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Intermittent Combustion Mechanism of Ester-Series Oxygenated Compounds

酯系含氧化合物的间歇燃烧机理

基本信息

批准号：
11450081
负责人：
MIYAMOTO Noboru
金额：
$ 9.6万
依托单位：
HOKKAIDO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B).
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11450081/
关键词：
Oxygenates Ignition Thermal cracking Pollutants Carbon particles Intermittent combustion 噴霧特性 NO生成特性

项目摘要

This research investigated the fundamental thermal properties and intermittent combustion characteristics for various oxygenated compounds including esters, carbonates, acetates, alcohols and so on.The results are summarized as follows ;Basic thermal properties of various oxygenates including heat values, theoretical air, adiabatic flame temperatures and aquilibrium NO concentrations did not depend on the kinds of oxygenates but only on their oxygen contents, decreasing linearly with an increase in oxygen contents. CO2 amounts per unity of heat values for the oxygenates were also determined only by oxygen contents, showing higher amounts than that of usual HC fuels above oxygen contents of 30%.The use of oxygenates in intermittent compression ignition engines was proved to improve carbon particulates significantly, also to improve thermal efficiency and NOx. The carbon particulates disappeared perfectly above oxygen contents of 38% even at stoichometric mixtures, suggesting that combustion with ultra low emission and high power could be achieved in compression ignition engines with combination of EGR and aftertreatment systems.The improvement of thermal efficiency with oxygenate blend fuels resulted from shorter combustion duration which were estimated by micro-explosion phenomena of an oxygenate blend droplet during combustion processes in high temperatures.

本文研究了酯类、碳酸酯类、乙酸酯类、醇类等含氧化合物的基本热性质和间歇燃烧特性，主要结果如下：各种含氧化合物的基本热性质，包括热值、理论空气、绝热火焰温度和平衡NO浓度，并不取决于含氧化合物的种类，而仅取决于它们的氧含量，随着氧含量的增加而线性降低。含氧化合物的单位热值CO2含量仅由氧含量决定，当氧含量超过30%时，其CO2含量高于常规HC燃料。在间歇压燃式发动机中使用含氧化合物可显著改善碳颗粒，并改善热效率和NOx。即使在化学计量混合物中，碳颗粒在氧含量为38%以上时也完全消失，结果表明，采用EGR和后处理系统的压燃式发动机可以实现超低排放和高功率燃烧，采用EGR和后处理系统的压燃式发动机热效率的提高是由于燃烧持续期缩短所致，在高温下燃烧过程中，共混物液滴的爆炸现象。