替代燃料贫油熄火边界影响因素

为了研究燃油以及入口空气压力对于贫油熄火(LBO)边界的影响大小及规律,采用航空煤油(RP-3)、高沸点费托油(FT)和柴油进行了三种不同燃烧室入口压力工况下的贫油熄火实验并进行规律分析。分析结果表明:入口压力对贫油熄火边界的影响(19.17%)要大于燃油性质造成的影响(6.26%)。导致熄火油气比变化的主要因素包括入口空气压力,火焰体积,燃烧室温度,燃油雾化直径以及燃油的热值和密度,其中火焰体积和燃油雾化直径主要受燃油性质影响,而燃烧室温度则与入口压力有很大关系。入口压力影响的贫油熄火油气比变化会受其影响的火焰体积和燃烧室温度变化而削弱。碳数高支链烷烃含量少的燃油可能会提高火焰体积对熄火油气比的影响,使其在低入口压力下有更好的贫油熄火边界。 

Influencing factors of the lean blowout of alternative fuels

In order to research the effect of fuel and inlet air pressure on the lean blowout (LBO), the experiment using standard kerosene fuel (RP-3), diesel and high boiling Fischer-Tropsch oil (FT) in three different combustor inlet pressures was conducted. The results showed that the influence of inlet pressure (19.17%) on LBO was greater than the effect of fuel (6.26%). The main factors of LBO include inlet air pressure, flame volume, combustion temperature, the fuel atomization diameter and the LHV and density of fuel. The flame volume and fuel atomization diameter were mainly affected by the fuel property while the combustion temperature was mainly influenced by the inlet pressure. The change of LBO affected by inlet pressure was attenuated by the affected flame volume and combustion temperature. Fuels with low carbon number and high alkane content may increase the effect of flame volume on LBO, and result in a better LBO in low inlet pressure.