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Characteristics of Early Flame Development in a Direct-Injection Spark-Ignition CNG Engine Fitted with a Variable Swirl Control Valve

An experimental study was conducted to investigate the effect of the structure of the induction flow on the characteristics of early flames in a lean-stratified and lean-homogeneous charge combustion of compressed natural gas (CNG) fuel in a direct injection (DI) engine at different engine speeds. T...

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Main Authors: Abd Rashid, Abd Aziz, Anbese, Yohannes Tamirat, Hagos, F. Y., Heikal, Morgan R., Firmansyah, F.
Format: Article
Language:English
Published: MDPI AG 2017
Subjects:
TJ Mechanical engineering and machinery
Online Access:http://umpir.ump.edu.my/id/eprint/18581/1/Characteristics%20of%20Early%20Flame%20Development%20in%20a%20Direct-Injection%20Spark-Ignition%20CNG%20Engine%20Fitted%20with%20a%20Variable%20Swirl%20Control%20Valve.pdf
http://umpir.ump.edu.my/id/eprint/18581/
http://dx.doi.org/10.3390/en10070964
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spelling my.ump.umpir.185812018-03-07T00:42:21Z http://umpir.ump.edu.my/id/eprint/18581/ Characteristics of Early Flame Development in a Direct-Injection Spark-Ignition CNG Engine Fitted with a Variable Swirl Control Valve Abd Rashid, Abd Aziz Anbese, Yohannes Tamirat Hagos, F. Y. Heikal, Morgan R. Firmansyah, F. TJ Mechanical engineering and machinery An experimental study was conducted to investigate the effect of the structure of the induction flow on the characteristics of early flames in a lean-stratified and lean-homogeneous charge combustion of compressed natural gas (CNG) fuel in a direct injection (DI) engine at different engine speeds. The engine speed was varied at 1500 rpm, 1800 rpm and 2100 rpm, and the ignition timing was set at a 38.5° crank angle (CA) after top dead center (TDC) for all conditions. The engine was operated in a partial-load mode and a homogeneous air/fuel charge was achieved by injecting the fuel early (before the intake valve closure), while late injection during the compression stroke was used to produce a stratified charge. Different induction flow structures were obtained by adjusting the swirl control valves (SCV). Using an endoscopic intensified CCD (ICCD) camera, flame images were captured and analyzed. Code was developed to analyze the level of distortion of the flame and its wrinkledness, displacement and position relative to the spark center, as well as the flame growth rate. The results showed a higher flame growth rate with the flame kernel in the homogeneous charge, compared to the stratified combustion case. In the stratified charge combustion scenario, the 10° SCV closure (medium-tumble) resulted in a higher early flame growth rate, whereas a homogeneous charge combustion (characterized by strong swirl) resulted in the highest rate of flame growth. MDPI AG 2017 Article PeerReviewed application/pdf en http://umpir.ump.edu.my/id/eprint/18581/1/Characteristics%20of%20Early%20Flame%20Development%20in%20a%20Direct-Injection%20Spark-Ignition%20CNG%20Engine%20Fitted%20with%20a%20Variable%20Swirl%20Control%20Valve.pdf Abd Rashid, Abd Aziz and Anbese, Yohannes Tamirat and Hagos, F. Y. and Heikal, Morgan R. and Firmansyah, F. (2017) Characteristics of Early Flame Development in a Direct-Injection Spark-Ignition CNG Engine Fitted with a Variable Swirl Control Valve. Energies, 10 (7). pp. 1-16. ISSN 1996-1073 http://dx.doi.org/10.3390/en10070964 doi: 10.3390/en10070964
institution Universiti Malaysia Pahang
building UMP Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaysia Pahang
content_source UMP Institutional Repository
url_provider http://umpir.ump.edu.my/
language English
topic TJ Mechanical engineering and machinery
spellingShingle TJ Mechanical engineering and machinery
Abd Rashid, Abd Aziz
Anbese, Yohannes Tamirat
Hagos, F. Y.
Heikal, Morgan R.
Firmansyah, F.
Characteristics of Early Flame Development in a Direct-Injection Spark-Ignition CNG Engine Fitted with a Variable Swirl Control Valve
description An experimental study was conducted to investigate the effect of the structure of the induction flow on the characteristics of early flames in a lean-stratified and lean-homogeneous charge combustion of compressed natural gas (CNG) fuel in a direct injection (DI) engine at different engine speeds. The engine speed was varied at 1500 rpm, 1800 rpm and 2100 rpm, and the ignition timing was set at a 38.5° crank angle (CA) after top dead center (TDC) for all conditions. The engine was operated in a partial-load mode and a homogeneous air/fuel charge was achieved by injecting the fuel early (before the intake valve closure), while late injection during the compression stroke was used to produce a stratified charge. Different induction flow structures were obtained by adjusting the swirl control valves (SCV). Using an endoscopic intensified CCD (ICCD) camera, flame images were captured and analyzed. Code was developed to analyze the level of distortion of the flame and its wrinkledness, displacement and position relative to the spark center, as well as the flame growth rate. The results showed a higher flame growth rate with the flame kernel in the homogeneous charge, compared to the stratified combustion case. In the stratified charge combustion scenario, the 10° SCV closure (medium-tumble) resulted in a higher early flame growth rate, whereas a homogeneous charge combustion (characterized by strong swirl) resulted in the highest rate of flame growth.
format Article
author Abd Rashid, Abd Aziz
Anbese, Yohannes Tamirat
Hagos, F. Y.
Heikal, Morgan R.
Firmansyah, F.
author_facet Abd Rashid, Abd Aziz
Anbese, Yohannes Tamirat
Hagos, F. Y.
Heikal, Morgan R.
Firmansyah, F.
author_sort Abd Rashid, Abd Aziz
title Characteristics of Early Flame Development in a Direct-Injection Spark-Ignition CNG Engine Fitted with a Variable Swirl Control Valve
title_short Characteristics of Early Flame Development in a Direct-Injection Spark-Ignition CNG Engine Fitted with a Variable Swirl Control Valve
title_full Characteristics of Early Flame Development in a Direct-Injection Spark-Ignition CNG Engine Fitted with a Variable Swirl Control Valve
title_fullStr Characteristics of Early Flame Development in a Direct-Injection Spark-Ignition CNG Engine Fitted with a Variable Swirl Control Valve
title_full_unstemmed Characteristics of Early Flame Development in a Direct-Injection Spark-Ignition CNG Engine Fitted with a Variable Swirl Control Valve
title_sort characteristics of early flame development in a direct-injection spark-ignition cng engine fitted with a variable swirl control valve
publisher MDPI AG
publishDate 2017
url http://umpir.ump.edu.my/id/eprint/18581/1/Characteristics%20of%20Early%20Flame%20Development%20in%20a%20Direct-Injection%20Spark-Ignition%20CNG%20Engine%20Fitted%20with%20a%20Variable%20Swirl%20Control%20Valve.pdf
http://umpir.ump.edu.my/id/eprint/18581/
http://dx.doi.org/10.3390/en10070964
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score 13.211869

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