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实验研究了常温常压条件下贫燃预混旋流火焰的燃烧不稳定性.结果表明:不稳定燃烧时,火焰结构发生显著变化,呈现大尺度运动的特点.燃烧室所发生的燃烧不稳定性是纵向自激式振荡,是燃烧室与预混段之间的耦合,振荡频率由整个系统决定.随着当量比的提高,燃烧经历了由稳定到不稳定,并达到有限循环脉动的过程.流动脉动和火焰的相互作用,是激发和维持振荡的主要原因,需要深入研究不稳定燃烧性产生和得以维持的机理.
The combustion instability of lean-burn pre-mixed swirling flame under normal temperature and pressure conditions was experimentally studied.The results show that the structure of flame changes significantly and exhibits the characteristics of large-scale motion when unstable combustion occurs.The instability of combustion in the combustion chamber Sexuality is the longitudinal self-excited oscillation, which is the coupling between the combustion chamber and the premixed section, and the oscillation frequency is determined by the whole system. As the equivalence ratio increases, the combustion undergoes a process from stable to unstable and reaches the limit of cyclic pulsation The interaction between flow pulsation and flame is the main reason for excitation and maintenance of oscillations, and the mechanism of unstable combustion generation and maintenance needs to be further studied.