摘要
在383,K、0.1,MPa的初始条件下,利用定容燃烧弹装置和高速纹影摄像系统开展了含水乙醇在不同的体积分数(水的体积分数为0～30%)和当量比(0.8～1.6)下与空气预混的层流燃烧特性试验.结果表明:混合气的无拉伸层流火焰传播速率和燃烧速率随含水量的增加而降低;当水的体积分数小于30%,火焰速率的最大值出现在当量比为1.2附近,而在水的体积分数达到30%时,其最大值开始向1.0的方向移动;含水乙醇-空气火焰的马克斯坦长度和前锋面的稳定性都随当量比增加而下降,随含水量的增加而增加,并在当量比为1.6时,马克斯坦长度由正值变为负值;无量纲的层流燃烧速率随水的稀释率呈线性下降,随当量比的影响不大.
The constant-volume combustion vessel and high-speed schlieren visualization system were employed to investigate laminar premixed combustion characteristics of hydrous ethanol-air gaseous mix- tures at an initial temperature of 383 K, and pressure of 0.1 MPa, with volume fractions of water in etha- nol from 0% to 30%, and equivalence ratios from 0.8 to 1.6. Results show that the unstretched flame propagation speeds and burning velocities decrease with increasing water content in hydrous ethanol. Peak values of flame speeds appear at equivalence ratio of 1.2 when volume fraction of water is below 30%, while peak values shift to stoichiometric equivalence ratio when volume fraction of water is over 30%. The burned gas Markstein length and flame stability decrease with increasing equivalence ratio, and they in- crease with increasing volume fraction of water. Markstein length changes from the positive value to the negative one when equivalence ratio reaches 1.6. The normalized laminar burning velocities decrease line- arly with increasing dilution ratio of water, while equivalence ratio has little effect on them.
出处
《内燃机学报》
EI
CAS
CSCD
北大核心
2013年第1期59-64,共6页
Transactions of Csice
基金
湖北省自然科学基金重点资助项目(2011CDA058)
关键词
含水乙醇
定容燃烧弹
层流燃烧速率
hydrous ethanol
constant-volume combustion vessel
laminar burning velocity
