不同稀释率下初始压力对层流燃烧火焰传播的影响

贾延林; 殷鹏翔; 韩志强; 肖邦

车用发动机 ›› 2020, Vol. 0 ›› Issue (2) : 15-22.

栏目

不同稀释率下初始压力对层流燃烧火焰传播的影响

贾延林¹，殷鹏翔¹，韩志强²，肖邦²

作者信息 +

Effect of Initial Pressure on Laminar Combustion Flame Propagation at Different Dilution Rates

JIA Yanlin¹,YIN Pengxiang¹，HAN Zhiqiang²，XIAO Bang²

Author information +

文章历史 +

摘要

选取试验工况T=348 K，P=0.10~0.30 MPa，Φ=1.0，Φ_r=0%~8%下的纹影图片，研究了稀释率和初始压力对层流燃烧火焰传播的影响，以及测量角步长对火焰半径测量精度的影响，提出了相应的评价指标来描述火焰半径的分布状态，以得到更加精确的火焰半径值，为研究层流燃烧提供更加可靠的数据支持。研究表明，未稀释情况下的火焰稳定性较低，半径提取值波动较大，随着稀释率的增加，火焰稳定性增强，半径提取值波动减小。稀释情况下，随着稀释率增加和火焰半径增大，火焰稳定性降低，火焰传播不均匀性增加。

Abstract

The schlieren photographs of specified test conditions (T=348 K,P=0.10-0.30 MPa,Φ=1.0,Φ_r=0%-8%) were selected to study the effects of dilution rate and initial pressure on laminar combustion flame propagation and the effect of measuring angle step on the accuracy of flame radius measurement. The evaluation indicators were then proposed to describe the distribution of flame radius for obtaining a more accurate flame radius value, which could provide more reliable data for the study of laminar combustion. The results show that the flame stability is worse and the radius extraction value fluctuates greatly in the undiluted condition. The flame stability and the fluctuation improve with the increase of dilution rate. The flame stability becomes worse and the flame propagation gets uneven when both the dilution rate and flame radius increase in the diluted condition.