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首页> 外文期刊>JSME International Journal. Series B >A Basic Behavior of CNG DI Combustion in a Spark-Ignited Rapid Compression Machine
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A Basic Behavior of CNG DI Combustion in a Spark-Ignited Rapid Compression Machine

机译：火花点火快速压缩机中CNG DI燃烧的基本行为

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摘要

A basic characteristics of compressed natural gas direct-injection (CNG DI) combustion was studied by using a rapid compression machine. Results show that comparing with homogeneous mixture, CNG DI has short combustion duration, high pressure rise due to combustion, and high rate of heat release, which are considered to come from the charge stratification and the gas flow generated by the fuel injection. CNG DI can realize extremely lean combustion which reaches 0.03 equivalence ratio, φ. Combustion duration, maximum pressure rise due to combustion and combustion efficiency are found to be insensitive to the injection modes. Unburned methane showed almost the same level as that of homogeneous mixture combustion. CO increased steeply with the increase in φ when φ was greater than 0.8 due to the excessive stratification, and NO_x peak value shifted to the region of lower φ. Combustion inefficiency maintains less than 0.08 in the range of φ from 0.1 to 0.9 and increases at very low ? due to bulk quenching and at higher φ due to excessive stratification. The combustion efficiency estimated from combustion products shows good agreement with that of heat release analysis.
机译：利用快速压缩机研究了压缩天然气直喷（CNG DI）燃烧的基本特征。结果表明，与均匀混合物相比，CNG DI的燃烧持续时间短，燃烧引起的压力升高和放热率高，这被认为是由于装料分层和燃料喷射产生的气流所致。 CNG DI可以实现极贫燃烧，达到0.03当量比φ。发现燃烧持续时间，由于燃烧引起的最大压力升高以及燃烧效率对喷射模式不敏感。未燃烧的甲烷显示出与均匀混合物燃烧几乎相同的水平。当φ大于0.8时，由于过度分层，CO随φ的增加而急剧增加，并且NO_x峰值移至较低φ的区域。在φ的0.1到0.9范围内，燃烧效率低下保持在0.08以下，并且在非常低的φ？时增加。归因于整体淬火，以及由于过度分层导致的较高φ。由燃烧产物估算的燃烧效率与放热分析显示出很好的一致性。

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