Measurement and Simulation of Combustion Noise and Dynamics of a Confined Swirl Flame
Measurement and Simulation of Combustion Noise and Dynamics of a Confined Swirl Flame
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DOI：
10.2514/1.j056502
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发表时间：
2018-05-01
期刊：
影响因子：
2.5
通讯作者：
Schuller, Thierry
中科院分区：
文献类型：
--
作者：
Merk, Malte;Polifke, Wolfgang;Schuller, Thierry
本文用可压缩反应流的大涡模拟方法预测了受限湍流预混旋流燃烧器的燃烧噪声。将基于特征的状态空间边界条件耦合到大涡模拟，以精确且彼此独立地施加计算域边界处的声反射系数的幅度和相位。耦合方法被证明是准确的和灵活的关于在不同的操作条件下的有限旋流燃烧室的声压谱的估计。预测的声压级及其频谱分布进行比较的测量。优秀的定性和定量的协议，不仅实现了稳定的配置，但也表现出热声不稳定的配置。这表明，流动和火焰动力学是合理的，很好地再现了模拟。
The combustion noise produced by a confined, turbulent, premixed swirl burner is predicted with large-eddy simulation of compressible, reacting flow. Characteristics-based state-space boundary conditions are coupled to the large-eddy simulation to impose precisely and independently from each other magnitude and phase of the acoustic reflection coefficients at the boundaries of the computational domain. The coupling approach proves to be accurate and flexible in regard to the estimation of sound pressure spectra in a confined swirl combustor for different operating conditions. The predicted sound pressure levels and its spectral distributions are compared to measurements. Excellent qualitative and quantitative agreement is achieved not only for a stable configuration but also for configurations that exhibit a thermoacoustic instability. This indicates that the flow and flame dynamics are reasonably well reproduced by the simulations.