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采用详细化学反应动力学方法研究了3种烷烃燃料(正戊烷、正己烷和正庚烷)在O2/CO2气氛及空气气氛下的着火延迟特性,探讨了初始温度为1 000~1 350K,压力为1.6~4.0MPa,过氧系数为0.7~1.3条件下,不同燃烧气氛、CO2体积分数、温度、压力、过氧系数等因素对3种烷烃燃料着火延迟的影响规律.结果表明:在相同初始O2体积分数条件下,高CO2体积分数气氛下3种烷烃燃料的着火延迟时间比空气气氛下明显延长;随着燃烧系统中初始CO2体积分数的增加,3种烷烃燃料的着火延迟时间进一步增加,O2/CO2气氛下出现着火延迟现象不仅与CO2的热物性有关,还与燃烧系统内CO2的化学反应动力学作用有关.
The ignition delay characteristics of three kinds of alkane fuel (n-pentane, n-hexane and n-heptane) in O2 / CO2 atmosphere and air atmosphere were studied by chemical reaction kinetics. The initial temperature was 1000 ~ 1 350K, And the influence of different combustion atmosphere, CO2 volume fraction, temperature, pressure and peroxygen coefficient on the ignition delay of three kinds of alkane fuels under the conditions of 1.6 ~ 4.0MPa and oxygen coefficient of 0.7 ~ 1.3.The results show that in the same initial The ignition delay time of three alkane fuels under the atmosphere of high CO2 volume fraction was significantly longer than that of air under the O2 volume fraction. With the increase of the initial CO2 volume fraction in the combustion system, the ignition delay time of the three alkane fuels increased further, The fire delay in O2 / CO2 atmosphere is not only related to the thermophysical properties of CO2 but also to the chemical reaction kinetics of CO2 in the combustion system.