正十六烷引燃甲烷预混合气可视化实验研究  

Visualization study on methane premixture ignited by pilot n-hexadecane

作　　者：崔泽川 张晓磊 银硕 郁晓健 田江平[1] 隆武强[1] CUI Zechuan;ZHANG Xiaolei;YIN Shuo;YU Xiaojian;TIAN Jiangping;LONG Wuqiang(Institute of Internal Combustion Engine,Dalian Unversity of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学内燃机研究所,辽宁大连116024

出　　处：《哈尔滨工程大学学报》2024年第2期284-290,共7页Journal of Harbin Engineering University

基　　金：国家自然科学基金项目(52071064)。

摘　　要：为探究环境温度、甲烷预混时间以及引燃燃料喷射压力对正十六烷引燃甲烷预混合气着火及火焰传播特性的影响,本文利用高速摄影技术及阴影拍摄方法,基于定容光学测试系统进行了可视化实验。研究结果表明:提高环境温度,引燃燃料滞燃期缩短,火焰发展速率增加并出现主燃区外预混合气局部着火;预混时间较短时,燃烧产生的碳烟较多,火焰发展速率随混合时间的增加而减小,当预混时间较长时,火焰发展速率趋于稳定;提高引燃燃料喷射压力,引燃燃料喷雾贯穿距离增大,滞燃期缩短,起始着火点位置发生变化,火焰发展速率增加。To study the effects of ambient temperature,methane premix time,and pilot fuel injection pressure on the ignition and combustion characteristics of methane premixture ignited by pilot-injected n-hexadecane,a visual-ization experiment was performed on a constant volume optical testing system using high-speed photography and shadow shooting method.The results revealed that with increasing ambient temperature,the delay period of pilot fuel ignition was shortened,the development of methane flame was accelerated,and the premixture outside the main combustion area ignited locally.When the methane premix time was short,more soot was formed,and the flame development rate decreased with increasing premix time.When the premix time was long,the flame develop-ment rate tended to be stable.Moreover,with increasing pilot fuel injection pressure,the flame penetration length of the pilot fuel increased,the ignition delay period shortened,the initial ignition position moved,and the flame development rate increased.

关 键 词：双燃料 甲烷 引燃喷射 预混燃烧 燃烧特性 阴影法 可视化 定容弹 

分 类 号：TK4[动力工程及工程热物理—动力机械及工程]