Experimental investigation of flow through convergent nozzle and the influence of micro jets on the enlarged duct flow field

Airflow from convergent axi-symmetric nozzle expanded suddenly into circular duct of larger cross-sectional area than that of nozzle exit area were studied experimentally, focusing attention on the wall pressure and the flow development in the enlarged duct. The flow parameters considered in this i...

Full description

Bibliographic Details
Main Authors:	Ashfaq, Syed, Khan, Sher Afghan
Format:	Article
Language:	English
Published:	International Publisher for Advanced Scientific Journals (IPASJ) 2014
Subjects:	TL500 Aeronautics
Online Access:	http://irep.iium.edu.my/49918/ http://irep.iium.edu.my/49918/ http://irep.iium.edu.my/49918/1/2014_MARCH_IIJME.pdf

id	iium-49918
recordtype	eprints
spelling	iium-499182018-06-20T06:43:02Z http://irep.iium.edu.my/49918/ Experimental investigation of flow through convergent nozzle and the influence of micro jets on the enlarged duct flow field Ashfaq, Syed Khan, Sher Afghan TL500 Aeronautics Airflow from convergent axi-symmetric nozzle expanded suddenly into circular duct of larger cross-sectional area than that of nozzle exit area were studied experimentally, focusing attention on the wall pressure and the flow development in the enlarged duct. The flow parameters considered in this investigation are the Mach number at the nozzle exit and the nozzle pressure ratio. The geometrical parameters considered are the area ratio between the sudden expansion duct cross-section and the nozzle exit area and the length-to-diameter ratio of the duct. In the present study micro jets were used to investigate the effect of micro jets on the flow field in the suddenly expanded duct. An active control in the form of four micro jets of 1 mm orifice diameter located at 900 intervals intervals along a pitch circle diameter of 1.3 times the nozzle exit diameter in the base region was employed. The Mach numbers of the present studies were M = 0.9, 0.8, and 0.6 and the area ratio (ratio of area of suddenly expanded duct to nozzle exit area) studied was 4.84. The length-to-diameter (i.e. L/D) ratio of the sudden expansion duct was varied from 10 to 1. From the results, it is seen that the flow in the base region is dominated by the waves, it is proved that the correctly expanded flow is dominated by waves; also, it is found that for L/D in the range L/D = 10 and 8 the flow remains oscillatory mostly for all the Mach numbers. However, these oscillations are suppressed gradually either with the decrease in the L/D ratio in the range 3 to 6 or with decrease in the level of inertia level. International Publisher for Advanced Scientific Journals (IPASJ) 2014-03 Article PeerReviewed application/pdf en http://irep.iium.edu.my/49918/1/2014_MARCH_IIJME.pdf Ashfaq, Syed and Khan, Sher Afghan (2014) Experimental investigation of flow through convergent nozzle and the influence of micro jets on the enlarged duct flow field. IPASJ International Journal of Mechanical Engineering (IIJME ), 2 (3). pp. 7-14. ISSN 2321-6441 http://www.ipasj.org/IIJME/Volume2Issue3/IIJME-2014-03-05-042.pdf
repository_type	Digital Repository
institution_category	Local University
institution	International Islamic University Malaysia
building	IIUM Repository
collection	Online Access
language	English
topic	TL500 Aeronautics
spellingShingle	TL500 Aeronautics Ashfaq, Syed Khan, Sher Afghan Experimental investigation of flow through convergent nozzle and the influence of micro jets on the enlarged duct flow field
description	Airflow from convergent axi-symmetric nozzle expanded suddenly into circular duct of larger cross-sectional area than that of nozzle exit area were studied experimentally, focusing attention on the wall pressure and the flow development in the enlarged duct. The flow parameters considered in this investigation are the Mach number at the nozzle exit and the nozzle pressure ratio. The geometrical parameters considered are the area ratio between the sudden expansion duct cross-section and the nozzle exit area and the length-to-diameter ratio of the duct. In the present study micro jets were used to investigate the effect of micro jets on the flow field in the suddenly expanded duct. An active control in the form of four micro jets of 1 mm orifice diameter located at 900 intervals intervals along a pitch circle diameter of 1.3 times the nozzle exit diameter in the base region was employed. The Mach numbers of the present studies were M = 0.9, 0.8, and 0.6 and the area ratio (ratio of area of suddenly expanded duct to nozzle exit area) studied was 4.84. The length-to-diameter (i.e. L/D) ratio of the sudden expansion duct was varied from 10 to 1. From the results, it is seen that the flow in the base region is dominated by the waves, it is proved that the correctly expanded flow is dominated by waves; also, it is found that for L/D in the range L/D = 10 and 8 the flow remains oscillatory mostly for all the Mach numbers. However, these oscillations are suppressed gradually either with the decrease in the L/D ratio in the range 3 to 6 or with decrease in the level of inertia level.
format	Article
author	Ashfaq, Syed Khan, Sher Afghan
author_facet	Ashfaq, Syed Khan, Sher Afghan
author_sort	Ashfaq, Syed
title	Experimental investigation of flow through convergent nozzle and the influence of micro jets on the enlarged duct flow field
title_short	Experimental investigation of flow through convergent nozzle and the influence of micro jets on the enlarged duct flow field
title_full	Experimental investigation of flow through convergent nozzle and the influence of micro jets on the enlarged duct flow field
title_fullStr	Experimental investigation of flow through convergent nozzle and the influence of micro jets on the enlarged duct flow field
title_full_unstemmed	Experimental investigation of flow through convergent nozzle and the influence of micro jets on the enlarged duct flow field
title_sort	experimental investigation of flow through convergent nozzle and the influence of micro jets on the enlarged duct flow field
publisher	International Publisher for Advanced Scientific Journals (IPASJ)
publishDate	2014
url	http://irep.iium.edu.my/49918/ http://irep.iium.edu.my/49918/ http://irep.iium.edu.my/49918/1/2014_MARCH_IIJME.pdf
first_indexed	2023-09-18T21:10:31Z
last_indexed	2023-09-18T21:10:31Z
_version_	1777411221792751616

Experimental investigation of flow through convergent nozzle and the influence of micro jets on the enlarged duct flow field

Similar Items