若干典型航空替代燃料组分的火焰传播研究

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  航空替代燃料组分的火焰传播研究对于认识高超声速发动机燃烧特性、开展燃烧室燃烧数值模拟具有重要意义。但由于航空替代燃料组分的沸点较高,因此目前对于其火焰传播的研究较为有限。本文利用球形火焰法研究了典型航空替代燃料组分乙基环己烷、十氢化萘和正十二烷在初始温度为423 K,初始压力为1-10 atm 以及宽广当量比范围下的火焰传播,测量了这些燃料在上述条件下的火焰传播速度和马克斯坦长度。测量结果表明三种燃料具有在1-10 atm 压力条件下具有非常相似的火焰传播速度,但却表现出不同的压力依赖效应。利用近年发展的燃烧反应动力学模型对火焰传播速率进行了数值模拟,模拟结果表明燃料的热力学效应并不会造成实验测得的火焰传播速度的差异。现有的模型对火焰传播速度的预测仍然存在着一定问题,需要进一步优化模型中具有压力依赖效应的反应以提高现有模型的预测能力。
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