气量分配对轴径向旋流杯燃烧室贫熄边界的影响

针对轴径向旋流杯燃烧室,研究了头部进气面积及主燃孔布局对此类燃烧室贫熄特性的影响.实验结果表明:减小一级轴向旋流器进气面积和增加主燃孔个数对燃烧室贫熄性能有较大影响.一级进气面积减小20%可拓宽贫熄边界9.7%;增加主燃孔为4个时,燃烧室贫熄边界变宽约7.6%.此外,增加一级进气面积20%,改变二级进气面积20%及改变主燃孔个数为2个等情况对燃烧室贫熄边界影响较小. 

Effects of airflow split and primary holes arrangement on the lean blowout limits of a combustor with axial-radial swirl cup

An experiment was conducted for studying the effect of the variations of dome air entry areas and the arrangements of primary holes on the lean blowout (LBO) limits of a single dome rectangular model combustor with axial-radial swirl cup.The experimental results show that the decrease of air entry areas of the primary axial-swirler and the increase of primary holes' number have great effect on the LBO limits of the combustors.Decreasing of air entry areas into the primary axial-swirler by 20% will improve the combustor lean blowout limits about 9.7%,and increase of the number of primary holes to 4 will improve the combustor lean blowout limits about 7.6%.Besides,increase of air entry areas into the primary axial-swirler by 20%,change of air entry areas into the secondary radial-swirler by 20% and change of the number of primary holes to 2 have little effect on the combustor LBO limits.