A Fundamental Study of Ignition Characteristics in Diesel Spray with Various Mixed Fuels

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  • 各種混合燃料を用いたディーゼル噴霧の着火特性に関する基礎的研究(エンジンと新燃料(2),エンジンと新燃料)

Abstract

We have proposed a conceptual research with fuel approach to develop understanding for potential use of fuels in terms of further improvement of thermal efficiency and exhaust emissions because they provide the significant effect on diesel engine performance. As a result, we could conclude that mixing of high volatile fuel into low volatile fuel has a possibility to control the spray and combustion processes. However, for instance, high volatility component has low ignitability, which leads to longer ignition delay, with regard to straight-chain alkane. Thus, understanding the ignition behavior of mixed fuel consisting of high and low ignitability fuels is of particular importance as ignition delay dominates the combustion process related to exhaust emissions and thermal efficiency. In this paper, an ignition experiment was conducted to investigate the ignition characteristics of mixed fuel. The experiment includes the measurement of pressure waveform and CH chemiluminescence, which indicates the onset of heat release, in order to discuss about ignition processes of mixed fuel. The results provided conclusions that the ignition of mixed fuel was initiated by high ignitability fuel and affected by volatility of high ignitability fuel.

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