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Experimental investigation in combustion characteristics of ethanol-gasoline blends for stratified charge engine

Experimental investigation in combustion characteristics of ...

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作者： Charoenphonphanich, Chinda Ornman, Piyaboot Karin, Preechar Kosaka, Hidenori Chollacoop, Nuwong Mechanical Engineering Faculty of Engineering King Mongkut's Institute of Technology Ladkrabang Charongkrung 1Rd. Ladkrabang Bangkok 10520 Thailand TAIST-TokyoTech Automotive Engineering Program Japan International College King Mongkut's Institute of Technology Ladkrabang Thailand Tokyo Institute of Technology Japan Thailand

The increasing of global energy demand and stringent pollution regulations have promoted research on alternative fuels. In Thailand, ethanol, can be produced from many sources of national agriculture products as renewable fuel, which was strongly promoted by government due to its many merits for use in transportation field. In this study, combustion characteristics of ethanol-gasoline blend (20%, 85%, and 100%) as well as pure gasoline (E0) were investigated by using a swirl-generated constant volume combustion chamber. Flame propagations of different fuel blends were observed by high speed Schlieren photography technique while pressure history data were recorded for detailed combustion analysis. Combustion behavior, combustion duration and rate of pressure rise of all tested fuels were investigated in various swirl intensities and equivalence ratios. In addition, effect of swirl intensities and ethanol concentration on lean misfire limit were also discussed. The results showed that the high concentration of ethanol blend with the high swirl intensity can significantly extended lean misfire limit while lowering combustion variations. Furthermore, combustion duration can be accelerated by increasing the percentage of ethanol in fuel blend. Through this study, a better understanding of stratified charge combustion fuelled with ethanol/gasoline blends can be achieved. Copyright © SAE Japan and Copyright © 2011 SAE International.

关键词： Ethanol

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Low temperature starting techniques for ethanol engine without secondary fuel tank

Low temperature starting techniques for ethanol engine witho...

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作者： Charoenphonphanich, Chinda Imerb, Wittawat Karin, Preechar Chollacoop, Nuwong Hanamura, Katsunori Department of Mechanical Engineering Faculty of Engineering King Mongkut's Institute of Technology Ladkrabang Thailand TAIST TokyoTech Automotive Engineering Program King Mongkut's Institute of Technology Ladkrabang Thailand International College King Mongkut's Institute of Technology Ladkrabang Thailand National Science and Technology Development Agency Thailand Tokyo Institute of Technology Japan

The present study aims to investigate the parameters affecting cold start characteristics of ethanol at low temperature, and suggest a solution to avoid cold starting problem without the installation of second fuel tank. The testing engine is a 125 CC. volume displacement, single cylinder four strokes SI engine with fuel injection and ignition timing system controlled by ECU (electronic control unit). The cold starting performance tests were extensively conducted with different percentage of ethanol blends, surrounding temperatures, heating inside combustion chamber, heater injector, pre-cranking without fuel injection, and amount of fuel injection. From the experimental results, when using ethanol fuel in conventional engine, the problem of cold starting was observed at surrounding temperature lower than 20°C for ethanol. Increasing of injection duration can lower the possible cold start temperature of neat ethanol. Glow plug and pre-cranking heating methods can help the engine start at much lower temperature. The combination of many techniques can make the ethanol engine start at the temperature as low as 3.5°C. These findings offer solutions to the cold start problem in engine fueled with neat ethanol fuel in Thailand. Copyright © SAE Japan and Copyright © 2011 SAE International.

关键词： Ethanol

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