Premixed flame acceleration in straight and bend close pipe

There were many studies on premixed flame propagation in tubes, including open tubes and enclosures. Yet, no sufficient data obtained for explosion properties in medium scale piping system to assist engineers or practitioners in determining the potential hazard posed due to explosion. In this wor...

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Main Author:	Miss Hasimawaty, Mat Kiah
Format:	Thesis
Language:	English
Published:	2013
Subjects:	TJ Mechanical engineering and machinery
Online Access:	http://umpir.ump.edu.my/id/eprint/9465/1/CD8264.pdf
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id	my-ump-ir.9465
record_format	uketd_dc
spelling	my-ump-ir.94652021-08-19T05:22:59Z Premixed flame acceleration in straight and bend close pipe 2013-09 Miss Hasimawaty, Mat Kiah TJ Mechanical engineering and machinery There were many studies on premixed flame propagation in tubes, including open tubes and enclosures. Yet, no sufficient data obtained for explosion properties in medium scale piping system to assist engineers or practitioners in determining the potential hazard posed due to explosion. In this work, an experimental study had been carried out to investigate the explosion properties in a pipeline using two pipe configurations, i.e. straight and 90 degree bend. A horizontal steel pipe, with 2 m long (L) and 0.1 m diameter (D), giving L/D ratio of 20 was used in the range of equivalence ratios (Ф) from 0.5 to 1.8. The 90 degree bend pipe had a bend radius of 0.1 m with added a further 1 m to the length of the pipe (based on the centerline length of the segment). Natural gas/pure oxygen mixture was prepared using partial pressure method and a homogeneous composition was achieved by circulating the mixture using a solid ball which was placed in the mixing cell. It was shown that stoichiometric mixtures gave the highest flame speed measurement, both on straight and bend pipes. Stoichiometric concentration (Ф = 1.0) gave significant maximum overpressure of 5.5 bars for bend pipe, compared to 2.0 bars on straight pipe explosion test; approximately 3 times higher. This was due to bending part that acted like obstacles. This mechanism could induce and created more turbulence, initiated the combustion of unburned pocket at the corner region, causing high mass burning rate and hence, increased the flame speed. It was also shown that the flame speed was enhanced by factor of 3 for explosion in bend pipe compared to straight pipe. It can be concluded that the bend can create greater turbulence effect compared to straight pipe configuration and applying appropriate safety devices before the area of the bends is recommended as one of the effective methods to prevent the explosion from happen. 2013-09 Thesis http://umpir.ump.edu.my/id/eprint/9465/ http://umpir.ump.edu.my/id/eprint/9465/1/CD8264.pdf application/pdf en public masters Universiti Teknologi Malaysia Faculty of Petroleum and Renewable Energy Engineering
institution	Universiti Malaysia Pahang Al-Sultan Abdullah
collection	UMPSA Institutional Repository
language	English
topic	TJ Mechanical engineering and machinery
spellingShingle	TJ Mechanical engineering and machinery Miss Hasimawaty, Mat Kiah Premixed flame acceleration in straight and bend close pipe
description	There were many studies on premixed flame propagation in tubes, including open tubes and enclosures. Yet, no sufficient data obtained for explosion properties in medium scale piping system to assist engineers or practitioners in determining the potential hazard posed due to explosion. In this work, an experimental study had been carried out to investigate the explosion properties in a pipeline using two pipe configurations, i.e. straight and 90 degree bend. A horizontal steel pipe, with 2 m long (L) and 0.1 m diameter (D), giving L/D ratio of 20 was used in the range of equivalence ratios (Ф) from 0.5 to 1.8. The 90 degree bend pipe had a bend radius of 0.1 m with added a further 1 m to the length of the pipe (based on the centerline length of the segment). Natural gas/pure oxygen mixture was prepared using partial pressure method and a homogeneous composition was achieved by circulating the mixture using a solid ball which was placed in the mixing cell. It was shown that stoichiometric mixtures gave the highest flame speed measurement, both on straight and bend pipes. Stoichiometric concentration (Ф = 1.0) gave significant maximum overpressure of 5.5 bars for bend pipe, compared to 2.0 bars on straight pipe explosion test; approximately 3 times higher. This was due to bending part that acted like obstacles. This mechanism could induce and created more turbulence, initiated the combustion of unburned pocket at the corner region, causing high mass burning rate and hence, increased the flame speed. It was also shown that the flame speed was enhanced by factor of 3 for explosion in bend pipe compared to straight pipe. It can be concluded that the bend can create greater turbulence effect compared to straight pipe configuration and applying appropriate safety devices before the area of the bends is recommended as one of the effective methods to prevent the explosion from happen.
format	Thesis
qualification_level	Master's degree
author	Miss Hasimawaty, Mat Kiah
author_facet	Miss Hasimawaty, Mat Kiah
author_sort	Miss Hasimawaty, Mat Kiah
title	Premixed flame acceleration in straight and bend close pipe
title_short	Premixed flame acceleration in straight and bend close pipe
title_full	Premixed flame acceleration in straight and bend close pipe
title_fullStr	Premixed flame acceleration in straight and bend close pipe
title_full_unstemmed	Premixed flame acceleration in straight and bend close pipe
title_sort	premixed flame acceleration in straight and bend close pipe
granting_institution	Universiti Teknologi Malaysia
granting_department	Faculty of Petroleum and Renewable Energy Engineering
publishDate	2013
url	http://umpir.ump.edu.my/id/eprint/9465/1/CD8264.pdf
_version_	1783731954302058496

Premixed flame acceleration in straight and bend close pipe

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