A method to design a feasible multi-component test fuel for fuel concentration measurements by using PLIF was developed based on thermal gravity (TG)analysis and vapor-liquid equilibrium (VLE) calculations. The optimized multi-component fuel contains n-pentane (light fractions), isooctane, noctane (medium fractions), n-nonane and n-decane (heavy fiactions). It has the similar volatility to the real 93# gasoline and all the tracers have a good co-evaporation ratio. Acetone, toluene, and 1, 2, 4trimethylbenzene were separately chosen as tracers for the light, medium, and heavy components of gasoline. Optimized results of a six-component fuel (C4 added) and the advantages and disadvantages of this case are discussed. The temperature impact was also studied. Results show that the light and medium components in the fuel have smaller changes in co-evaporation ratio, while the heavy components show the difference. An optimization was made at 373 K to give better synchronous evaporation.%设计了基于热重分析与气液平衡(VLE)方程计算制备激光诱导荧光(LIF)测试用多组分燃油的基本方法,以满足LIF测试用燃油的挥发性既要接近真实燃油又要与示踪剂同步挥发的要求.以93#汽油为样本目标,制备了满足上述要求的LIF测试用燃油,其成分为正戊烷(代表轻组分),正辛烷、异辛烷(代表中组分),正壬烷、正癸烷(代表重组分),分别匹配丙酮、甲苯和三甲苯3种示踪剂.讨论了用C4类烷烃控制燃油轻组分与丙酮同步挥发率的方案及其优缺点,以及温度和示踪剂比例对同步挥发率的影响,结果表明示踪剂在一定范围内变化时前述方案中轻、中组分同步挥发率相对变化较小.针对温度373K条件下获得了燃油组分的优化结果.
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