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首页> 外文期刊>Applied thermal engineering: Design, processes, equipment, economics >Numerical analysis for attenuation effects of perforated plates on thermoacoustic instability in the multiple flame combustor
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Numerical analysis for attenuation effects of perforated plates on thermoacoustic instability in the multiple flame combustor

机译：穿孔板对多火焰燃烧器热声不稳定性衰减效应的数值分析

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In the present study, the FDF-based approach together with the Helmholtz solver has been applied to precisely analyze the attenuation effects of the perforated plates on thermoacoustic instability in the lab scale multiple flame combustor. In order to effectively suppress the combustion instability, we derive the optimal damping conditions for perforated plates in terms of the porosity and cavity length. To overcome the weaknesses of the Howe model, the Luong model is utilized for an impedance boundary condition of perforated plates. After then, we validated our methodology to the impedance tube, which shows the predicted results are well agreed with the experimental data for all validation cases Another new approach for the dual perforated plates has been proposed to enlarge the absorption bandwidth in a wider frequency regime. Numerical results clearly indicate that since the dual plates are tuned at two different target frequencies, the system can have two maximum absorption points and their combined effects in a frequency range. This makes the dual-plate method capable of stabilizing the combustion instability in the much wider frequency range than does the single-plate scheme. Therefore, it is expected that the dual-plate methodology would be more effective to suppress the unexpected nonlinear behavior such as the mode change, frequency shift, and hysteresis thanks to the wide attenuation coverage. (C) 2017 Elsevier Ltd. All rights reserved.
机译：在本研究中，已经应用了基于FDF的方法与Helmholtz求解器一起，精确地分析了穿孔板在实验室规模多火焰燃烧器中热声不稳定的衰减效果。为了有效地抑制燃烧不稳定性，我们在孔隙率和腔长的方面获得了穿孔板的最佳阻尼条件。为了克服HOWE模型的弱点，鲁勇模型用于穿孔板的阻抗边界条件。然后，我们经过向阻抗管验证了我们的方法，该方法显示了预测结果与所有验证情况的实验数据很好地同意，已经提出了双穿孔板的另一种新方法以扩大更广泛的频率制度的吸收带宽。数值结果清楚地表明，由于双板在两个不同的目标频率下调谐，因此系统可以具有两个最大吸收点及其在频率范围内的组合效果。这使得能够在更宽的频率范围内稳定燃烧不稳定性的双板方法而不是单板方案。因此，由于广泛的衰减覆盖，预计双板方法将更有效地抑制意外的非线性行为，例如模式变化，频移和滞后。 （c）2017 Elsevier Ltd.保留所有权利。

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