Experimental investigation on aerodynamic noise of a small-scale multi-blade centrifugal fan

IF 3.4 2区物理与天体物理 Q1 ACOUSTICS

Applied Acoustics Pub Date : 2024-07-27 DOI:10.1016/j.apacoust.2024.110184

Han Chen, Peiran Jiang, Hao Cheng, Pengfei Ma, Yu Liu

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Abstract

In this study, the aerodynamic noise of a small-scale centrifugal fan was experimentally investigated using acoustic testing techniques and time-resolved stereoscopic particle image velocimetry (SPIV). During the acoustic experiments, both far-field noise and near-field pressure fluctuations of the test fan were measured. The overall far-field noise towards the fan inlet side was found to be higher than that of the back side. The pressure fluctuations on the fan upper casing exceeded those on the side wall due to the uncontracted volute tongue, indicating pronounced flow-to-wall interactions. Moreover, based on a simultaneous measurement, the coherence between the near-field pressure fluctuations and far-field noise highlighted the significant contributions of impeller rotation to noise radiation. SPIV measurements uncovered the time-averaged and transient flow fields at the fan's inlet and outlet. The time-averaged results demonstrated the concentrated inlet flow and outlet flow separation, leading to high flow unsteadiness. Transient flow fields displayed an asymmetric jet-wake region characterized by both quasi-steady flow and rotational flow behaviours. The instantaneous flow results were analyzed using the dynamic mode decomposition (DMD) method, which clearly recognized the jet-wake patterns with frequencies corresponding to the rotational frequency. The observed consistency in frequency characteristics among noise, pressure fluctuations, and unsteady flow affirms that flow dynamics are crucial to the primary noise mechanisms.

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小型多叶离心风机空气动力噪声实验研究

本研究利用声学测试技术和时间分辨立体粒子图像测速仪（SPIV）对小型离心风机的空气动力噪声进行了实验研究。在声学实验过程中，测量了测试风机的远场噪声和近场压力波动。结果发现，风扇进风口一侧的整体远场噪声高于风扇背面。由于涡舌没有收缩，风扇上部外壳的压力波动超过了侧壁的压力波动，这表明流动与侧壁之间存在明显的相互作用。此外，基于同步测量，近场压力波动和远场噪声之间的一致性突出表明了叶轮旋转对噪声辐射的重要贡献。SPIV 测量揭示了风机入口和出口处的时均流场和瞬态流场。时间平均结果表明，入口流集中，出口流分离，导致流动高度不稳定。瞬态流场显示了一个非对称的喷射翼区域，其特点是同时存在准稳流和旋转流行为。使用动态模式分解（DMD）方法对瞬时流动结果进行了分析，可以清晰地识别出频率与旋转频率相对应的喷射-晃动模式。观察到噪声、压力波动和非稳态流动的频率特性具有一致性，这证明流动动力学对主要噪声机制至关重要。

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

Applied Acoustics 物理-声学

CiteScore

7.40

自引率

11.80%

发文量

618

审稿时长

7.5 months

期刊介绍： Since its launch in 1968, Applied Acoustics has been publishing high quality research papers providing state-of-the-art coverage of research findings for engineers and scientists involved in applications of acoustics in the widest sense. Applied Acoustics looks not only at recent developments in the understanding of acoustics but also at ways of exploiting that understanding. The Journal aims to encourage the exchange of practical experience through publication and in so doing creates a fund of technological information that can be used for solving related problems. The presentation of information in graphical or tabular form is especially encouraged. If a report of a mathematical development is a necessary part of a paper it is important to ensure that it is there only as an integral part of a practical solution to a problem and is supported by data. Applied Acoustics encourages the exchange of practical experience in the following ways: • Complete Papers • Short Technical Notes • Review Articles; and thereby provides a wealth of technological information that can be used to solve related problems. Manuscripts that address all fields of applications of acoustics ranging from medicine and NDT to the environment and buildings are welcome.