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首页> 外文期刊>Combustion Science and Technology >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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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

机译：研究二甲醚微火焰点火对光学引擎中火焰传播/自燃混合燃烧的燃烧和循环变化特性的影响

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摘要

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.
机译：为了增强燃烧定相控制并减少火焰传播/自燃混合燃烧中的循环变化，提出了一种二甲醚（DME）微火焰点火（MFI）混合燃烧的概念，并在光学引擎中进行了研究。在其主要燃烧阶段可以观察到三阶段放热特性，即第一阶段快速但短暂的DME自燃，然后从DME自燃区的外缘观察到较慢的火焰传播，并且，最后，最终气体自动点火的强烈放热。 DME喷射正时可用于有效控制燃烧阶段和早期放热特性。与火花点火控制的自动点火（SI-CAI）混合燃烧相比，DME MFI混合燃烧在稳定燃烧方面显示出巨大的优势，这是由于较大的点火源面积和更高的火焰形成和传播速度所导致的点火能量。

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