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Effect of pilot injection on mixture formation, ignition process and flame development in diesel combustion

Khalid , Amir and Mohamad Jaat, Md Norrizam and Zaman, Izzuddin and Manshoor, Bukhari and Mohd Ali, Mas Fawzi (2013) Effect of pilot injection on mixture formation, ignition process and flame development in diesel combustion. Applied Mechanics and Materials , 390. pp. 327-332.

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Abstract

The alternative combustion strategies with systematic control of mixture formation have provided new opportunities and considerable improvement in the combustion process and response to meet the stringent emissions standards. Purpose of this research is to investigate the influences of pilot injection on the fuel-air premixing especially during ignition delay period. During this period, the interaction between fuel spray and surrounding gas prior to ignition which linked to the improvement of mixture formation, ignition process and initial heat recovery thus predominantly influences the combustion process and exhaust emissions. This study investigate the effects of pilot injection using a rapid compression machine together with the schlieren photography and direct photography methods. The detail behavior of mixture formation during ignition delay period was investigated using the schlieren photography system with a high speed digital video camera. This method can capture spray evaporation, spray interference and mixture formation clearly with real images. Ignition process and flame development were investigated by direct photography method using a light sensitive high-speed color digital video camera. Pilot injection promotes mixture formation during ignition delay period and slower oxidation reaction and thus leads to earlier rise and lower peak heat release rate.

Item Type: Article
Uncontrolled Keywords: mixture formation; spray; rapid compression machine; diesel combustion; ignition process
Subjects: T Technology > TJ Mechanical engineering and machinery > TJ751-805 Miscellaneous motors and engines
Divisions: Faculty of Mechanical and Manufacturing Engineering > Department of Plant and Automotive Engineering
Depositing User: Dr. Amir Khalid
Date Deposited: 15 Mar 2015 08:42
Last Modified: 15 Mar 2015 08:42
URI: http://eprints.uthm.edu.my/id/eprint/4299
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