张天浩,吴浩卿,吕兴才.甲醇–柴油双燃料高压直喷射流火焰相互作用的光学可视化研究[J].内燃机工程,2025,46(4):41-48.
甲醇–柴油双燃料高压直喷射流火焰相互作用的光学可视化研究
Optical Diagnosis of the Flame Interaction Under Methanol–Diesel Dual-Fuel Direct-Injection Conditions
DOI：10.13949/j.cnki.nrjgc.2025.04.005
关键词:甲醇–柴油双燃料直喷  OH*化学发光  定容燃烧弹  射流火焰  油束碰撞
Key Words:methanol–diesel dual-fuel direct injection  OH* chemiluminescence  constant volume combustion bomb  jet flame  oil beam collision
基金项目:
作者单位E-mail
张天浩* 上海交通大学 中英国际低碳学院，上海 200240 122280910067@sjtu.edu.cn 
吴浩卿* 上海交通大学 机械与动力工程学院，上海 200240 wuhaoqing66@sjtu.edu.cn 
吕兴才 上海交通大学 机械与动力工程学院，上海 200240 lyuxc@sjtu.edu.cn 
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摘要:为了研究柴油喷射压力、甲醇替代率对甲醇–柴油双直喷火焰发展的火焰形状、反应区性质、反应中间产物分布等的影响，在定容燃烧弹上采用OH*化学发光和火焰自发光高速同步成像技术对甲醇–柴油双直喷火焰进行可视化研究。研究结果表明：柴油喷射压力较低时雾化较差，部分油滴与甲醇碰撞后才充分燃烧。喷射压力较高时喷射脉宽变短，助燃效果变弱。甲醇替代率的选择需要平衡燃烧性能和尾气排放，其对双直喷射流火焰的形状、柴油在火焰中的分布也有重要影响。当甲醇替代率从60%升高到90%时，峰值放热速率下降了33.2%。
Abstract:In order to study the effects of diesel injection pressures and methanol substitution rates on the flame shapes， reaction zone properties and distribution of reaction intermediates in the development of methanol–diesel dual direct injection flame， the visualization of methanol–diesel dual direct injection flame was studied by using OH* chemiluminescence and flame self-luminescence high-speed synchronous imaging techniques on constant volume combustion chamber （CVCC）. The results show that when the injection pressure is low， the atomization is poor， and some oil droplets are fully burned after colliding with methanol. When the injection pressure is high， the injection pulse width is shorter and the combusting effect is weaker. The selection of methanol substitution rate needs to balance combustion performance and exhaust emissions， which also has an important impact on the shape of the dual direct jet flame and the distribution of diesel fuel in the flame. When the methanol substitution rate increases from 60% to 90%， the peak heat release rate decreases by 33.2%.
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