Noise Mechanisms of an Axial Turbine Stage Based on Large Eddy Simulation

IF 2 3区工程技术 Q3 MECHANICS

Flow, Turbulence and Combustion Pub Date : 2024-04-30 DOI:10.1007/s10494-024-00547-1

Lanyi Yan, Yigang Luan, Daniele Simoni, Tao Sun, Lianfeng Yang, Pietro Zunino, Franco Magagnato

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Abstract

This paper aims at identifying the noise sources in an axial turbine stage and their relative importance. The Large eddy simulation (LES) has been carried out on a geometry containing single rotor and stator passages and the mesh of the rotor domain is circumferentially sliding. The proper orthogonal decomposition (POD) is applied to data matrices constructed with the pressure fields in order to distinctly extract the coherent structures responsible for noise generation. The results show that the rotor–stator interaction contributes up to 50% of the total sound energy, the flow fluctuations are influenced by the rotor–stator interaction even in the very upstream region of the stator passage due to the massive pressure wave reflections between the stator vane row and the rotor blade row. Therefore, the tonal noise at the blade passing frequency and its second harmonic frequency are the dominant noise of the turbine stage. An aerodynamic-acoustic feedback loop is observed in the stator passage and it is mainly due to the emission, reflection and interference of the pressure waves generated by the trailing edge vortex shedding. The surface pressure levels of the rotor blade surface are lower than those of the stator vane surface, thus the rotor blades have a smaller contribution to the overall noise level of the turbine stage than the stator vanes, since there is no aerodynamic-acoustic feedback loop in the rotor passage.

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基于大涡流模拟的轴流涡轮级噪声机理

本文旨在确定轴流式涡轮级中的噪声源及其相对重要性。大涡流模拟（LES）是在包含单转子和定子通道的几何体上进行的，转子域的网格是圆周滑动的。适当的正交分解（POD）被应用于用压力场构建的数据矩阵，以明确提取产生噪声的相干结构。结果表明，转子-定子相互作用产生的声能占总声能的 50%，由于定子叶片排和转子叶片排之间存在大量压力波反射，即使在定子通道的上游区域，流动波动也会受到转子-定子相互作用的影响。因此，叶片通过频率及其二次谐波频率的音调噪声是涡轮级的主要噪声。在定子通道中可以观察到空气动力-声反馈回路，这主要是由于后缘涡流脱落产生的压力波的发射、反射和干扰造成的。转子叶片表面的压力水平低于定子叶片表面的压力水平，因此转子叶片对涡轮级整体噪声水平的贡献小于定子叶片，因为转子通道中不存在空气动力-声反馈回路。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Flow, Turbulence and Combustion 工程技术-力学

CiteScore

5.70

自引率

8.30%

发文量

审稿时长

2 months

期刊介绍： Flow, Turbulence and Combustion provides a global forum for the publication of original and innovative research results that contribute to the solution of fundamental and applied problems encountered in single-phase, multi-phase and reacting flows, in both idealized and real systems. The scope of coverage encompasses topics in fluid dynamics, scalar transport, multi-physics interactions and flow control. From time to time the journal publishes Special or Theme Issues featuring invited articles. Contributions may report research that falls within the broad spectrum of analytical, computational and experimental methods. This includes research conducted in academia, industry and a variety of environmental and geophysical sectors. Turbulence, transition and associated phenomena are expected to play a significant role in the majority of studies reported, although non-turbulent flows, typical of those in micro-devices, would be regarded as falling within the scope covered. The emphasis is on originality, timeliness, quality and thematic fit, as exemplified by the title of the journal and the qualifications described above. Relevance to real-world problems and industrial applications are regarded as strengths.