壁面边界条件下氢气-空气预混燃烧的压力特性

摘要

通过纹影测试的实验方法,在顶置点火定容燃烧弹中对壁面边界条件下的氢气-空气预混燃烧压力特性进行了实验研究,得出了不同燃烧当量比(0.6～2.0)、初始压力(0.1～0.3 MPa)、初始温度(300～450 K)下的氢气-空气预混燃烧过程中燃烧压力、最大燃烧压力以及最大燃烧压力升高率等参数的变化规律.结果表明,壁面边界条件下氢气-空气预混燃烧过程中的最大燃烧压力以及最大燃烧压力升高率均随着当量比的增大先增大再减小,均随初始压力的增大呈现出线性增长,随着初始温度的增大而呈现出线性减少.%By means of the Schlieren method,the combustion pressure characteristics of hydrogen-air pre-mixture under wall boundary conditions have been studied in a constant volume combustion bomb with the ignition point located in the upper part of the bomb.The combustion pressure,maxinum combustion pressure,and maximum rate of pressure rise were compared and analyzed at different fuel-equivalence ratios (0.6-2.0),initial pressures (0.1-0.3 MPa),and initial temperatures (300-450 K).The experimental results showed that both the maximum combustion pressure and the maximum rate of pressure rise of hydrogen-air pre-mixture under wall boundary conditions firstly increase and then decrease with the increase of equivalence ratio,and monotonously linearly increase with the increase of initial pressure and/or the decrease of initial temperature.