Analysis of diesel combustion using a rapid compression machine and optical visualization technique

Khalid , Amir and Yoshiyuki, Kidoguchi (2010) Analysis of diesel combustion using a rapid compression machine and optical visualization technique. In: 2nd International On-Board Symposium : Human Health, Energy and Environment, Japan.

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Abstract

In diesel engines, combustion progresses by nature heterogeneous. Diesel spray spontaneous ignites within short period after fuel injection. During this period, mixture formation plays as a key element on burning process that strongly affects the exhaust emissions such as nitrogen oxide(NOx) and Particulate Matter(PM). The reductions of emissions can be achieved with improvement throughout the mixing of fuel and air phenomena. High ambient density resulting from the increasing of boost pressure is anticipated to influence the mixture formation during ignition delay period and burning process. The diesel combustion was simulated with the Rapid Compression Machine(RCM), the mixture formation and combustion images were captured by the high speed camera. Analysis of combustion characteristics and observations of optical visualization of images reveal that the mixture formation exhibit influences to the ignition process and flame development.Increasing ambient density shortens ignition delay. High heat capacity at spray boundary resulting from high density mitigates temperature drop of ambient gas, and promotes formation of combustible mixture. However, this condition tends to produce high intensity bright flame due to locally rich combustion and lengthen combustion duration. It is important to improve mixture formation so as to fully consume oxygen under high ambient density condition.

Item Type:Conference or Workshop Item (Paper)
Uncontrolled Keywords:diesel engine; combustion; Rapid Compression Machine; mixture formation; flame patter; boost pressure
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
ID Code:2200
Deposited By:Dr. Amir Khalid
Deposited On:03 Jan 2012 08:57
Last Modified:03 Jan 2012 08:57

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