基于化学动力的强迫对流下硼粒子的燃烧特性  

Combustion characteristics of boron particles in forced convective flow based on chemical kinetics

作　　者：方传波 夏智勋[2] 张旭荣[1] 余勇 袁天保 

机构地区：[1]火箭军研究院,北京100091 [2]国防科技大学高超声速冲压发动机技术重点实验室,长沙410073

出　　处：《固体火箭技术》2017年第6期678-685,共8页Journal of Solid Rocket Technology

基　　金：国家自然科学基金(51276194)

摘　　要：系统研究了固体火箭冲压发动机燃烧室内强迫对流下的硼粒子燃烧特性,考虑详细的化学动力学机理和气相凝结过程,建立了强迫对流下硼粒子燃烧特性物理数学模型;采用有限体积法求解含组分反应和输运过程的二维轴对称控制方程组,并验证了数值求解方法的正确性。研究了来流相对速度、硼粒子的半径、环境压力、氧气质量分数、环境温度等因素对强迫对流下硼粒子燃烧特性的影响,并详细分析了各因素的作用机制。研究结果表明,强迫对流下的硼粒子多组分燃烧火焰呈轴对称结构;当来流相对速度、粒子的半径、环境压力、环境中氧气质量分数增加时,硼粒子总的燃烧反应消耗速率加大;当硼粒子远离熄火边界时,环境温度对硼粒子总的反应速率影响较小。The combustion characteristics of boron particles in forced convective flow in Ducted Rockets are investigated sys- temically.A physical and mathematical model is proposed taking into account of the detailed chemical kinetics and the gas-phase condensation process.The two dimensional axi-symmetric governing equations incorporating species reactions and transport process are solved using a finite volume technique.First, the numerical simulation method has been validated.Then the factors such as the relative velocity of the incoming gas, particle radius, the ambient pressure, the ambient oxygen mass fraction and the surrounding temperature on the combustion characteristics of boron particles in forced convective flow are studied. The inherent mechanism for each factor is analyzed in detail. The results show that axi-symmetric combustion flame incorporating multi-species reactions is formed around the boron particle in forced convective flow.The total consumption rate in surface reactions would increase with the in- crease in the relative velocity of the incoming gas, particle radius, the ambient pressure and the ambient oxygen mass fraction.The surrounding temperature has relatively little impact on the total burning rate when the boron particle is far from extinction.

关 键 词：强迫对流 硼粒子 气相凝结过程 燃烧特性 

分 类 号：V512[航空宇航科学与技术—航空宇航推进理论与工程]