Various swirlers with different swirl number(0.6—1.2)have been designed to study the influence of swirl number on the lean blowout performance of low calorific value gas(4.89—11.33,MJ/m3)which has CO as its major ingredient but not containing H2. The investigation under the current experimental condition shows that the lower calo-rific value of the fuel is,the smaller the swirl number at flameout will be. Meanwhile,the flame shape varies signifi-cantly with different swirl number. Compared with CO2,N2 has a more negative effect on the stability of premixed low calorific value gas flame. Furthermore,the swirler structures and associated parameters are obtained,with which the stable burning of low heat value gas(4.89—5.28,MJ/m3)with CO as its major ingredient can be observed.%设计了具有不同旋流数(0.6～1.2)的多个旋流器，针对以CO为主要成分且不含H2的低热值燃气(4.89～11.33,MJ/m3)进行实验，研究旋流对其预混燃烧熄火特性的影响．在实验参数范围内发现，热值越低的燃料，熄火时对应的旋流数越小；随着旋流数变化，熄火时火焰形状差异显著；N2对低热值燃料预混燃烧稳定性的负面作用比CO2更明显；通过实验得到能以预混燃烧方式稳燃低热值燃气(热值为4.89～5.28,MJ/m3且以 CO 为主要可燃成分)的旋流器结构和相关参数．
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