摘要
通过数值模拟方法研究了燃烧室入口压力P对某环形燃烧室内的燃烧及热力型NO_x生成特性的影响。分析表明:增大入口压力P使得流体密度ρ增大,流速U减小;回流区范围减小,火焰温度T有所降低,高温区范围缩小;主燃级O原子摩尔浓度升高,热力型NO_x生成速率增大。热力型NO_x生成速率最大的区域位于凸台后回流区附近,火焰温度T的降低在一定程度上抑制了该区域热力型NO_x生成速率的增长。不同入口压力P条件下,外壳侧NO_x生成速率均高于轮毂侧。
The impact of combustor inlet pressure on combustion and thermal NO_xformation characteristic in an annular combustion chamber was simulated numerically by commercial CFD code Fluent.The predicted results show that the increase of inlet pressure increases the density of gas flow,and thus decreases the velocity of gas flow and magnitude of back flow regions which reduce flame temperature and high temperature zone near those regions.The mole concentration of oxygen atom increases with inlet pressure which accelerates the generation of thermal NO_xin premixed flame.The region of the highest thermal NO_xformation rate is near the boss of the combustion chamber.Fall of flame temperature in those regions reduces the growth rate of thermal NO_xformation to some extent.The formation rate of thermal NO_xnear the crust are relatively higher than that of hub side under different inlet pressures.
出处
《热能动力工程》
CAS
CSCD
北大核心
2016年第6期35-41,122,共7页
Journal of Engineering for Thermal Energy and Power
基金
中央高校基本科研业务费专项资金资助项目(2014ZZD04
2014XS17)
关键词
燃气轮机
环形燃烧室
入口压力
回流区
gas turbine
annular combustion chamber
inlet pressure
back flow region
