Abhishek Kushwaha, Amitesh Roy, Ianko Chterev, Isaac Boxx, R. I. Sujith
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We observe that the correlated structures in the flow velocity, flame surface and heat release rate fields share the same spatial regions during thermoacoustic instability with period-1 oscillations. In the case of period-2 oscillations, the structures from flame surface and heat release rate field are strongly correlated. However, these structures contribute less to the coherent structures of the flow field. Using the temporal coefficients of the dominant POD modes of the flow velocity field, we also observed 1:1 and 2:1 frequency locking behaviour among the time series of acoustic pressure, heat release rate and the temporal coefficients of the first two dominating POD modes of velocity field during the state of period-1 and period-2 oscillations, respectively. 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Using the temporal coefficients of the dominant POD modes of the flow velocity field, we also observed 1:1 and 2:1 frequency locking behaviour among the time series of acoustic pressure, heat release rate and the temporal coefficients of the first two dominating POD modes of velocity field during the state of period-1 and period-2 oscillations, respectively. 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引用次数: 0
摘要
本文采用基于分解技术的框架来研究漩涡火焰中流速与声压和热释放率的同步性。该框架使用扩展的适当正交分解来识别速度场中速度和热释放波动高度相关的区域。我们应用该框架研究了在使用富氢天然气的技术预混、漩涡稳定燃气轮机型模型燃烧器中与周期-1 和周期-2 型热声不稳定性相关的耦合相互作用。我们利用扩展 POD 发现火焰表面结构和热释放率与流场的主要相干结构相关。我们观察到,在具有周期-1 振荡的热声不稳定性期间,流速、火焰表面和热释放率场中的相关结构共享相同的空间区域。在周期-2振荡的情况下,火焰表面和热释放率场的结构具有很强的相关性。然而,这些结构对流场相干结构的贡献较小。利用流速场主要 POD 模式的时间系数,我们还观察到在周期-1 和周期-2 振荡状态下,声压、热释放率和流速场的前两个主要 POD 模式的时间系数的时间序列之间分别存在 1:1 和 2:1 的频率锁定行为。这些频率锁定状态表明了基本的相位同步状态,与流速场中的相干结构相关。
Coupled thermoacoustic interactions in hydrogen-enriched lean combustion
In this paper, we apply a framework based on decomposition techniques to study the synchronization of flow velocity with acoustic pressure and heat release rate in swirl flames. The framework uses the extended proper orthogonal decomposition to identify regions of the velocity field where velocity and heat release fluctuations are highly correlated. We apply this framework to study coupled interactions associated with period-1 and period-2 type thermoacoustic instability in a technically premixed, swirl-stabilized gas turbine-type model combustor operated with hydrogen-enriched natural gas. We find the structures in the flame surface and the heat release rate correlated with the dominant coherent structures of the flow field using extended POD. We observe that the correlated structures in the flow velocity, flame surface and heat release rate fields share the same spatial regions during thermoacoustic instability with period-1 oscillations. In the case of period-2 oscillations, the structures from flame surface and heat release rate field are strongly correlated. However, these structures contribute less to the coherent structures of the flow field. Using the temporal coefficients of the dominant POD modes of the flow velocity field, we also observed 1:1 and 2:1 frequency locking behaviour among the time series of acoustic pressure, heat release rate and the temporal coefficients of the first two dominating POD modes of velocity field during the state of period-1 and period-2 oscillations, respectively. These frequency-locked states, which indicate the underlying phase-synchronization states, correlate with coherent structures in the flow velocity field.
期刊介绍:
Experiments in Fluids examines the advancement, extension, and improvement of new techniques of flow measurement. The journal also publishes contributions that employ existing experimental techniques to gain an understanding of the underlying flow physics in the areas of turbulence, aerodynamics, hydrodynamics, convective heat transfer, combustion, turbomachinery, multi-phase flows, and chemical, biological and geological flows. In addition, readers will find papers that report on investigations combining experimental and analytical/numerical approaches.