Abstract: Experimental investigations on combustion oscillation in boiler furnace were performed. The results showed that pulsating oscillation intensity of smoke in boiler furnace was in proportion to environmental disturbances, such as unstable blower airflow and variety of fuel-air ratio. Oscillation frequency of smoke was mainly less than 10 Hz, belonging to low frequency range. The experiments also showed that combustion oscillation would occur when the measured Re numbers went beyond a specific Re number. A criterion explaining combustion stability （critical Re）, was presented, and the expression of critical Re was also given. Improving critical Re numbers will enhance combustion stability, and so eliminate or weaken combustion oscillation. This paper can be useful in improving boiler furnace design.

摘要： 对锅炉炉膛内燃烧振荡现象进行了实验研究。结果表明，炉膛内烟气脉动强度与风机气流脉动、燃料空气比等外界扰动有关，且成比例增大；气流脉动频率主要集中在10 Hz以下，属低频振荡。实验证明当锅炉实测雷诺数值大于某临界值时即会发生燃烧振荡，由此提出了表征燃烧稳定特性的准则（临界雷诺数Recr），并给出了临界雷诺数的表达式。增大临界雷诺数可提高燃烧稳定性，从而消除或削弱燃烧振荡现象发生，该结论可供今后锅炉或炉窑燃烧室设计时参考。