Influence of expansion level on base pressure and reattachment length

In high-speed projectiles like a rocket, the thrust is created by the convergent-divergent nozzle. The flow from the nozzle is exhausted in the enlarged duct of larger diameter to maximize the thrust. When the flow from the nozzle is exhausted in the enlarged duct, the base pressure gets reduced and...

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Main Authors:	Pathan, Khizar Ahmed, Dabeer, Prakash S, Khan, Sher Afghan
Format:	Article
Language:	English English
Published:	Penerbit Akademia Baru 2019
Subjects:	TL780 Rockets
Online Access:	http://irep.iium.edu.my/72296/ http://irep.iium.edu.my/72296/ http://irep.iium.edu.my/72296/1/72296_Influence%20of%20Expansion%20Level.pdf http://irep.iium.edu.my/72296/7/73657_Influence%20of%20expansion%20level%20on%20base%20pressure_Scopus.pdf

id	iium-72296
recordtype	eprints
spelling	iium-722962019-11-24T16:23:07Z http://irep.iium.edu.my/72296/ Influence of expansion level on base pressure and reattachment length Pathan, Khizar Ahmed Dabeer, Prakash S Khan, Sher Afghan TL780 Rockets In high-speed projectiles like a rocket, the thrust is created by the convergent-divergent nozzle. The flow from the nozzle is exhausted in the enlarged duct of larger diameter to maximize the thrust. When the flow from the nozzle is exhausted in the enlarged duct, the base pressure gets reduced and hence increases base drag. This paper numerically simulates and investigates the flow field and the effectiveness of the Nozzle Pressure Ratio (NPR) on the base pressure, development of the flow field in the enlarged duct, the location of reattachment point, and the reattachment length. The supersonic flow was generated by the C-D nozzle, and the same is exited in the enlarged duct of area ratio 4.84 (ratio of enlarged duct area to nozzle exit area). The base pressure and the wall pressure distribution along the enlarged duct length have been studied. The Mach numbers considered for CFD analysis are 1.5, 2.0 and 2.5. NPR and the L/D ratios of the study are from 2, 5, and 8. Based on the results it is concluded that with enhancement in NPR, the nozzle becomes under-expanded, the reattachment length is reduced and the base pressure tends to get reduced at all the parameters of the present investigation. Penerbit Akademia Baru 2019-05-20 Article PeerReviewed application/pdf en http://irep.iium.edu.my/72296/1/72296_Influence%20of%20Expansion%20Level.pdf application/pdf en http://irep.iium.edu.my/72296/7/73657_Influence%20of%20expansion%20level%20on%20base%20pressure_Scopus.pdf Pathan, Khizar Ahmed and Dabeer, Prakash S and Khan, Sher Afghan (2019) Influence of expansion level on base pressure and reattachment length. CFD Letters, 11 (5). pp. 22-36. ISSN 2180-1363 http://www.akademiabaru.com/doc/CFDLV11_N5_P22_36.pdf
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, Khizar Ahmed Dabeer, Prakash S Khan, Sher Afghan Influence of expansion level on base pressure and reattachment length
description	In high-speed projectiles like a rocket, the thrust is created by the convergent-divergent nozzle. The flow from the nozzle is exhausted in the enlarged duct of larger diameter to maximize the thrust. When the flow from the nozzle is exhausted in the enlarged duct, the base pressure gets reduced and hence increases base drag. This paper numerically simulates and investigates the flow field and the effectiveness of the Nozzle Pressure Ratio (NPR) on the base pressure, development of the flow field in the enlarged duct, the location of reattachment point, and the reattachment length. The supersonic flow was generated by the C-D nozzle, and the same is exited in the enlarged duct of area ratio 4.84 (ratio of enlarged duct area to nozzle exit area). The base pressure and the wall pressure distribution along the enlarged duct length have been studied. The Mach numbers considered for CFD analysis are 1.5, 2.0 and 2.5. NPR and the L/D ratios of the study are from 2, 5, and 8. Based on the results it is concluded that with enhancement in NPR, the nozzle becomes under-expanded, the reattachment length is reduced and the base pressure tends to get reduced at all the parameters of the present investigation.
format	Article
author	Pathan, Khizar Ahmed Dabeer, Prakash S Khan, Sher Afghan
author_facet	Pathan, Khizar Ahmed Dabeer, Prakash S Khan, Sher Afghan
author_sort	Pathan, Khizar Ahmed
title	Influence of expansion level on base pressure and reattachment length
title_short	Influence of expansion level on base pressure and reattachment length
title_full	Influence of expansion level on base pressure and reattachment length
title_fullStr	Influence of expansion level on base pressure and reattachment length
title_full_unstemmed	Influence of expansion level on base pressure and reattachment length
title_sort	influence of expansion level on base pressure and reattachment length
publisher	Penerbit Akademia Baru
publishDate	2019
url	http://irep.iium.edu.my/72296/ http://irep.iium.edu.my/72296/ http://irep.iium.edu.my/72296/1/72296_Influence%20of%20Expansion%20Level.pdf http://irep.iium.edu.my/72296/7/73657_Influence%20of%20expansion%20level%20on%20base%20pressure_Scopus.pdf
first_indexed	2023-09-18T21:42:26Z
last_indexed	2023-09-18T21:42:26Z
_version_	1777413228871024640

Influence of expansion level on base pressure and reattachment length

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