Study of effect of flow parameters on base pressure in a suddenly expanded duct at supersonic mach number regimes using CFD and design of experiments

Effectiveness of active control of micro jets has been examined by conducting experiments through an abruptly expanded axi-symmetric duct in a view to control base pressure. For this purpose, 1mm orifice diameter micro jets have been deployed at an interval of 900 along the exit diameter of the no...

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Main Authors:	Quadros, Jaimon Dennis, Khan, Sher Afghan, A. J., Antony
Format:	Article
Language:	English English English
Published:	The Physics Society of Iran with the collaboration of Isfahan University of Technology (IUT) 2018
Subjects:	TL780 Rockets
Online Access:	http://irep.iium.edu.my/62182/ http://irep.iium.edu.my/62182/ http://irep.iium.edu.my/62182/ http://irep.iium.edu.my/62182/1/62182__Study%20of%20effect%20of%20flow%20parameters%20on%20base%20pressure.pdf http://irep.iium.edu.my/62182/2/62182__Study%20of%20effect%20of%20flow%20parameters%20on%20base%20pressure_SCOPUS.pdf http://irep.iium.edu.my/62182/3/62182__Study%20of%20effect%20of%20flow%20parameters%20on%20base%20pressure_WOS.pdf

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spelling	iium-621822018-07-04T03:15:43Z http://irep.iium.edu.my/62182/ Study of effect of flow parameters on base pressure in a suddenly expanded duct at supersonic mach number regimes using CFD and design of experiments Quadros, Jaimon Dennis Khan, Sher Afghan A. J., Antony TL780 Rockets Effectiveness of active control of micro jets has been examined by conducting experiments through an abruptly expanded axi-symmetric duct in a view to control base pressure. For this purpose, 1mm orifice diameter micro jets have been deployed at an interval of 900 along the exit diameter of the nozzle. The experiments have been conducted by considering three flow parameters at three levels. Mach number (M), length to diameter (L/D) ratio and area ratio (AR) are the three parameters used to conduct and analyze the flow experiments. Base pressure is considered to be the response variable. The experimentation has been carried out for two cases, i) without active control; ii) with active control. An L9 orthogonal array has been implemented to plan the experiments. It is observed that the control becomes effective for lower area ratios when compared to the higher ones. In addition to this, at high area ratios suction at the base decreases and hence base pressure continuous to diminish with increasing L/D until it reaches a value of L/D=6. The obtained experimental results are subjected to multiple linear regression analysis and Analysis of variance (ANOVA). The performances of the two linear regression models were tested for their prediction accuracy with the help of 15 random test cases. It is observed that, both linear regression models for base pressure without and with control are statistically adequate and capable of making accurate predictions. Furthermore, this work also concludes that, Mach number is the most significant factor affecting base pressure followed by area ratio and L/D ratio for both cases of experimentation. The obtained experimental results are further validated by CFD analysis and are found to be in good concurrence with each other. The Physics Society of Iran with the collaboration of Isfahan University of Technology (IUT) 2018-02-16 Article PeerReviewed application/pdf en http://irep.iium.edu.my/62182/1/62182__Study%20of%20effect%20of%20flow%20parameters%20on%20base%20pressure.pdf application/pdf en http://irep.iium.edu.my/62182/2/62182__Study%20of%20effect%20of%20flow%20parameters%20on%20base%20pressure_SCOPUS.pdf application/pdf en http://irep.iium.edu.my/62182/3/62182__Study%20of%20effect%20of%20flow%20parameters%20on%20base%20pressure_WOS.pdf Quadros, Jaimon Dennis and Khan, Sher Afghan and A. J., Antony (2018) Study of effect of flow parameters on base pressure in a suddenly expanded duct at supersonic mach number regimes using CFD and design of experiments. Journal of Applied Fluid Mechanics, 11 (2). pp. 483-496. ISSN 1735-3572 E-ISSN 1735-3645 http://jafmonline.net/web/guest/home?p_p_id=JournalArchive_WAR_JournalArchive_INSTANCE_nvhn&p_p_action=0&p_p_state=maximized&p_p_mode=view&p_p_col_id=column-2&p_p_col_pos=3&p_p_col_count=6&_JournalArchive_WAR_JournalArchive_INSTANCE_nvhn_form_page=main_form&selectedVolumeId=74&selectedIssueId=247 10.18869/acadpub.jafm.73.245.27502
