Experimental investigation on thermoacoustic oscillation of a new dual-swirl combustor
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摘要: 对一新型双旋流燃烧室开展了实验测量，研究了燃烧状态参数2种变化过程对火焰热声振荡特性的影响（过程1：保持甲烷体积流量不变，当量比从0.900逐步减小至0.725再逐步增大至0.925；过程2：保持当量比为0.850不变，逐步增大预混气的体积流量）。结果表明：在该燃烧室中存在M型和V型2种火焰结构；在过程1中，随着当量比减小，火焰由不稳定的M型转变为稳定的V型，其后，随着当量比增大，又逐渐转变为M型，存在明显的滞环现象；在过程2中，仅在初始流量下存在明显的热声振荡现象，随着流量增大，火焰变得稳定；基于压力脉动信号的功率谱特性分析和相空间重构分析，发现该双旋流燃烧室内热声振荡主频率分布于400.0和256.0 Hz左右。Abstract: In this paper, a new type of dual-swirl combustor is tested. The effects of two varying processes of combustion state parameters on the thermoacoustic oscillation characteristics of flame are studied. The two processes are: keep methane volume flow rate constant and reduce the equivalence ratio from 0.900 to 0.725 and then increase it back to 0.925; keep the equivalence ratio constant as 0.850 and increase the premixed gas volume flow. The results show that there are two distinct flame patterns of M-shaped and V-shaped in this combustor. In process 1, the flame changes from unstable M-shaped flame to stable V-shaped flame with decreaseing equivalence ratio, and then changes to M-shaped flame with increaseing equivalence ratio, the combustor exists hysteresis phenomenon; In process 2, Thermoacoustic oscillation is only found at the initial flow rate, and the flame becomes stable with increaseing flow rate.Through the analysis of the power spectrum characteristics and phase space reconstruction of the pressure fluctuation signal, it is found that there are unstable frequencies around 400.0 and 256.0 Hz in this dual-swirl combustor.
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图 4 不同当量比下火焰结构变化及压力脉动幅值
Figure 4. Structural change of flame and pressure pulsation amplitude at different equivalence ratios
图 7 ϕ=0.850时内管体积流量变化下的功率谱图
Figure 7. Power spectrum of inner pipe with volume flow rate change at ϕ=0.850
图 9 当量比减小过程的相空间重构图
Figure 9. Phase space reconstruction graph with equivalent ratio decreases
图 10 当量比增大过程的相空间重构图
Figure 10. Phase space reconstruction graph with equivalent ratio increases
图 11 ϕ=0.850时内管体积流量变化下的相空间重构图
Figure 11. Phase space reconstruction of inner pipe with volume flow rate change at ϕ=0.850
表 1 Case A~H对应的当量比
Table 1. Equivalent ratio corresponding to Case A~H
Case 当量比ϕ(减小) Case 当量比ϕ(增大) A 0.900 E 0.800 B 0.850 F 0.850 C 0.800 G 0.900 D 0.725 H 0.925 
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表 2 Case I-L对应的内外管体积流量
Table 2. The Volume flow rate of inner and outer pipes corresponding to Case I-L
Case 外管流量/(L·min-1) 内管流量/(L·min-1) Vf1 Va1 Vf2 Va2 I 4.0 45.0 0.8 9.0 J 4.0 45.0 2.8 31.0 K 4.0 45.0 4.8 53.0 L 4.0 45.0 5.5 62.0
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表 3 各工况下的热声振荡特性及火焰结构
Table 3. Thermoacoustic oscillation characteristics and flame structure under corresponding working conditions
Case 主频率/Hz 声压级/dB 稳定性 火焰结构 I 256.0 51.59 热声振荡 V型 J 260.0 30.02 稳定 V型 K 260.5 22.79 稳定 V型 L 411.0 38.02 类似不稳定 V型
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