Analysis of area ratio in a CD nozzle with suddenly expanded duct using CFD method

Whereas the demand for missiles and rockets has exponentially augmented, but the difficulties related to the gas dynamics of these vehicles remains to be a threat. Whenever there is a sudden expansion, the pressure in the downstream is subatmospheric. This low pressure in the recirculation zone lea...

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Main Authors:	Khan, Sher Afghan, Aabid, Abdul, Ghasi, Fharukh Ahmed Mehaboobali, Al-Robaian, Abdulrahman, Alsagri, Ali Sulaiman
Format:	Article
Language:	English English
Published:	Penerbit Akademia Baru 2019
Subjects:	TL Motor vehicles. Aeronautics. Astronautics U Military Science (General)
Online Access:	http://irep.iium.edu.my/72294/ http://irep.iium.edu.my/72294/ http://irep.iium.edu.my/72294/1/72294_Analysis%20of%20Area%20Ratio%20In%20a%20CD%20Nozzle.pdf http://irep.iium.edu.my/72294/7/72294_Analysis%20of%20area%20ratio%20in%20a%20CD%20nozzle_scopus.pdf

id	iium-72294
recordtype	eprints
spelling	iium-722942019-09-02T13:15:57Z http://irep.iium.edu.my/72294/ Analysis of area ratio in a CD nozzle with suddenly expanded duct using CFD method Khan, Sher Afghan Aabid, Abdul Ghasi, Fharukh Ahmed Mehaboobali Al-Robaian, Abdulrahman Alsagri, Ali Sulaiman TL Motor vehicles. Aeronautics. Astronautics U Military Science (General) Whereas the demand for missiles and rockets has exponentially augmented, but the difficulties related to the gas dynamics of these vehicles remains to be a threat. Whenever there is a sudden expansion, the pressure in the downstream is subatmospheric. This low pressure in the recirculation zone leads to a considerable amount of drag, which is nearly two-thirds of the net drag of the aerospace vehicles. Hence, in view of the above problem, many researchers tried to control the base pressure depending upon the mission requirements. For example, in case of combustion chamber, we would like to decrease the base pressure as low as possible to have better mixing and efficient combustion, whereas, in case of the external ballistics application we would like to increase the base pressure as high as possible to reduce the drag of the projectiles to enhance the range. In this paper, investigated the effects of an area ratio in suddenly expanded duct and base pressure control with microjets using the computational fluid dynamics (CFD) method. A 1 mm orifice diameter of microjets placed at the pitch circle diameter (PCD) of 13 mm, located at 90 degrees for active control. The Mach number is M = 2.2, the L/D ratio is 8, the nozzle pressure ratio’s (NPR) is 9 and the area ratios are 2.56, 3.24, 4.86 and 6.25 considered in the present study. The design and modeling of convergent-divergent (CD) nozzle simulated using K-ε turbulence model for standard wall function. From the present results, it has been observed that the area ratio plays a crucial role in fixing the base pressure values. Penerbit Akademia Baru 2019-05-20 Article PeerReviewed application/pdf en http://irep.iium.edu.my/72294/1/72294_Analysis%20of%20Area%20Ratio%20In%20a%20CD%20Nozzle.pdf application/pdf en http://irep.iium.edu.my/72294/7/72294_Analysis%20of%20area%20ratio%20in%20a%20CD%20nozzle_scopus.pdf Khan, Sher Afghan and Aabid, Abdul and Ghasi, Fharukh Ahmed Mehaboobali and Al-Robaian, Abdulrahman and Alsagri, Ali Sulaiman (2019) Analysis of area ratio in a CD nozzle with suddenly expanded duct using CFD method. CFD Letters, 11 (5). pp. 61-71. ISSN 2180-1363 http://www.akademiabaru.com/doc/CFDLV11_N5_P61_71.pdf
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 U Military Science (General)
spellingShingle	TL Motor vehicles. Aeronautics. Astronautics U Military Science (General) Khan, Sher Afghan Aabid, Abdul Ghasi, Fharukh Ahmed Mehaboobali Al-Robaian, Abdulrahman Alsagri, Ali Sulaiman Analysis of area ratio in a CD nozzle with suddenly expanded duct using CFD method
description	Whereas the demand for missiles and rockets has exponentially augmented, but the difficulties related to the gas dynamics of these vehicles remains to be a threat. Whenever there is a sudden expansion, the pressure in the downstream is subatmospheric. This low pressure in the recirculation zone leads to a considerable amount of drag, which is nearly two-thirds of the net drag of the aerospace vehicles. Hence, in view of the above problem, many researchers tried to control the base pressure depending upon the mission requirements. For example, in case of combustion chamber, we would like to decrease the base pressure as low as possible to have better mixing and efficient combustion, whereas, in case of the external ballistics application we would like to increase the base pressure as high as possible to reduce the drag of the projectiles to enhance the range. In this paper, investigated the effects of an area ratio in suddenly expanded duct and base pressure control with microjets using the computational fluid dynamics (CFD) method. A 1 mm orifice diameter of microjets placed at the pitch circle diameter (PCD) of 13 mm, located at 90 degrees for active control. The Mach number is M = 2.2, the L/D ratio is 8, the nozzle pressure ratio’s (NPR) is 9 and the area ratios are 2.56, 3.24, 4.86 and 6.25 considered in the present study. The design and modeling of convergent-divergent (CD) nozzle simulated using K-ε turbulence model for standard wall function. From the present results, it has been observed that the area ratio plays a crucial role in fixing the base pressure values.
format	Article
author	Khan, Sher Afghan Aabid, Abdul Ghasi, Fharukh Ahmed Mehaboobali Al-Robaian, Abdulrahman Alsagri, Ali Sulaiman
author_facet	Khan, Sher Afghan Aabid, Abdul Ghasi, Fharukh Ahmed Mehaboobali Al-Robaian, Abdulrahman Alsagri, Ali Sulaiman
author_sort	Khan, Sher Afghan
title	Analysis of area ratio in a CD nozzle with suddenly expanded duct using CFD method
title_short	Analysis of area ratio in a CD nozzle with suddenly expanded duct using CFD method
title_full	Analysis of area ratio in a CD nozzle with suddenly expanded duct using CFD method
title_fullStr	Analysis of area ratio in a CD nozzle with suddenly expanded duct using CFD method
title_full_unstemmed	Analysis of area ratio in a CD nozzle with suddenly expanded duct using CFD method
title_sort	analysis of area ratio in a cd nozzle with suddenly expanded duct using cfd method
publisher	Penerbit Akademia Baru
publishDate	2019
url	http://irep.iium.edu.my/72294/ http://irep.iium.edu.my/72294/ http://irep.iium.edu.my/72294/1/72294_Analysis%20of%20Area%20Ratio%20In%20a%20CD%20Nozzle.pdf http://irep.iium.edu.my/72294/7/72294_Analysis%20of%20area%20ratio%20in%20a%20CD%20nozzle_scopus.pdf
first_indexed	2023-09-18T21:42:25Z
last_indexed	2023-09-18T21:42:25Z
_version_	1777413228580569088

Analysis of area ratio in a CD nozzle with suddenly expanded duct using CFD method

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