An investigation to control base pressure in suddenly expanded flows

In suddenly expanded flows, due to the abrupt expansion of the flow from a nozzle into an enlarged duct, the pressure reduces in the base region of the enlarged duct which increases the base drag. The techniques used to increase the base pressure are namely passive control technique and active cont...

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Main Authors:	Pathan, Khizer Ahmed, Dabeer, P S, Khan, Sher Afghan
Format:	Article
Language:	English English
Published:	Praise Worthy Prize 2018
Subjects:	TL Motor vehicles. Aeronautics. Astronautics
Online Access:	http://irep.iium.edu.my/67164/ http://irep.iium.edu.my/67164/ http://irep.iium.edu.my/67164/ http://irep.iium.edu.my/67164/1/67164_An%20Investigation%20to%20Control%20Base.pdf http://irep.iium.edu.my/67164/7/67164_An%20investigation%20to%20control%20base%20pressure_scopus.pdf

id	iium-67164
recordtype	eprints
spelling	iium-671642019-02-12T07:49:01Z http://irep.iium.edu.my/67164/ An investigation to control base pressure in suddenly expanded flows Pathan, Khizer Ahmed Dabeer, P S Khan, Sher Afghan TL Motor vehicles. Aeronautics. Astronautics In suddenly expanded flows, due to the abrupt expansion of the flow from a nozzle into an enlarged duct, the pressure reduces in the base region of the enlarged duct which increases the base drag. The techniques used to increase the base pressure are namely passive control technique and active control technique. In passive control technique the geometrical modifications are employed by providing splitter plates, ribs, cavities etc. while in active control technique the secondary control jets are provided in the base region of an enlarged duct to increase base pressure up to atmospheric pressure. The air blowing pressure from secondary control jets should be optimum. This paper presents the computational fluid dynamic (CFD) analysis to optimize blowing pressure ratio i.e. the ratio of inlet pressure of control jets to the atmospheric pressure, to increase base pressure up to atmospheric pressure in the base region of an enlarged duct. In the present study, CFD analysis was carried out for different air blowing pressure ratios to optimize it. Flow and geometry parameters considered for the analysis are Mach number, area ratio, nozzle pressure ratio and blowing pressure ratio. Mach numbers considered for analysis are 1.5, 2.0 and 2.5. Area ratios and nozzle pressure ratios considered for analysis are 2, 5 and 8. The CFD analysis is done for different combinations of Mach numbers, area ratios, and the nozzle pressure ratios by varying blowing pressure ratio from 2 to 8 in step of 1. Based on analysis results anyone can select optimum value of blowing pressure ratio at a given Mach number, area ratio and nozzle pressure ratio to increase base pressure nearly up to atmospheric pressure. Praise Worthy Prize 2018-08 Article PeerReviewed application/pdf en http://irep.iium.edu.my/67164/1/67164_An%20Investigation%20to%20Control%20Base.pdf application/pdf en http://irep.iium.edu.my/67164/7/67164_An%20investigation%20to%20control%20base%20pressure_scopus.pdf Pathan, Khizer Ahmed and Dabeer, P S and Khan, Sher Afghan (2018) An investigation to control base pressure in suddenly expanded flows. International Review of Aerospace Engineering (IREASE), 11 (4). pp. 162-169. ISSN 1973-7459 E-ISSN 2533-2279 hhttps://www.praiseworthyprize.org/jsm/index.php?journal=irease&page=article&op=view&path%5B%5D=22149 10.15866/irease.v11i4.14675
repository_type	Digital Repository
institution_category	Local University
institution	International Islamic University Malaysia
building	IIUM Repository
collection	Online Access
language	English English
topic	TL Motor vehicles. Aeronautics. Astronautics
spellingShingle	TL Motor vehicles. Aeronautics. Astronautics Pathan, Khizer Ahmed Dabeer, P S Khan, Sher Afghan An investigation to control base pressure in suddenly expanded flows
description	In suddenly expanded flows, due to the abrupt expansion of the flow from a nozzle into an enlarged duct, the pressure reduces in the base region of the enlarged duct which increases the base drag. The techniques used to increase the base pressure are namely passive control technique and active control technique. In passive control technique the geometrical modifications are employed by providing splitter plates, ribs, cavities etc. while in active control technique the secondary control jets are provided in the base region of an enlarged duct to increase base pressure up to atmospheric pressure. The air blowing pressure from secondary control jets should be optimum. This paper presents the computational fluid dynamic (CFD) analysis to optimize blowing pressure ratio i.e. the ratio of inlet pressure of control jets to the atmospheric pressure, to increase base pressure up to atmospheric pressure in the base region of an enlarged duct. In the present study, CFD analysis was carried out for different air blowing pressure ratios to optimize it. Flow and geometry parameters considered for the analysis are Mach number, area ratio, nozzle pressure ratio and blowing pressure ratio. Mach numbers considered for analysis are 1.5, 2.0 and 2.5. Area ratios and nozzle pressure ratios considered for analysis are 2, 5 and 8. The CFD analysis is done for different combinations of Mach numbers, area ratios, and the nozzle pressure ratios by varying blowing pressure ratio from 2 to 8 in step of 1. Based on analysis results anyone can select optimum value of blowing pressure ratio at a given Mach number, area ratio and nozzle pressure ratio to increase base pressure nearly up to atmospheric pressure.
format	Article
author	Pathan, Khizer Ahmed Dabeer, P S Khan, Sher Afghan
author_facet	Pathan, Khizer Ahmed Dabeer, P S Khan, Sher Afghan
author_sort	Pathan, Khizer Ahmed
title	An investigation to control base pressure in suddenly expanded flows
title_short	An investigation to control base pressure in suddenly expanded flows
title_full	An investigation to control base pressure in suddenly expanded flows
title_fullStr	An investigation to control base pressure in suddenly expanded flows
title_full_unstemmed	An investigation to control base pressure in suddenly expanded flows
title_sort	investigation to control base pressure in suddenly expanded flows
publisher	Praise Worthy Prize
publishDate	2018
url	http://irep.iium.edu.my/67164/ http://irep.iium.edu.my/67164/ http://irep.iium.edu.my/67164/ http://irep.iium.edu.my/67164/1/67164_An%20Investigation%20to%20Control%20Base.pdf http://irep.iium.edu.my/67164/7/67164_An%20investigation%20to%20control%20base%20pressure_scopus.pdf
first_indexed	2023-09-18T21:35:21Z
last_indexed	2023-09-18T21:35:21Z
_version_	1777412784124854272

An investigation to control base pressure in suddenly expanded flows

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