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超燃研究地面实验中通过燃烧加热方式获得的高焓气体中通常含有H2O和CO2等污染组分,污染组分可能造成地面实验与实际飞行中燃料着火特性不一致。为了正确评估这两种污染组分对碳氢燃料着火特性的影响,在预加热激波管中研究了H2O和CO2对RP-3航空煤油着火特性的影响效应。根据超燃研究的实际应用需求,以压力为0.05,0.1,0.2MPa和化学当量比为0.5,1条件下RP-3航空煤油在纯净气体中着火特性为基础,分别进行了单独加入4%和25%的H2O,单独加入3%和10%的CO2,以及同时加入15%H2O+10%CO2条件下,污染组分对RP-3航空煤油着火特性影响的对比实验研究。结果表明:0.1MPa时,H2O和CO2单独以及同时存在时对煤油着火基本都没有影响。在0.05和0.2MPa时,H2O对煤油着火具有明显促进作用,CO2对煤油着火产生阻滞作用;当H2O和CO2同时存在且压力为0.05和0.2MPa时,污染组分15%H2O+10%CO2在较大温度范围内表现出对煤油着火的促进作用。从燃烧反应机理和热物理性质的角度对实验结果进行了初步分析。
Supramolecular combustion In ground experiments, high-enthalpy gases obtained by combustion heating often contain contaminants such as H2O and CO2. The contaminated components may cause inconsistencies between the ground-based experiments and the actual in-flight fuel ignition characteristics. In order to correctly evaluate the influence of these two pollution components on the ignition characteristics of hydrocarbon fuels, the effect of H2O and CO2 on the ignition characteristics of RP-3 aviation kerosene was studied in a preheated shock tube. According to the actual application requirements of flammable gas research, based on the ignition characteristics of RP-3 aviation kerosene in pure gas under the pressure of 0.05, 0.1 and 0.2 MPa and the stoichiometric ratio of 0.5 and 1, respectively, 4% A comparative experimental study on the influence of contaminated components on the ignition characteristics of RP-3 aviation kerosene with 25% H2O, 3% and 10% CO2 alone, and the simultaneous addition of 15% H2O + 10% CO2 was conducted. The results show that: 0.1MPa, H2O and CO2 alone and at the same time have no effect on the basic kerosene fire. At 0.05 and 0.2 MPa, H 2 O has a significant role in promoting kerosene ignition, while CO 2 has a retarding effect on kerosene ignition. When H 2 O and CO 2 are simultaneously present and pressures are 0.05 and 0.2 MPa, 15% H 2 O + 10% CO 2 In a larger temperature range shows the promotion of kerosene fire. The experimental results are preliminary analyzed from the perspective of combustion reaction mechanism and thermophysical properties.