Synchronization-based model for turbulent thermoacoustic systems
Synchronization-based model for turbulent thermoacoustic systems
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DOI：
10.1007/s11071-023-08368-z
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发表时间：
2022-06
影响因子：
5.6
通讯作者：
Yue Weng;Vishnu R Unni;R. Sujith;A. Saha
中科院分区：
文献类型：
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作者：
Yue Weng;Vishnu R Unni;R. Sujith;A. Saha
我们提出了一个现象学降阶模型来捕捉湍流燃烧室向热声不稳定的过渡。该模型基于同步框架，将声场和湍流反应流的非定常放热率视为两个非线性耦合子系统。为了模拟燃烧噪声，我们使用一对非线性耦合二阶ode来表示非定常放热率。这种简单的结构，当非线性耦合到另一个振荡器时，它代表了燃烧室中声学的独立子系统（压力振荡），能够产生混乱。先前的实验研究已经报道了湍流燃烧室从低振幅混沌振荡（即燃烧噪声）到间歇性周期性振荡的途径。通过改变耦合强度，该模型可以复制观测到的相变路径，反映非定常放热速率和压力振荡相互作用产生的耦合动力学。
We present a phenomenological reduced-order model to capture the transition to thermoacoustic instability in turbulent combustors. Based on the synchronization framework, the model considers the acoustic field and the unsteady heat release rate from turbulent reactive flow as two nonlinearly coupled sub-systems. To model combustion noise, we use a pair of nonlinearly coupled second-order ODEs to represent the unsteady heat release rate. This simple configuration, while nonlinearly coupled to another oscillator that represents the independent sub-system of acoustics (pressure oscillations) in the combustor, is able to produce chaos. Previous experimental studies have reported a route from low amplitude chaotic oscillation (i.e., combustion noise) to periodic oscillation through intermittency in turbulent combustors. By varying the coupling strength, the model can replicate the route of transition observed and reflect the coupled dynamics arising from the interplay of unsteady heat release rate and pressure oscillations.