中心分级燃烧室预燃级贫油熄火性能试验

对一种单环腔的中心分级LESS（low emissions stirred swirl）燃烧室进行了常压状态下的贫油熄火性能试验研究.采用单头部试验件，研究了预燃级离心喷嘴流量数、进口温度及燃料类型对贫油熄火性能的影响.结果表明:预燃级采用小流量数的离心喷嘴能够降低贫油熄火当量比.进口温度低于150℃的范围内，随着进口温度的增加，贫油熄火当量比迅速降低；进口温度高于150℃时，温度对贫油熄火当量比的影响作用不明显.气态燃料与液态燃料的贫油熄火当量比随火焰筒压降的变化趋势是不同的，但都趋于相同的值，且在5%的火焰筒压降范围内，气态燃料的贫油熄火当量比低于液态燃料. 

Experiment on lean blow-out performance of pilot stage in internally-staged combustor

An experimental research was conducted on the lean LBO (blow-out) performance at constant pressure status of internally-staged single annular layout LESS (low emissions stirred swirl) combustor. Using single head speeimen, this experiment mainly focused on the effect of three parameters on the combustor lean blow-out performance, i.e. mass flow number of the pilot stage centrifugal nozzle, inlet temperature and the fuel type, respectively. The experimental result shows that: the pilot stage centrifugal nozzle with small mass flow number can reduce LBO equivalence ratio. When the inlet temperature is below 150℃,increasing the inlet temperature can reduce LBO equivalence ratio rapidly; but there is little effect when the inlet temperature exceeds 150℃. LBO equivalence ratio variational trends of gaseous fuel is different from those of liquid fuel with the flame tube pressure drop, but they tend to be the same value, and when the flame tube pressure drop is in the range of 5%, LBO equivalence ratio of gaseous fuel is less than that of liquid fuel.