Effects of multi-circular jet plates on the spray and flame characteristics of internal mixing air-assisted atomizer

The mixing of fuel and air plays a major role in the spray and flame behaviour, hence, affects the combustion performance and emissions of the internal mixing air-assisted atomizers. This research aims to determine the effects of multi-circular jet (MCJ) plates on the spray behavior and flame charac...

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Main Author:	Amirnordin, Shahrin Hisham
Format:	Thesis
Language:	English English English
Published:	2020
Subjects:	T Technology (General)
Online Access:	http://eprints.uthm.edu.my/10803/1/24p%20SHAHRIN%20HISHAM%20AMIRNORDIN.pdf http://eprints.uthm.edu.my/10803/2/SHAHRIN%20HISHAM%20AMIRNORDIN%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/10803/3/SHAHRIN%20HISHAM%20AMIRNORDIN%20WATERMARK.pdf
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spelling	my-uthm-ep.108032024-05-13T06:56:06Z Effects of multi-circular jet plates on the spray and flame characteristics of internal mixing air-assisted atomizer 2020-07 Amirnordin, Shahrin Hisham T Technology (General) The mixing of fuel and air plays a major role in the spray and flame behaviour, hence, affects the combustion performance and emissions of the internal mixing air-assisted atomizers. This research aims to determine the effects of multi-circular jet (MCJ) plates on the spray behavior and flame characteristics of air assisted atomizers. The MCJ plates provide the primary air entrance into the mixing chamber. The plates are represented by P1, P2, and P3 characterized by the difference in the open area ratio at 17.8, 18.4 and 18.9 respectively. Additionally, P1, P4, and P5 are represented by the jet-hole angles at 0o, 30o and 45o. In the experiments, the spray and flame images of all plates are captured at equivalence ratios of 0.8 to 1.2 using a Digital Single Lens Reflect camera. The flame temperatures are measured using the infra-red imaging technique while the emissions, burning chamber and stack temperature are also recorded using an emission gas analyzer and K-type thermocouples respectively. Then the computational work is conducted by using ANSYS Fluent to visualize the impact of plate geometry on the internal fluid flow and spray structure. Further analysis using both experiments and simulations have been carried out in order to compare between the P5 configuration and swirl. Results show that a decrease in open area ratio and jet-hole angle increases the flame temperature up to 11.4% and 13.8% respectively. The inclined jet-hole also increases the velocity up to 47.7% and turbulence kinetic energy up to 62.4% in the mixing chamber. In comparison between MCJ plate (P5) and swirl, P5 produces 33.8% lower backpressure but produces higher flame temperature at 4.3%. The result indicates that the MCJ plates are more effective in controlling the spray and flame characteristics of the atomizer. The outcome of this work provides a deeper understanding on the relations of geometry and fuel-air mixing to the characteristics of the internal mixing air-assisted atomizer which will lead to the improvement of burner systems in the future. 2020-07 Thesis http://eprints.uthm.edu.my/10803/ http://eprints.uthm.edu.my/10803/1/24p%20SHAHRIN%20HISHAM%20AMIRNORDIN.pdf text en public http://eprints.uthm.edu.my/10803/2/SHAHRIN%20HISHAM%20AMIRNORDIN%20COPYRIGHT%20DECLARATION.pdf text en staffonly http://eprints.uthm.edu.my/10803/3/SHAHRIN%20HISHAM%20AMIRNORDIN%20WATERMARK.pdf text en validuser phd doctoral Universiti Tun Hussein Onn Malaysia Fakulti Kejuruteraan Mekanikal dan Pembuatan
institution	Universiti Tun Hussein Onn Malaysia
collection	UTHM Institutional Repository
language	English English English
topic	T Technology (General)
spellingShingle	T Technology (General) Amirnordin, Shahrin Hisham Effects of multi-circular jet plates on the spray and flame characteristics of internal mixing air-assisted atomizer
description	The mixing of fuel and air plays a major role in the spray and flame behaviour, hence, affects the combustion performance and emissions of the internal mixing air-assisted atomizers. This research aims to determine the effects of multi-circular jet (MCJ) plates on the spray behavior and flame characteristics of air assisted atomizers. The MCJ plates provide the primary air entrance into the mixing chamber. The plates are represented by P1, P2, and P3 characterized by the difference in the open area ratio at 17.8, 18.4 and 18.9 respectively. Additionally, P1, P4, and P5 are represented by the jet-hole angles at 0o, 30o and 45o. In the experiments, the spray and flame images of all plates are captured at equivalence ratios of 0.8 to 1.2 using a Digital Single Lens Reflect camera. The flame temperatures are measured using the infra-red imaging technique while the emissions, burning chamber and stack temperature are also recorded using an emission gas analyzer and K-type thermocouples respectively. Then the computational work is conducted by using ANSYS Fluent to visualize the impact of plate geometry on the internal fluid flow and spray structure. Further analysis using both experiments and simulations have been carried out in order to compare between the P5 configuration and swirl. Results show that a decrease in open area ratio and jet-hole angle increases the flame temperature up to 11.4% and 13.8% respectively. The inclined jet-hole also increases the velocity up to 47.7% and turbulence kinetic energy up to 62.4% in the mixing chamber. In comparison between MCJ plate (P5) and swirl, P5 produces 33.8% lower backpressure but produces higher flame temperature at 4.3%. The result indicates that the MCJ plates are more effective in controlling the spray and flame characteristics of the atomizer. The outcome of this work provides a deeper understanding on the relations of geometry and fuel-air mixing to the characteristics of the internal mixing air-assisted atomizer which will lead to the improvement of burner systems in the future.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Amirnordin, Shahrin Hisham
author_facet	Amirnordin, Shahrin Hisham
author_sort	Amirnordin, Shahrin Hisham
title	Effects of multi-circular jet plates on the spray and flame characteristics of internal mixing air-assisted atomizer
title_short	Effects of multi-circular jet plates on the spray and flame characteristics of internal mixing air-assisted atomizer
title_full	Effects of multi-circular jet plates on the spray and flame characteristics of internal mixing air-assisted atomizer
title_fullStr	Effects of multi-circular jet plates on the spray and flame characteristics of internal mixing air-assisted atomizer
title_full_unstemmed	Effects of multi-circular jet plates on the spray and flame characteristics of internal mixing air-assisted atomizer
title_sort	effects of multi-circular jet plates on the spray and flame characteristics of internal mixing air-assisted atomizer
granting_institution	Universiti Tun Hussein Onn Malaysia
granting_department	Fakulti Kejuruteraan Mekanikal dan Pembuatan
publishDate	2020
url	http://eprints.uthm.edu.my/10803/1/24p%20SHAHRIN%20HISHAM%20AMIRNORDIN.pdf http://eprints.uthm.edu.my/10803/2/SHAHRIN%20HISHAM%20AMIRNORDIN%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/10803/3/SHAHRIN%20HISHAM%20AMIRNORDIN%20WATERMARK.pdf
_version_	1804890118067060736

Effects of multi-circular jet plates on the spray and flame characteristics of internal mixing air-assisted atomizer

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