摘要
在一台电控共轨光学发动机上,采用高速摄影法对相同喷油策略下生物柴油和柴油的缸内燃烧过程进行研究,获取燃烧火焰图像,通过双色法得到缸内火焰温度和表征碳烟体积分数分布的KL因子,分析了生物柴油缸内燃烧温度和碳烟特性.研究表明,柴油机燃用生物柴油时,在分段喷射条件下,火焰亮度降低,火焰分布面积减小,火焰中高温(2,000,K以上)辐射面积和平均温度也低于柴油,同时,缸内碳烟总量在整个燃烧过程中均有所下降.生物柴油和柴油缸内碳烟体积分数分布与燃烧温度的关系大体一致:在1,650～2,050,K温度内,燃烧温度越高,碳烟体积分数越大,并在1,850～2,050,K内达到最大值;而当燃烧温度达到2,050～2,150,K时,碳烟体积分数明显降低.
Studies on biodiesel and diesel in an electronic-control optical engine, were conducted under the same injection strategy using the high-speed photography. From the two-color technique, the soot temperature and KL factor were obtained from flame images and were used to analyze the in-cylinder flame temperature and soot characteristics of biodiesel. Results show that the luminosity, distribution area, high temperature （above 2 000 K） zone and mean soot temperature of biodiesel flame of biodiesel are reduced compared to those of diesel flame. Under the same injection strategy, the in-cylinder inte- grated soot summation of biodiesel is less than that of diesel during the combustion period. The relation- ships between flame temperature and soot concentration are similar for biodiesel and diesel. Soot concen- tration increase with the increase of temperature from 1 650 K to 2 050 K, and reaches its maximum value between 1 850 K and 2 050 K, and then sharply reduce between 2 050 K and 2 150 K.
出处
《内燃机学报》
EI
CAS
CSCD
北大核心
2013年第4期296-301,共6页
Transactions of Csice
基金
北京理工大学优秀青年教师计划资助项目(2011YR0306)
高等学校学科创新引智计划资助项目(B12022)
关键词
生物柴油
光学发动机
双色法
温度
碳烟
biodiesel
optical engine
two-color method
temperature
soot
