罐环燃烧室串扰孔径的固有气动声学不稳定性

IF 4.9 2区 工程技术 Q1 ACOUSTICS
Audrey Blondé, Khushboo Pandey, Bruno Schuermans, Nicolas Noiray
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引用次数: 0

摘要

本文对现代重型燃气轮机相邻燃烧室界面气动声学不稳定性进行了实验和数值研究。一个简化的实验室尺度的间隙分离这些室的出口,只是上游的涡轮进口在can-环形燃烧室结构,被考虑。它由两个通道组成,分别在上游和下游具有消声和阻塞条件。就在代表涡轮入口的阻塞流叶片之前,一个小孔径导致通道之间的气动声学串扰。定义了尺寸和流动条件,以便再现燃气轮机的相关马赫数、斯特劳哈数和亥姆霍兹数。叶片相对于串扰孔径的对准是变化的。在某些条件下可以观察到强烈的口哨声。振荡频率取决于孔径面积,并与基于孔径长度的斯特罗哈尔数成比例。各通道的上游消声条件表明,没有纵向声模参与这种啸叫的机制,这与这种固有气声不稳定性的Strouhal标度一致。结果表明,孔径上游边缘的几何形状是影响啸声发生和强度的重要因素。对该结构进行了可压缩大涡模拟,显著再现了呼啸现象。对数值结果的详细研究揭示了串扰孔径中剪切层振荡产生声音的区域。这项工作有助于理解在罐环燃烧室串扰孔处的气动声学不稳定性。这将有助于设计燃烧器-涡轮界面来抑制它们,这一点很重要,因为它们引起的振动可能与热声不稳定引起的振动一样具有破坏性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Intrinsic aeroacoustic instabilities in the crosstalk apertures of can-annular combustors
This paper presents an experimental and numerical study of aeroacoustic instabilities at the interface between neighbouring combustion chambers in modern heavy-duty gas turbines. A simplified laboratory-scale geometry of the gap separating the outlet of these chambers, just upstream of the turbine inlet in can-annular combustor architectures, is considered. It consists of two channels with anechoic and choked conditions on the upstream and downstream sides, respectively. Right before the choked-flow vanes which represent the turbine inlet, a small aperture leads to an aeroacoustic crosstalk between the channels. The dimensions and flow conditions are defined such that relevant Mach, Strouhal and Helmholtz numbers of gas turbines are reproduced. The alignment of the vanes with respect to the crosstalk aperture is varied. An intense whistling is observed for some conditions. The oscillation frequency depends on the aperture area and scales with the Strouhal number based on the aperture length. The upstream anechoic condition in each channel implies that no longitudinal acoustic mode participates to the mechanism of this whistling, which is in agreement with the Strouhal scaling of this intrinsic aeroacoustic instability. It is shown that the geometry of the upstream edge of the aperture is an essential element in the occurrence and intensity of the whistling. Compressible Large Eddy Simulations of the configuration have been performed and remarkably reproduce the whistling phenomenon. A detailed investigation of the numerical results revealed the region of sound production from the shear layer oscillations in the crosstalk aperture. This work contributes to the understanding of aeroacoustic instabilities at the crosstalk apertures of can-annular combustors. It will help designing combustor–turbine interfaces to suppress them, which is important since the vibrations they induce may be as damaging as those from thermoacoustic instabilities.
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来源期刊
Journal of Sound and Vibration
Journal of Sound and Vibration 工程技术-工程:机械
CiteScore
9.10
自引率
10.60%
发文量
551
审稿时长
69 days
期刊介绍: The Journal of Sound and Vibration (JSV) is an independent journal devoted to the prompt publication of original papers, both theoretical and experimental, that provide new information on any aspect of sound or vibration. There is an emphasis on fundamental work that has potential for practical application. JSV was founded and operates on the premise that the subject of sound and vibration requires a journal that publishes papers of a high technical standard across the various subdisciplines, thus facilitating awareness of techniques and discoveries in one area that may be applicable in others.
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