repository_type	Digital Repository
institution_category	Local University
institution	International Islamic University Malaysia
building	IIUM Repository
collection	Online Access
language	English English English
topic	TL780 Rockets
spellingShingle	TL780 Rockets Quadros, Jaimon Dennis Khan, Sher Afghan A. J., Antony Study of effect of flow parameters on base pressure in a suddenly expanded duct at supersonic mach number regimes using CFD and design of experiments
description	Effectiveness of active control of micro jets has been examined by conducting experiments through an abruptly expanded axi-symmetric duct in a view to control base pressure. For this purpose, 1mm orifice diameter micro jets have been deployed at an interval of 900 along the exit diameter of the nozzle. The experiments have been conducted by considering three flow parameters at three levels. Mach number (M), length to diameter (L/D) ratio and area ratio (AR) are the three parameters used to conduct and analyze the flow experiments. Base pressure is considered to be the response variable. The experimentation has been carried out for two cases, i) without active control; ii) with active control. An L9 orthogonal array has been implemented to plan the experiments. It is observed that the control becomes effective for lower area ratios when compared to the higher ones. In addition to this, at high area ratios suction at the base decreases and hence base pressure continuous to diminish with increasing L/D until it reaches a value of L/D=6. The obtained experimental results are subjected to multiple linear regression analysis and Analysis of variance (ANOVA). The performances of the two linear regression models were tested for their prediction accuracy with the help of 15 random test cases. It is observed that, both linear regression models for base pressure without and with control are statistically adequate and capable of making accurate predictions. Furthermore, this work also concludes that, Mach number is the most significant factor affecting base pressure followed by area ratio and L/D ratio for both cases of experimentation. The obtained experimental results are further validated by CFD analysis and are found to be in good concurrence with each other.
format	Article
author	Quadros, Jaimon Dennis Khan, Sher Afghan A. J., Antony
author_facet	Quadros, Jaimon Dennis Khan, Sher Afghan A. J., Antony
author_sort	Quadros, Jaimon Dennis
title	Study of effect of flow parameters on base pressure in a suddenly expanded duct at supersonic mach number regimes using CFD and design of experiments
title_short	Study of effect of flow parameters on base pressure in a suddenly expanded duct at supersonic mach number regimes using CFD and design of experiments
title_full	Study of effect of flow parameters on base pressure in a suddenly expanded duct at supersonic mach number regimes using CFD and design of experiments
title_fullStr	Study of effect of flow parameters on base pressure in a suddenly expanded duct at supersonic mach number regimes using CFD and design of experiments
title_full_unstemmed	Study of effect of flow parameters on base pressure in a suddenly expanded duct at supersonic mach number regimes using CFD and design of experiments
title_sort	study of effect of flow parameters on base pressure in a suddenly expanded duct at supersonic mach number regimes using cfd and design of experiments
publisher	The Physics Society of Iran with the collaboration of Isfahan University of Technology (IUT)
publishDate	2018
url	http://irep.iium.edu.my/62182/ http://irep.iium.edu.my/62182/ http://irep.iium.edu.my/62182/ http://irep.iium.edu.my/62182/1/62182__Study%20of%20effect%20of%20flow%20parameters%20on%20base%20pressure.pdf http://irep.iium.edu.my/62182/2/62182__Study%20of%20effect%20of%20flow%20parameters%20on%20base%20pressure_SCOPUS.pdf http://irep.iium.edu.my/62182/3/62182__Study%20of%20effect%20of%20flow%20parameters%20on%20base%20pressure_WOS.pdf
first_indexed	2023-09-18T21:28:10Z
last_indexed	2023-09-18T21:28:10Z
_version_	1777412331473469440

Study of effect of flow parameters on base pressure in a suddenly expanded duct at supersonic mach number regimes using CFD and design of experiments

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