エタンの着火・燃焼特性に着目した燃焼安定性と耐ノック性を両立させる燃料設計コンセプト

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  • Fuel Design Concept to Improve Both Combustion Stability and Antiknocking Property Focusing on Ignition and Combustion Characteristics of Ethane

説明

<p>To realize a super-leanburn SI engine with a very-high compression ratio, it is required to design a new fuel to provide low ignitability at low temperature for suppressing knocking, but high ignitability at high temperature for suppressing cycle-to-cycle variance. Ethane shows a long ignition delay time at a low temperature close to that of methane, but a short ignition delay time at a high temperature close to that of gasoline, as well as showing a higher laminar burning velocity than those of methane and gasoline. Adding ethane to gasoline can be a fuel design example to improve both combustion stability and antiknocking property In the present study, the antiknocking effect of adding methane with the RON of 130 or ethane with the RON of 112 to a regular gasoline surrogate fuel with the RON of 90 has been investigated. Adding methane or ethane by 35 % or 25 % in heat fraction, respectively, results in the same knock limit SI timing as that of a premium gasoline surrogate fuel with the RON of 100. Namely, the effect of adding ethane is larger than that of adding methane. The antiknocking effect of adding a gaseous fuel to a liquid fuel is controlled not by the RON of the gaseous fuel, but significantly by the OH consuming rate of the gaseous fuel.</p>

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