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为了更加深入地研究硼粒子的点火和燃烧机理,在Pasternkck和Zhou的模型的基础上,通过补充基元反应和修正基元反应的动力学参数,建立起了新的C/H/O/N/B体系气相燃烧动力学模型,该模型包含31种组分,190个正反基元反应。采用新的模型对贫氧体系气相燃烧过程进行计算,并改变体系的初始温度及压强,研究其对平衡温度和硼的氧化物平衡摩尔分数的影响。计算结果表明:(1)体系平衡后硼元素主要以硼的氧化物形式存在,其中BO和BO2的摩尔分数随反应时间的增加先升高后降低,B2O3的摩尔分数随着反应时间的增加而不断升高。(2)提高初始温度和压强不但能使体系的平衡温度提高,而且能缩短体系达到平衡的时间。(3)提高初始温度会使B2O3更多地解离为BO和BO2,不利于硼燃料能量的完全释放,但提高压强会抵制B2O3的解离,从而会在一定程度上提高硼燃料的能量释放。
In order to study the ignition and combustion mechanism of boron particles more deeply, a new C / H / O / N ratio was established based on the model of Pasternkck and Zhou by adding elementary reactions and modifying kinetic parameters of elementary reactions / B system vapor phase combustion kinetics model, the model contains 31 components, 190 positive and negative reaction. A new model was used to calculate the gas phase combustion process in the oxygen-poor system. The initial temperature and pressure of the system were changed, and the influence of equilibrium temperature and molar fraction of boron oxide balance was studied. The results show that: (1) The boron is mainly in the form of boron oxides after the system is equilibrated, in which the mole fraction of BO and BO2 firstly increases and then decreases with the increase of reaction time. The mole fraction of B2O3 increases with the increase of reaction time Keep rising. (2) Increasing the initial temperature and pressure can not only improve the equilibrium temperature of the system, but also shorten the time for the system to reach equilibrium. (3) Increasing the initial temperature will dissociate B2O3 more into BO and BO2, which is not conducive to the complete release of boron fuel energy, but increasing the pressure will resist the dissociation of B2O3, which will improve the energy release of boron fuel to a certain extent .