理想膨胀圆形撞击射流中的音调和逆流波

IF 2.5 3区 物理与天体物理 Q2 PHYSICS, FLUIDS & PLASMAS Physical Review Fluids Pub Date : 2024-08-21 DOI:10.1103/physrevfluids.9.083904
Igor A. Maia, Maxime Fiore, Romain Gojon
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引用次数: 0

摘要

我们研究了理想膨胀圆形射流撞击平板产生的音调。我们对不同喷嘴到平板距离的大涡流模拟数据进行了探讨,并考虑了通过导引射流模式产生音调的气声反馈回路的闭合问题。我们使用两种不同的模型计算了共振的允许频率范围,其基础是具有上游定向群速度的模式的存在:一种是圆柱形涡流片模型,另一种是考虑了有限厚度速度剖面的局部平行稳定性模型。结果表明,加入与板附近平均流一致的有限厚度速度剖面,可以改善观测到的声调与模型预测之间的一致性。数据中发现的最大音调的频率位于或非常接近有限厚度模型的频率极限,从而纠正了涡片模型中观察到的差异。在与文献中收集的实验数据和数值数据进行比较时,也发现了同样的趋势。稳定模型的压力特征函数与从音调频率数据中得到的上游游动扰动非常吻合。这进一步证明了共振机制中存在导向喷射模式。
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Tones and upstream-traveling waves in ideally expanded round impinging jets
We study the generation of tones by ideally expanded round jets impinging on a flat plate. Data from large-eddy simulations performed for different nozzle-to-plate distances are explored, and we consider closure of the aeroacoustic feedback loop responsible for the tones by guided jet modes. Allowable frequency ranges for resonance, underpinned by the existence of modes with upstream-directed group velocities, are computed using two different models: a cylindrical vortex-sheet model, and a locally parallel stability model which considers a finite-thickness velocity profile. It is shown that inclusion of a finite-thickness velocity profile consistent with the mean flow in the vicinity of the plate improves the agreement between observed tones and model predictions. The frequencies of the largest tones found in the data are found to fall within, or very close to, the frequency limits of the finite-thickness model, correcting discrepancies observed with the vortex-sheet model. The same trend is observed in comparisons with experimental and numerical data gathered from the literature. Pressure eigenfunctions of the stability model are in good agreement with upstream-traveling disturbances educed from the data at the tone frequencies. This provides further evidence for the involvement of guided jet modes in the resonance mechanism.
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来源期刊
Physical Review Fluids
Physical Review Fluids Chemical Engineering-Fluid Flow and Transfer Processes
CiteScore
5.10
自引率
11.10%
发文量
488
期刊介绍: Physical Review Fluids is APS’s newest online-only journal dedicated to publishing innovative research that will significantly advance the fundamental understanding of fluid dynamics. Physical Review Fluids expands the scope of the APS journals to include additional areas of fluid dynamics research, complements the existing Physical Review collection, and maintains the same quality and reputation that authors and subscribers expect from APS. The journal is published with the endorsement of the APS Division of Fluid Dynamics.
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