基于电场作用的微燃烧数值模拟及热力性能分析

Numerical simulation and thermal performance analysis of micro-combustion based on action of electric field

以管径为1 mm,2 mm,3 mm的3种陶瓷管作微燃烧器,采用Fluent软件对电场作用下甲烷和空气的微燃烧进行了数值模拟。研究表明:正电场可增加燃烧器内的燃烧火焰长度、最大气流速度以及最高温度;燃烧器内的最高温度与燃空比成反比;燃空比较小时的燃料转化率与管径成反比;燃空比较大时的燃料转化率与管径成正比。2 000 V以内的电压对微燃烧器内的最大流速、最高温度以及甲烷转化率影响不大;超过2 000 V的电压与微燃烧器内的最大流速、最高温度以及甲烷转化率成正比例关系。

Three ceramic tubes with 1 mm,2 mm and 3 mm in diameter were selected as a micro-burner.The combustion of methane and air in the micro-burner was emulated through the action of software Fluent on the electric field.The study shows that the positive electric field can increase the length of combustion flame,with the maximum flow velocity and the highest temperature in the burners.The highest temperature in the burners is inversely proportional to the fuel air ratio;the fuel conversion rate is inversely proportional to tube diameter with less fuel air ratio;the fuel conversion rate is directly proportional to tube diameter with larger fuel air ratio.The voltage less than 2 000 V doesn′t affect the maximum velocity,the highest temperature and methane conversion rate.The voltage more than 2 000 V is directly proportional to the maximum velocity,the highest temperature and methane conversion rate.