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首页> 外文会议>燃焼シンポジウム >Unsteady dynamics of flames and pressure fluctuations in a lean-premixed low-swirl combustor during the transient process from stable operation to thermoacoustic instability
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Unsteady dynamics of flames and pressure fluctuations in a lean-premixed low-swirl combustor during the transient process from stable operation to thermoacoustic instability

机译：在瞬态过程中稀薄预混的低旋流燃烧器中的火焰和压力波动的不稳定动态从稳定运行到热声不稳定

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摘要

The unsteady flame dynamics and pressure fluctuations of a low-swirl combustor during a transient process from stable to unstable operation are experimentally investigated.Lean-premixed CH4-and H2-air jet flames with combustor lengths of 300 and 500 mm are investigated using simultaneous 10-kHz OH* chemiluminescence imaging and 200-kHz pressure fluctuation measurements.To induce the transient process,the fuel flow rate is gradually increased from the initial premixed mixture velocity,Vm=15 m/s,while the air flow rate remains constant.Results indicate that the amplitude of pressure fluctuations at a dominant frequency for the thermoacoustic instability |p’(f_(peak))| is higher with the longer combustor for the CH4-air flame,whereas the H2-air flame shows the opposite trend.The flame’s structural and modal characteristics suggest that when |p’(f_(peak))| is higher,CH4-and H2-air flames behave as an Mlike flame.This causes thermoacoustic coupling over relatively wide regions,and thus is attributed to the strong thermoacoustic instability.
机译：在瞬态过程中，从稳定于不稳定操作的瞬态过程中的不稳定火焰动力学和压力波动是通过同时研究进行实验研究的，通过同时研究了具有燃烧器长度为300和500mm的闪闪发热的CH4-and H2-Air射流火焰-KHz OH *化学发光成像和200-kHz压力波动测量。诱导瞬态过程，从初始预混混合速度，VM = 15m / s逐渐增加燃料流量，而空气流速保持不变。结果表明热声稳定性的主频率下压力波动的幅度（F_（峰））|对于CH4 - 空气的燃烧器较长的燃烧器更高，而H2-AIR火焰显示相反的趋势。火焰的结构和模态特性表明，当| P'（F_（峰））|较高，CH 4和H 2 - 空气火焰表现为MLIKE FLAME.THIS导致在相对宽的区域上的热声耦合，因此归因于强的热声不稳定。

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