【摘要】 采用Longwell良搅拌反应器模型和详细化学反应机理对微尺度空腔内气体预混燃烧过程进行了零维数值模拟,从微腔体内稳定燃烧的临界半径、点火极限以及稳定流率范围着手,分析了不同预混气成分、不同当量比和不同环境对流换热系数等外部条件对微尺度燃烧点火与熄火特性的影响.稳定燃烧时,大腔体可对应较大的上极限流率,低预混气流率可对应较小的下临界半径;腔体越小(或流率越大),系统启动所需的温度和压力越高.更多还原

【Abstract】 A zero-dimensional modeling was performed for premixed combustions in micro-scaled chambers.The model is based on the ’Longwell’ well-stirred reactor and detailed chemical mechanisms.The ignition and extinction characteristics of micro-combustion were analyzed using different fuel/oxidant mixtures at various equivalence ratios and various coefficients of heat loss.The critical radius,explosion limits,and ranges of mass flow rates required for stable combustion were also analyzed.For stable combustion,larger mass flow rates can be realized for smaller chambers.The smaller the chambers(or the higher the mass flow rates),the higher the temperature and pressure are required for system startup.更多还原