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利用定容弹和高速纹影摄像技术研究了初始压强50~101k Pa,当量比0.8~1.3的异辛烷预混层流火焰传播特性,分析了初始压强、当量比对层流燃烧速度和马克斯坦长度的影响。实验结果表明:异辛烷层流燃烧速度随初始压强的增加而减小;在不同初始压强条件下,最大层流燃烧速度都在当量比为1.1时获得;马克斯坦长度随当量比和初始压强的增加而减小;不同初始压强条件下,当量比为1.3时,马克斯坦长度接近于0,拉伸对火焰稳定性的影响最小;简化反应机理能很好地预测富燃条件下层流燃烧速度,贫燃时略大于实验结果。
The flame propagation characteristics of isooctane premixed laminar flow with initial pressure of 50 ~ 101kPa and equivalent ratio of 0.8 ~ 1.3 were studied by constant volume bombing and high speed profiling. The effects of initial pressure, equivalence ratio on the laminar flow rate, The impact of the length of Stan. The experimental results show that the laminar flow of iso-octane laminar flow decreases with the increase of initial pressure, and the maximum laminar flow velocity is obtained at equivalence ratio of 1.1 under different initial pressures. The marxan length increases with equivalence ratio and initial pressure , The length of marxan is close to 0 under the different initial pressure conditions, and the effect of stretching on the flame stability is minimal. The simplified reaction mechanism can well predict the laminar flow rate under rich conditions , Lean slightly more than the experimental results.