Effect of nozzle pressure ratio and control jets location to control base pressure in suddenly expanded flows

In this paper, computational fluid dynamic (CFD) analysis and experiments have been carried out to study the effect of nozzle pressure ratio, i.e. the ratio of inlet pressure to atmospheric pressure, and the pitch circle diameter of the control jets to regulate the base pressure. The variables consi...

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Main Authors:	Pathan, Khizer Ahmed, Dabeer, Prakash S, Khan, Sher Afghan
Format:	Article
Language:	English English
Published:	REGIONAL INFORMATION CENTER FOR SCIENCE AND TECHNOLOGY 2019
Subjects:	TL780 Rockets
Online Access:	http://irep.iium.edu.my/72736/ http://irep.iium.edu.my/72736/ http://irep.iium.edu.my/72736/ http://irep.iium.edu.my/72736/7/72736%20Effect%20of%20Nozzle%20Pressure%20Ratio.pdf http://irep.iium.edu.my/72736/13/72736_Effect%20of%20nozzle%20pressure_scopus.pdf

id	iium-72736
recordtype	eprints
spelling	iium-727362019-11-24T15:40:26Z http://irep.iium.edu.my/72736/ Effect of nozzle pressure ratio and control jets location to control base pressure in suddenly expanded flows Pathan, Khizer Ahmed Dabeer, Prakash S Khan, Sher Afghan TL780 Rockets In this paper, computational fluid dynamic (CFD) analysis and experiments have been carried out to study the effect of nozzle pressure ratio, i.e. the ratio of inlet pressure to atmospheric pressure, and the pitch circle diameter of the control jets to regulate the base pressure. The variables considered for the analysis as well as the experiments are the nozzle pressure ratio (NPR), the Mach number (M) and the pitch circle diameter (PCD) of the control jets. The area ratio considered for the study is kept constant at 4.84 while the length to diameter (L/D) ratio of an enlarged duct is set constant at 5. The inertia parameter considered for the study is the Mach number. The Mach numbers considered for the study are 1.5, 2.0, and 2.5. The nozzle pressure ratio considered for the study is 2, 5 and 8. Three different pitch circle diameters of control jets considered for the study are 13.1 mm, 16.2 mm and 19.3 mm. From the numerical simulations and the results of the experimental tests, it is found that the control jets are very beneficial to increase the base pressure at higher NPR when the jets issuing from the nozzles are under-expanded. The control jets were able to increase the base pressure value from 160% to 400% at a nozzle pressure ratio 8. It is concluded that the parameter D3 is the most effective pitch circle diameter of the control jets to increase the base pressure. REGIONAL INFORMATION CENTER FOR SCIENCE AND TECHNOLOGY 2019-07 Article PeerReviewed application/pdf en http://irep.iium.edu.my/72736/7/72736%20Effect%20of%20Nozzle%20Pressure%20Ratio.pdf application/pdf en http://irep.iium.edu.my/72736/13/72736_Effect%20of%20nozzle%20pressure_scopus.pdf Pathan, Khizer Ahmed and Dabeer, Prakash S and Khan, Sher Afghan (2019) Effect of nozzle pressure ratio and control jets location to control base pressure in suddenly expanded flows. Journal of Applied Fluid Mechanics, 12 (4). pp. 1127-1135. ISSN 1735-3572 E-ISSN 1735-3645 http://jafmonline.net/web/guest/home 10.29252/jafm.12.04.29495
repository_type	Digital Repository
institution_category	Local University
institution	International Islamic University Malaysia
building	IIUM Repository
collection	Online Access
language	English English
topic	TL780 Rockets
spellingShingle	TL780 Rockets Pathan, Khizer Ahmed Dabeer, Prakash S Khan, Sher Afghan Effect of nozzle pressure ratio and control jets location to control base pressure in suddenly expanded flows
description	In this paper, computational fluid dynamic (CFD) analysis and experiments have been carried out to study the effect of nozzle pressure ratio, i.e. the ratio of inlet pressure to atmospheric pressure, and the pitch circle diameter of the control jets to regulate the base pressure. The variables considered for the analysis as well as the experiments are the nozzle pressure ratio (NPR), the Mach number (M) and the pitch circle diameter (PCD) of the control jets. The area ratio considered for the study is kept constant at 4.84 while the length to diameter (L/D) ratio of an enlarged duct is set constant at 5. The inertia parameter considered for the study is the Mach number. The Mach numbers considered for the study are 1.5, 2.0, and 2.5. The nozzle pressure ratio considered for the study is 2, 5 and 8. Three different pitch circle diameters of control jets considered for the study are 13.1 mm, 16.2 mm and 19.3 mm. From the numerical simulations and the results of the experimental tests, it is found that the control jets are very beneficial to increase the base pressure at higher NPR when the jets issuing from the nozzles are under-expanded. The control jets were able to increase the base pressure value from 160% to 400% at a nozzle pressure ratio 8. It is concluded that the parameter D3 is the most effective pitch circle diameter of the control jets to increase the base pressure.
format	Article
author	Pathan, Khizer Ahmed Dabeer, Prakash S Khan, Sher Afghan
author_facet	Pathan, Khizer Ahmed Dabeer, Prakash S Khan, Sher Afghan
author_sort	Pathan, Khizer Ahmed
title	Effect of nozzle pressure ratio and control jets location to control base pressure in suddenly expanded flows
title_short	Effect of nozzle pressure ratio and control jets location to control base pressure in suddenly expanded flows
title_full	Effect of nozzle pressure ratio and control jets location to control base pressure in suddenly expanded flows
title_fullStr	Effect of nozzle pressure ratio and control jets location to control base pressure in suddenly expanded flows
title_full_unstemmed	Effect of nozzle pressure ratio and control jets location to control base pressure in suddenly expanded flows
title_sort	effect of nozzle pressure ratio and control jets location to control base pressure in suddenly expanded flows
publisher	REGIONAL INFORMATION CENTER FOR SCIENCE AND TECHNOLOGY
publishDate	2019
url	http://irep.iium.edu.my/72736/ http://irep.iium.edu.my/72736/ http://irep.iium.edu.my/72736/ http://irep.iium.edu.my/72736/7/72736%20Effect%20of%20Nozzle%20Pressure%20Ratio.pdf http://irep.iium.edu.my/72736/13/72736_Effect%20of%20nozzle%20pressure_scopus.pdf
first_indexed	2023-09-18T21:43:06Z
last_indexed	2023-09-18T21:43:06Z
_version_	1777413271188406272

Effect of nozzle pressure ratio and control jets location to control base pressure in suddenly expanded flows

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