权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Ignition Control on Rapidly Compressed Dimethylether Mixtures with Reaction Suppression Effect of Methanol

甲醇反应抑制作用对快速压缩二甲醚混合物的点火控制

基本信息

批准号：
14550171
负责人：
OGAWA Hideyuki
金额：
$ 2.24万
依托单位：
HOKKAIDO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14550171/
关键词：
Methanol Compression Ignition Premixed Combustion Internal Combustion Engine Chemical Kinetics Ignition Combustion NOx

项目摘要

Direct injection of an ignition suppressor was attempted to control the ignition timing, suppression of rapid combustion, and expansion of the operating range in an HCCI engine with induced DME. The effect of the ignition suppressors was analyzed with a chemical kinetics, which simulated the engine-like transient gas conditions as well as with experiments in an HCCI engine. The reaction suppressors reduced the low-temperature oxidation reactions and delayed the start of high-temperature oxidation reactions. The chemical kinetic analysis showed a reduction of OH, O, and H radical concentrations in the premixed charge when injecting the suppressors without lowering the temperature. Among the ignition suppressors tested here alcohols had a greater effect for the radical reduction resulting in stronger ignition suppression than water, hydrogen and methane, and methanol had the strongest effects among alcohols. While water had a greater effect on lowering the temperature, methanol had a much stronger chemical effect on the radical reduction. The reduction of low-temperature oxidation suppressed the temperature increase after the reaction and this temperature drop delayed the start of high-temperature oxidation. There was no effect when suppressor injection timing was set after the appearance of the low oxidation, and the reaction suppression effect increased with advanced suppressor injection timings. The control of ignition timing, suppression of rapid combustion, and expansion of the operating range to loads comparable to ordinary diesel operation were achieved with direct injection of the ignition suppressors, and smokeless, ultra low NOx combustion was simultaneously realized over a wide operating range.

采用直接喷射点火抑制器的方法，对二甲醚诱导的HCCI发动机进行了点火正时控制、快速燃烧抑制和工作范围扩展的试验研究。采用化学动力学方法模拟了HCCI发动机的瞬态工况，并结合实验对点火抑制器的作用进行了分析。反应抑制剂减少了低温氧化反应，延迟了高温氧化反应的开始。化学动力学分析表明，在不降低温度的情况下注入抑制剂时，预混电荷中的OH，O和H自由基浓度降低。在这里测试的点火抑制剂中，醇类具有更大的自由基还原效果，导致比水、氢和甲烷更强的点火抑制，并且甲醇在醇类中具有最强的效果。水对降低温度的作用更大，而甲醇对自由基还原的化学作用更强。低温氧化的还原抑制了反应后的温度升高，并且该温度降低延迟了高温氧化的开始。当抑制剂喷射正时设置在低氧化出现之后时，反应抑制效果没有影响，并且随着抑制剂喷射正时的提前，反应抑制效果增加。点火正时的控制，抑制快速燃烧，和扩展的操作范围，以负荷相当于普通柴油机操作，实现了与直接喷射的点火抑制器，无烟，超低NOx燃烧，同时实现了广泛的操作范围。