Pulse combustion studies of propane and natural gas mixtures

The phenomenon of pulse combustion of hydrocarbon-oxygen mixtures was investigated experimentally. An experimental rig that consists of a stainless steel tube with inner diameter of 100mm and length of 1700mm, data acquisition system, ignition control unit and filling system was built in order to me...

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Main Author:	Ujir, Mohd. Haffis
Format:	Thesis
Language:	English
Published:	2009
Subjects:	TJ Mechanical engineering and machinery
Online Access:	http://eprints.utm.my/id/eprint/11361/1/MohdHaffisUjirMFKM2009.pdf
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spelling	my-utm-ep.113612018-06-04T09:53:28Z Pulse combustion studies of propane and natural gas mixtures 2009-07 Ujir, Mohd. Haffis TJ Mechanical engineering and machinery The phenomenon of pulse combustion of hydrocarbon-oxygen mixtures was investigated experimentally. An experimental rig that consists of a stainless steel tube with inner diameter of 100mm and length of 1700mm, data acquisition system, ignition control unit and filling system was built in order to measure the characteristics of pulse combustion such as, pressure, velocity and impulse. Three equivalence ratios of fuel-oxidizer; 0.75, 1 and 1.25 were chosen to investigate the effect of fuel concentration on the pulse combustion wave propagation. It was found that combustion of high fuel concentration mixture propagates as a detonation wave while for low fuel concentration mixture; the combustion wave propagates as deflagration wave. Two types of hydrocarbon fuels were used, i.e, propane and natural gas with 92.7% methane. Results showed that natural gas is not sensitive to detonation propagation compared to propane. It was found that in smooth inner wall tube, combustion wave propagates as a detonation wave if the percent of dilution gas is not more than 35% and it is a function of the equivalence ratio. In order to accelerate the combustion wave into detonation wave within 0.5m of the tube, array of obstacles with identical blockage ratio was placed inside the tube, near to the ignition source. It was observed that the obstacle enhances the transition process within the given length. The ignition source was set at three energy levels, i.e., 25mJ, 5J and 100J. The chosen level of ignition energy did not affect the combustion wave propagation in a smooth inner wall tube but in a rough inner wall tube, it improved the generated impulse force. Impulse measurement using an accelerometer was made to measure the impulse produced by the combustion wave. Generally, the detonation wave produces larger impulse force as compared to deflagration wave. 2009-07 Thesis http://eprints.utm.my/id/eprint/11361/ http://eprints.utm.my/id/eprint/11361/1/MohdHaffisUjirMFKM2009.pdf application/pdf en public masters Universiti Teknologi Malaysia, Faculty of Mechanical Engineering Faculty of Mechanical Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TJ Mechanical engineering and machinery
spellingShingle	TJ Mechanical engineering and machinery Ujir, Mohd. Haffis Pulse combustion studies of propane and natural gas mixtures
description	The phenomenon of pulse combustion of hydrocarbon-oxygen mixtures was investigated experimentally. An experimental rig that consists of a stainless steel tube with inner diameter of 100mm and length of 1700mm, data acquisition system, ignition control unit and filling system was built in order to measure the characteristics of pulse combustion such as, pressure, velocity and impulse. Three equivalence ratios of fuel-oxidizer; 0.75, 1 and 1.25 were chosen to investigate the effect of fuel concentration on the pulse combustion wave propagation. It was found that combustion of high fuel concentration mixture propagates as a detonation wave while for low fuel concentration mixture; the combustion wave propagates as deflagration wave. Two types of hydrocarbon fuels were used, i.e, propane and natural gas with 92.7% methane. Results showed that natural gas is not sensitive to detonation propagation compared to propane. It was found that in smooth inner wall tube, combustion wave propagates as a detonation wave if the percent of dilution gas is not more than 35% and it is a function of the equivalence ratio. In order to accelerate the combustion wave into detonation wave within 0.5m of the tube, array of obstacles with identical blockage ratio was placed inside the tube, near to the ignition source. It was observed that the obstacle enhances the transition process within the given length. The ignition source was set at three energy levels, i.e., 25mJ, 5J and 100J. The chosen level of ignition energy did not affect the combustion wave propagation in a smooth inner wall tube but in a rough inner wall tube, it improved the generated impulse force. Impulse measurement using an accelerometer was made to measure the impulse produced by the combustion wave. Generally, the detonation wave produces larger impulse force as compared to deflagration wave.
format	Thesis
qualification_level	Master's degree
author	Ujir, Mohd. Haffis
author_facet	Ujir, Mohd. Haffis
author_sort	Ujir, Mohd. Haffis
title	Pulse combustion studies of propane and natural gas mixtures
title_short	Pulse combustion studies of propane and natural gas mixtures
title_full	Pulse combustion studies of propane and natural gas mixtures
title_fullStr	Pulse combustion studies of propane and natural gas mixtures
title_full_unstemmed	Pulse combustion studies of propane and natural gas mixtures
title_sort	pulse combustion studies of propane and natural gas mixtures
granting_institution	Universiti Teknologi Malaysia, Faculty of Mechanical Engineering
granting_department	Faculty of Mechanical Engineering
publishDate	2009
url	http://eprints.utm.my/id/eprint/11361/1/MohdHaffisUjirMFKM2009.pdf
_version_	1747814843614756864

Pulse combustion studies of propane and natural gas mixtures

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