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为研究温度和H2,CO,F等组分影响气相硼燃烧的化学反应动力学机制,利用基于CHEMKIN建立的B/C/H/O/N/F体系的反应动力学机理,模拟了温度和各自由基摩尔分数随时间的变化,并通过敏感性分析和化学反应速率分析研究了不同条件下影响气相硼燃烧的主要基元反应。结果表明,影响气相硼燃烧的主要反应式是R31 BO+O+M=BO2+M,BO的氧化速率决定了气相硼燃烧的快慢;提高初始温度,BO的氧化途径仍为R31;添加0.5%CO可以增加O自由基浓度,加快R31的反应速率;添加0.5%F后BO的氧化途径增加了反应式R183 BO+F+M=OBF+M,加快BO的氧化速率;添加0.5%H2后BO的氧化途径转变为R36 BO+H+M=HBO+M,R35 BO+OH+M=HBO2+M和R58 BO2+H+M=HBO2+M,加快BO的氧化速率从而缩短延迟时间;在含有H2的初始组分中,气相硼燃烧的主导反应过程:B2O2/HBO→BO→BO2→HBO2。
In order to study the chemical reaction kinetics mechanism of temperature, H2, CO, F and other components affecting gas-phase boron combustion, the reaction kinetics mechanism based on B / C / H / O / N / F system established by CHEMKIN was used to simulate the temperature and The change of the mole fraction of free radicals with time, and through the sensitivity analysis and chemical reaction rate analysis, the main elementary reactions that affect the gas-phase boron combustion under different conditions were studied. The results show that the main reaction equation affecting the combustion of gaseous boron is R31 BO + O + M = BO2 + M. The oxidation rate of BO determines the combustion speed of gaseous boron. At the initial temperature, the oxidation route of BO is still R31. Adding 0.5% CO can increase the concentration of O radicals and accelerate the reaction rate of R31; after adding 0.5% F, the oxidation pathway of BO increases the reaction rate of R183 BO + F + M = OBF + M, accelerating the oxidation rate of BO; after adding 0.5% Of the oxidation pathway into R36 BO + H + M = HBO + M, R35 BO + OH + M = HBO2 + M and R58 BO2 + H + M = HBO2 + M, to accelerate the oxidation rate of BO thereby shortening the delay time; In the initial component of H2, the dominant reaction process of gas-phase boron combustion is: B2O2 / HBO → BO → BO2 → HBO2.