Effect of Toluene Addition on Ignition Characteristics of N-Heptane under High CO2 Concentration

ZHANG Yuewei; YAO Shengzhuo; LIU Yongfeng; LIU Haifeng; SONG Jin′ou

Vehicle Engine ›› 2022, Vol. 0 ›› Issue (4) : 8-16.

Effect of Toluene Addition on Ignition Characteristics of N-Heptane under High CO₂Concentration

ZHANG Yuewei¹,YAO Shengzhuo¹,LIU Yongfeng¹,LIU Haifeng²,SONG Jin′ou²

Author information +

History +

Abstract

In order to research the ignition characteristics of diesel in CO₂-O₂ environment, an ignition delay time model was established using mixture of 70% nheptane and 30% toluene as diesel fuel. The model took into account the flame retardant effect of high CO₂ concentration on ignition and obtained the functional relationship of ignition delay time with temperature, density and concentration by using multiple linear regression analysis method. The ignition delay time model was verified by combining the simulation of nheptane/toluene coupling mechanism and the test of visual constant volume combustion bomb, and the important factors affecting the ignition characteristics under different working conditions were investigated. The results show that the model can well predict the diesel ignition delay time in CO₂-O₂ environment, and the average error is 5.71% in 50%CO₂environment. The thermal effect of CO₂ plays a dominant role in the impact on ignition delay time and the thirdbody collision effect of CO₂ promtes significantly the ignition when the CO₂volume fraction is greater than 60%. In addition, the CO₂ concentration variation has a significant effect on the rate of OH radical production.

Key words

n-heptane / toluene / constant volume combustion bomb / ignition characteristics

Cite this article

EndNote

Ris (Procite)

Bibtex

Download Citations

ZHANG Yuewei,YAO Shengzhuo,LIU Yongfeng,LIU Haifeng,SONG Jin′ou. Effect of Toluene Addition on Ignition Characteristics of N-Heptane under High CO₂Concentration[J]. Vehicle Engine. 2022, 0(4): 8-16