论文标题
基于同步的湍流热声系统模型
Synchronization based model for turbulent thermoacoustic systems
论文作者
论文摘要
我们提出了一个现象学降低的模型，以捕获湍流燃烧器中的热声不稳定性的过渡。该模型基于同步的框架，并将其视为两个非线性耦合子系系统的声场和不稳定的热量释放速率。先前的实验研究报告了从低振幅混沌振荡（即燃烧噪声）到周期性振荡的途径，通过湍流燃烧器的间歇性。通过改变耦合强度，我们提出的模型可以复制实验中观察到的途径。该模型没有将燃烧噪声作为背景噪声评估为背景噪声，而是考虑了一种耦合的振荡器系统，该振荡器系统会产生多重混沌振荡以表示燃烧噪声。然后将这组耦合振荡器非线性耦合到代表声场的线性振荡器。随着耦合强度的提高，该系统将失去其多重纹理，并以与实验研究中观察到的动力学相一致的方式表现出大幅度的周期性振荡。
We present a phenomenological reduced-order model to capture the transition to thermoacoustic instability in turbulent combustors. The model is based on the framework of synchronization and considers the acoustic field and the unsteady heat release rate from turbulent reactive flow as two nonlinearly coupled sub-systems. Previous experimental studies have reported a route from low amplitude chaotic oscillation (i. e. combustion noise) to periodic oscillations through intermittency in turbulent combustors. By varying the coupling strength, our proposed model can replicate the route that is observed in experiments. Instead of assessing combustion noise as background noise to the system, the model considered a coupled oscillator system that produces multifractal chaotic oscillations to represent the combustion noise. This set of coupled oscillators is then nonlinearly coupled to a linear oscillator representing the acoustic field. As the coupling strength increases, the system loses its multifractality and exhibits large-amplitude periodic oscillations in a manner consistent with the dynamics observed in experimental studies.
