高温空气对燃烧回流区流动影响的数值模拟

Numerical Simulation of Influence of High Temperature Air on Flow in Combustion Backfolw Section

通过建立圆管状燃烧室内甲烷气体燃烧的数学模型,对燃烧室回流区的温度场、速度场、流场以及甲烷、氧气、二氧化碳以及氮氧化合物的质量分数进行了数值模拟。通过改变入口高温空气的预热温度,数值模拟了以上变量的分布规律。研究结果表明,提高空气的预热温度,燃烧室内的反应进行越彻底,温度分布更均匀。研究结果对燃烧室的设计和燃烧室工况分析具有指导意义,所建立的数学模型为燃烧室几何和结构设计和燃烧过程操作中进行定量分析的有效手段。

By establishing the mathematical model of methane combustion in tubular chamber, the numerical simulation of temperature field, velocity field, flow field and mass of methane, oxygen, carbon dioxide and as well as oxy-nitride in reflux area of combustion chamber are carried on in this paper. By changing preheating temperature of entry hot-air, the distribution regularities of above mentioned variables were modeled numerically. The research results show that the reaction in the combustion chamber proceeded thoroughly, and temperature distribution much uniform when air preheating temperature was increased. These research results indicate that mathematical model established would be an efficient tool in mass analysis during design.