本文探讨了黎开管系统中燃烧振荡的两类非线性现象—拍振和迟滞,通过改变燃料流量和当量比研究了这两类非线性现象的发生规律。实验发现拍振现象仅在热功率较小、当量比较低的条件下发生;迟滞现象在发生燃烧振荡的当量比上限附近较显著,而当量比下限附近不明显。对于燃烧振荡中的拍振现象,通过热声耦合分析,结合弥散模型和声波传播关系,反演得到了火焰传递函数(FTF),结果可为进一步分析与控制这类非线性振荡现象提供参考。 In this paper, we discuss two types of non-linear phenomena of combustion oscillations in LiKui tube system-beat vibration and hysteresis. By studying the relationship between fuel flow rate and equivalence ratio, we study the law of these two kinds of nonlinear phenomena. The experimental results show that the beat-up phenomenon occurs only when the thermal power is small and the equivalent ratio is relatively low. The hysteresis phenomenon is more pronounced when the equivalence of combustion oscillation is higher than the upper limit, while the equivalence ratio is not obvious near the lower limit. For the flapping phenomenon in combustion oscillation, the flame transfer function (FTF) was obtained by the thermoacoustic coupling analysis and the relationship between dispersion model and acoustic wave propagation. The results provide a reference for further analysis and control of such nonlinear oscillations.