摘要
甲烷燃烧具有环境污染小、放热量大等优点,但甲烷燃烧转化率受很多因素影响,因此,研究甲烷燃烧过程的转化率就显得尤为重要。基于计算流体力学中的涡耗散模型,运用有限容积法建立甲烷和空气非预混燃烧与扩散数学模型。针对具有3个小挡板,一个喷嘴的圆柱型燃烧器进行数值研究。结论:随着不同入口空气速度的逐渐增加,甲烷-空气非预混燃烧反应不充分,在轴向距离2 m处,反应生成的水和二氧化碳的含量逐渐减少,然而氧气增多,甲烷燃烧的转化率变低;随着不同入口甲烷速度的逐渐增加,甲烷-空气非预混燃烧反应充分,转化率变高;随着不同入口甲烷温度的增加,氧气浓度增加,甲烷-空气非预混燃烧反应不充分,转化率降低。
Methane burning has the advantage of little environment pollutant and a big output of heat,but there are many factors influencing the conversion rate of methane burning,so it is important to research the conversion rate of methane burning.Based on the vortex dissipation model in CFD（Computational Fluid Dynamics）,a mathematical model for the non-premixed burning and diffusion of methane with air was constructed by using the finite volume method.Then a simulation was conducted in a cylindrical combustor with 3 small baffles and a nozzle.It is concluded that,with the increasing of the air velocity at different inlets,the non-premixed burning of methane with air is incomplete,at the axial distance of 2 meters,the content of water and carbon dioxide decreases gradually,but the content of oxygen increases and the conversion rate becomes low.With the increasing of the methane velocity at different inlets,the non-premixed burning of methane with air is complete with a high conversion rate.With the increasing of the methane temperature at different inlets,the concentration of oxygen rises,and the non-premixed burning of methane with air is incomplete with a low conversion rate.
出处
《中国安全科学学报》
CAS
CSCD
北大核心
2010年第10期88-91,共4页
China Safety Science Journal
基金
辽宁省自然科学基金资助(20082186)
关键词
圆柱型燃烧器
甲烷
入口速度
入口温度
数值研究
cylindrical combustor
methane
inlet velocity
inlet temperature
numerical research
