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Experimental analysis of two-period quasi-periodic oscillations in a turbulent hydrogen combustor

机译：湍流氢燃烧器中两时间周周期振荡的实验分析

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摘要

The thermo-acoustic instability behavior of non-premixed hydrogen combustion is analyzed in the present work with the inlet Reynolds number, Re as the control parameter. It is observed that the dominant frequency (mode) shifts from the fundamental duct-acoustic mode to the first harmonic, as Re is varied. Continuous wavelet transform of the pressure oscillations reveals that at different Re, the dynamical nature of oscillations is topologically different, although they have identical spectral content. An interesting dynamical behavior identified as two-period quasi-periodic oscillations is observed, which has not been reported in prior literature. The state is seen to be unstable to incremental changes in Re and transitioning to limit cycle oscillations subsequently. Further diagnosis employing time-resolved OH* chemiluminescence and particle image velocimetry reveals the amplitude modulation of the quasi-periodic oscillation as a result of staggered vorticity distribution across the bluff body which results in asymmetric heat release rate distribution. A general framework for such oscillations is then applied, leading to identifying specific conditions that need to be satisfied to enable the existence of these oscillations. This study leads to novel observations on the asymmetric nature of shear layers, which can result in hitherto observed dynamical states.
机译：在与入口雷诺数的本作合作中，将非预混氢燃烧的热声不稳定行为进行分析，作为控制参数。观察到主导频率（模式）从基本管道 - 声模式转移到第一谐波，因为RE改变。压力振荡的连续小波变换表明，在不同的RE中，振荡的动态性质在拓扑上不同，尽管它们具有相同的光谱含量。观察到被鉴定为两时间周期振荡的有趣的动态行为，尚未在现有文献中报告。该状态被认为是不稳定的，以增加RE和转换以随后限制周期振荡的增量变化。采用时间分辨OH *化学发光和粒子图像速度的进一步诊断显示了由于凹槽体穿过凹痕体的交错涡度分布而产生的准周期性振荡的幅度调制，这导致不对称的热释放率分布。然后应用这种振荡的一般框架，导致识别需要满足能够实现这些振荡的特定条件。该研究导致对剪切层的不对称性质的新颖观察，这可能导致迄今为止观察到的动态状态。

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