合成气预混火焰的热声振荡

使用天然气、氢气与氮气的合成气作为燃料,在模型燃烧室中对合成气的燃烧稳定性进行实验研究,利用动态压力传感器和ICCD相同步测量技术实现对压力和火焰面的测量.实验中保持氮气体积分数恒定在20%,通过改变天然气与氢气的体积比,对不同当量比和热值下的合成气燃烧稳定性进行研究,并对热声耦合振荡模态及其变化规律进行了分析,得到了合成气燃烧热声耦合的稳定范围,实验中发现,随着氢气体积分数的增加,发生热声耦合振荡的范围逐渐增大,然而振荡强度和天然气燃烧相比有所降低,声压级降低2～3,dB.

Thermo-Acoustic Oscillation of Premixed Syngas

Using hydrogen,methane,nitrogen with different ratios as syngas,experiments were conducted at a variety of equivalence ratios,hydrogen volume ratios and heat power to get a stability map in a laboratory gas turbine model combustor.Dynamic pressure transducers and ICCD were employed to test the thremo-acoustic conditions.With nitrogen volume ratio fixed(20%),thermo-acoustic oscillation was obtained as a function of hydrogen volume ratios and equivalence ratios.In order to get different modes and regularity of oscillation alteration,various hydrogen and methane volume ratios were performed.A stability map was obtained under different syngas operating conditions.It is observed that,with the increase of hydrogen content,thermo-acoustic oscillation range gets enlarged and pressure oscillations tend to become lower amplitude corresponding to methane condition.