure ratio (NPR) used were 3 and 5. The length-to-diameter ratio of the enlarged duct was varied from 10 to 1.The level of expansion at the nozzle exit (i.e. before sudden expansion) influences the wall pressure very strongly. From the results it is observed that for NPRs 3 there is no appreciable gain in the base pressure, and hence control employed in the form of micro jets is not effective for this NPR, however, at NPR 5, there is significant change in the base pressure values for all the area ratios. This clearly indicates that the level of expansion plays an important role to dictate the value of the base pressure and ultimately the control effectiveness by the micro jets. Institute of Physics Publishing 2018 Conference or Workshop Item PeerReviewed application/pdf en http://irep.iium.edu.my/70786/2/70786_Experimental%20investigation%20of%20the%20base%20flow_SCOPUS.pdf application/pdf en http://irep.iium.edu.my/70786/9/70786_Experimental%20investigation%20of%20the%20base%20flow.pdf application/pdf en http://irep.iium.edu.my/70786/10/70786_Experimental%20investigation%20of%20the%20base%20flow%20_WOS.pdf Saleel, Ahmed and Baig, Maughal Ahmed Ali and Khan, Sher Afghan (2018) Experimental investigation of the base flow and base pressure of sudden expansion nozzle. In: International Conference on Aerospace and Mechanical Engineering (AeroMech17), 21st-22nd November 2017, Batu Ferringhi, Penang. https://iopscience.iop.org/article/10.1088/1757-899X/370/1/012052 10.1088/1757-899X/370/1/012052
repository_type	Digital Repository
institution_category	Local University
institution	International Islamic University Malaysia
building	IIUM Repository
collection	Online Access
language	English English English
topic	TJ Mechanical engineering and machinery
spellingShingle	TJ Mechanical engineering and machinery Saleel, Ahmed Baig, Maughal Ahmed Ali Khan, Sher Afghan Experimental investigation of the base flow and base pressure of sudden expansion nozzle
description	This paper presents an experimental investigation of an airflow from convergent- divergent axisymmetric nozzles expanded suddenly into circular duct of larger cross- sectional area than that of nozzle exit area, focusing attention on the base pressure and the flow development in the duct. To investigate the influence of area ratios and nozzle pressure ratios on the flow field developed in the duct, the micro jets of 1 mm orifice diameter located at 900 interval along a pitch circle diameter 1.3 times the nozzle exit diameter were employed as the controller of the base pressure. The Mach number investigated in the present study was 1.87, 2.2 and 2.58. The area ratios of the present study are 2.56, 3.24, 4.84 and 6.25. The nozzle pressure ratio (NPR) used were 3 and 5. The length-to-diameter ratio of the enlarged duct was varied from 10 to 1.The level of expansion at the nozzle exit (i.e. before sudden expansion) influences the wall pressure very strongly. From the results it is observed that for NPRs 3 there is no appreciable gain in the base pressure, and hence control employed in the form of micro jets is not effective for this NPR, however, at NPR 5, there is significant change in the base pressure values for all the area ratios. This clearly indicates that the level of expansion plays an important role to dictate the value of the base pressure and ultimately the control effectiveness by the micro jets.
format	Conference or Workshop Item
author	Saleel, Ahmed Baig, Maughal Ahmed Ali Khan, Sher Afghan
author_facet	Saleel, Ahmed Baig, Maughal Ahmed Ali Khan, Sher Afghan
author_sort	Saleel, Ahmed
title	Experimental investigation of the base flow and base pressure of sudden expansion nozzle
title_short	Experimental investigation of the base flow and base pressure of sudden expansion nozzle
title_full	Experimental investigation of the base flow and base pressure of sudden expansion nozzle
title_fullStr	Experimental investigation of the base flow and base pressure of sudden expansion nozzle
title_full_unstemmed	Experimental investigation of the base flow and base pressure of sudden expansion nozzle
title_sort	experimental investigation of the base flow and base pressure of sudden expansion nozzle
publisher	Institute of Physics Publishing
publishDate	2018
url	http://irep.iium.edu.my/70786/ http://irep.iium.edu.my/70786/ http://irep.iium.edu.my/70786/ http://irep.iium.edu.my/70786/2/70786_Experimental%20investigation%20of%20the%20base%20flow_SCOPUS.pdf http://irep.iium.edu.my/70786/9/70786_Experimental%20investigation%20of%20the%20base%20flow.pdf http://irep.iium.edu.my/70786/10/70786_Experimental%20investigation%20of%20the%20base%20flow%20_WOS.pdf
first_indexed	2023-09-18T21:40:28Z
last_indexed	2023-09-18T21:40:28Z
_version_	1777413106079629312

Experimental investigation of the base flow and base pressure of sudden expansion nozzle

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