合成气微型燃气轮机旋流燃烧特性数值模拟  

Numerical study on swirl combustion characteristics of micro gas turbine combustor burning syngas

作　　者：付忠广[1] 张译中[1] 卢可[1] 曹常青[1] 

机构地区：[1]华北电力大学国家火力发电工程技术研究中心,北京102206

出　　处：《热力发电》2015年第3期15-20,共6页Thermal Power Generation

基　　金：中央高校基本科研业务费专项资金资助(13XS09;2014ZZD04)

摘　　要：以某合成气微型燃气轮机为例,通过改变其燃烧室旋流喷嘴的角度增加旋流强度,并采用数值模拟的方法从主燃区旋流强度及值班区旋流强度两方面对比分析了微型燃气轮机的旋流燃烧特性,结果表明:随着主燃区旋流强度的增加,回流区面积明显增大,燃料、空气均匀混合并迅速燃烧;但并非旋流强度越大越好,当主燃区旋流强度增大到一定程度时,回流区已经影响到了燃烧室出口处的气流流动,不利于流场的稳定,因此存在最佳的旋流角度使燃烧达到最佳的效果;值班区旋流强度的改变对燃烧流场影响不大。By taking a micro gas turbine combustor as the example,the angle of swirl nozzles was changed to increase the swirl strength and numerical simulation was carried out to investigate the swirl combustion characteristics,through comparison of swirl strength in main combustion zone and that in pilot zone. The results show that,with an increase in swirl strength of the main combustion zone,the recirculation zone area increases dramatically,the fuel and air mixes uniformly and burns quickly. However,once the swirl strength in main combustion zone increases to a certain degree,the circulation zone will affect the air flow at the combustor outlet,which goes against the flow field＇s stability,so there must be an optimal swirl angle which can gain a perfect combustion effect. Changes in swirl strength in pilot zone affect little on the flow field during combustion.

关 键 词：微型燃气轮机 合成气 旋流强度 燃烧特性 数值模拟 

分 类 号：TK16[动力工程及工程热物理—热能工程]