直混燃烧与LPP组合燃烧室数值研究

设计了直混燃烧与贫油预混预蒸发(LPP)组合的单管燃烧室.燃烧室头部采用同轴同旋向主模旋流器和副模旋流器结构,主、副油路分别采用直射式喷嘴和压力雾化喷嘴,可以在单管燃烧室上掌握和实现低污染燃烧排放控制技术,并采用Fluent软件对设计的单管燃烧室模型进行数值模拟.计算结果表明:主副模燃烧区相互独立;副模是直混燃烧,主要作用稳定火焰.主模是预混燃烧,燃烧区温度分布均匀,从而实现低NOx排放.解决了大工况下低NOx排放与慢车贫油熄火之间的矛盾.

Numerical investigation of combination of direct mixing combustion and LPP combustor

A combination of direct mixing combustion and lean premixed prevaporized(LPP) single-module tubular combustor was designed.Numerical investigation of the combustor was conducted with software fluent.The results show that main flame zone is independent from pilot flame zone;pilot module operates as a direct mixing flame for anchoring main flame.Main module operates as a premixed flame,providing a uniform temperature distribution in combustion zone,which reduces NO_x emissions.The contradiction was solved between the low NO_x emissions at high power conditions and flame stabilization at low power conditions.