Investigations into the Influence of Dimethyl Ether Micro Flame Ignition on the Combustion and Cyclic Variation Characteristics of Flame Propagation/Auto-Ignition Hybrid Combustion in an Optical Engine

Investigations into the Influence of Dimethyl Ether Micro Flame Ignition on the Combustion and Cyclic Variation Characteristics of Flame Propagation/Auto-Ignition Hybrid Combustion in an Optical Engine
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二甲醚微火焰点火对光学发动机火焰传播/自点火混合燃烧燃烧及循环变化特性的影响研究

DOI:
10.1080/00102202.2016.1223060
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发表时间:
2017-03
影响因子:
1.9
通讯作者:
Zhao Hua
Zhao Hua
中科院分区:
工程技术4区
文献类型:
--
作者:
Xie Hui;Xu Kang;Chen Tao;Zhao Hua

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摘要为了提高火焰传播/自燃混合燃烧的相位控制能力,降低循环波动,提出了二甲醚(DME)微火焰点火(MFI)混合燃烧的概念,并在光学发动机上进行了研究。其主要燃烧阶段的放热特征表现为三个阶段:第一阶段DME自燃迅速但时间较短,第二阶段DME自燃区外缘火焰传播较慢,第三阶段尾气自燃放热强烈。二甲醚喷射定时可以有效地控制燃烧相位和早期放热特性。与火花点火控制自动点火(SI-CAI)混合燃烧相比,DME MFI混合燃烧由于点火源面积大、点火能量高,火焰形成和传播速度快,在稳燃方面具有明显优势。
ABSTRACT In order to enhance combustion phasing control and reduce cyclic variations in flame propagation/auto-ignition hybrid combustion, a concept of dimethyl ether (DME) micro flame ignition (MFI) hybrid combustion is proposed and studied in an optical engine. Three-stage heat release characteristics can be observed in its main combustion period, which are the rapid but short DME auto-ignition in the first stage, followed by slower flame propagation observed from the outer rim of the DME auto-ignition zone, and, at last, the intense heat release of the end-gas auto-ignition. The DME injection timing can be used to effectively control the combustion phasing and the early stage heat release characteristics. Compared to the spark ignition-controlled auto-ignition (SI-CAI) hybrid combustion, the DME MFI hybrid combustion shows great benefits in stabilizing combustion, which is caused by the accelerated flame formation and propagation speed due to larger area of ignition source and higher ignition energy.
DOI: 10.1177/0954407014565800
发表时间: 2015-01
期刊: Proceedings of the Institution of Mechanical Engineers - Part D: Journal of Automobile Engineering
影响因子: --
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