LES for the Evaluation of Acoustic Damping of Effusion Plates
LES for the Evaluation of Acoustic Damping of Effusion Plates
复制标题
LES 用于评估渗流板的声阻尼
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
I. Vitale
中科院分区：
文献类型：
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作者：
A. Andreini;C. Bianchini;B. Facchini;A. Peschiulli;I. Vitale
有效冷却衬套通常用于燃气涡轮机燃烧室中以降低壁温，也可有助于减少由于热声不稳定性引起的压力波动的传播。大涡模拟进行精确地模拟流场和受平均偏流的泻流板在外部正弦强迫下的声学响应。尽管现有的低阶计算模型显示出良好的预测能力，但直接验证诸如交错布置、孔倾斜度、掠流的存在和偏流水平等参数的影响是有趣的，其未完全包括在那些模型中。摘要以周期性单孔结构为研究对象，研究了在不同倾角、偏压和掠流条件下的声激励特性。模拟了90°和30°穿孔的偏流马赫数范围为0.05-0.1，掠流范围为0 - 0.08。选择这些条件是为了将声学特性的知识扩展到实际的内衬工作条件。第二个计算成本更高的设置，包括4个30°的倾斜孔，着重于平行板波的阻尼。详细的计算方法，在通用的开放，报告了用于进行这种分析的源非结构化计算流体力学代码OpenFOAM®，以及对从声学计算获得的关于产生的流场和吸收与能量的结果的分析版权所有© 2012 ASME
Effusion cooled liners, commonly used in gas turbine combustion chambers to reduce wall temperature, may also help reducing the propagation of pressure fluctuations due to thermoacoustic instabilities.Large Eddy Simulations were conducted to accurately model the flow field and the acoustic response of effusion plates subject to a mean bias flow under external sinusoidal forcing. Even though existing lower order computational models showed good predicting capabilities, it is interesting to verify directly the influence of those parameters such as the staggered arrangement, the hole inclination, the presence of a grazing flow and the level of bias flow, which are not fully included in those models.A first bi-periodic single hole configuration with normal acoustic forcing was selected to investigate the acousting behavior with varying inclination angle, bias and grazing flow. 90° and 30° perforations were simulated for bias flow Mach number in the range 0.05–0.1 and grazing flow between 0 and 0.08. Those conditions were chosen to expand the knowledge of acoustic properties towards actual liners working conditions. A second more computationally expensive set-up, including 4 inclined holes at 30°, focused on the damping of parallel to the plate waves.Details of the computational methods implemented in the general purpose open-source unstructured CFD code OpenFOAM® exploited to conduct this analysis are reported together with an analysis of the results obtained from the acoustic computations both regarding the flow field generated and the absorption and energy dissipation coefficient.Copyright © 2012 by ASME