Abstract
Keywords
Droplet, Diesel engine, Auto-ignition, Micro-explosion, Emulsified fuel
Abstract
The auto-ignition characteristics and combustion behaviors of a single fuel droplet have been investigated experimentally with various droplet sizes and surrounding temperatures. The used fuels were pure n-Decane and emulsified n-Decane with varied water contents whose maximum is 30%.. The imaging technique with high-speed camera has been adopted to measure ignition delay and flame life time. It was also applied to observe micro-explosion behaviors. The increase of droplet size and furnace temperature causes the decrease of the ignition delay time and flame life-time as known in the previous researches. As the water contents increases, the ignition delay time increases and the micro-explosion behaviors are strengthened. The starting timings of micro-explosion and fuel puffing are compared for different droplet sizes and the amount of water contents.