Experimental and Numerical Investigations of the Noise Induced by Cavitation in a Centrifugal Pump

IF 1.5 4区工程技术 Q3 ENGINEERING, MECHANICAL

Iranian Journal of Science and Technology-Transactions of Mechanical Engineering Pub Date : 2024-02-01 DOI:10.1007/s40997-023-00749-4

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引用次数: 0

Abstract

The noise induced by cavitation in a centrifugal pump is investigated by collecting the noise of the centrifugal pump under different available net positive suction heads (NPSHa) in the rated flow through experiments. Experimental results are combined with numerical calculations to establish the relationship between cavitation degrees and noise. Firstly, the collected noise signal is denoised using the independent component analysis (ICA) method, and combined with time domain, Fast Fourier transform (FFT), wavelet transform (WT), and spectral proper orthogonal decomposition (SPOD) methods to analyse the characteristics of cavitation noise signal after noise reduction. After being denoised by ICA, the noise signal can effectively reflect the inception and development of cavitation. In the frequency domain, the typical frequency band of noise induced by cavitation is 2 ~ 8 kHz. During severe cavitation, the amplitude of the shaft and blade frequency in the low-frequency band (0 ~ 600 Hz) gradually decreases until they become low-frequency broadband signals. In the time–frequency domain, when cavitation develops to an unstable cavitation state, the 0 ~ 1 kHz noise amplitude fluctuates irregularly. Finally, the coherent structure of cavitation noise feature signals is established using the SPOD method. Higher-order modes 3 and 4 can capture the characteristic changes of the centrifugal pump cavitation noise at different NPSHa.

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离心泵气蚀噪声的实验和数值研究

摘要通过实验收集了离心泵在额定流量下不同可用净正吸入压头（NPSHa）条件下的噪声，从而研究了离心泵中气蚀引起的噪声。实验结果与数值计算相结合，确定了气蚀度与噪声之间的关系。首先，利用独立分量分析（ICA）方法对采集到的噪声信号进行去噪处理，并结合时域、快速傅里叶变换（FFT）、小波变换（WT）和频谱正交分解（SPOD）方法分析降噪后的气蚀噪声信号的特征。经 ICA 去噪后的噪声信号能有效反映空化的萌发和发展过程。在频域上，气蚀噪声的典型频带为 2 ~ 8 kHz。在严重气蚀过程中，轴和叶片频率在低频段（0 ~ 600 Hz）的振幅逐渐减小，直至成为低频宽带信号。在时频域，当气蚀发展到不稳定气蚀状态时，0 ~ 1 kHz 噪声振幅会出现不规则波动。最后，利用 SPOD 方法确定了空化噪声特征信号的相干结构。高阶模式 3 和 4 可以捕捉不同 NPSHa 下离心泵空化噪声的特征变化。

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

Iranian Journal of Science and Technology-Transactions of Mechanical Engineering ENGINEERING, MECHANICAL-

CiteScore

2.90

自引率

7.70%

发文量

审稿时长

>12 weeks

期刊介绍： Transactions of Mechanical Engineering is to foster the growth of scientific research in all branches of mechanical engineering and its related grounds and to provide a medium by means of which the fruits of these researches may be brought to the attentionof the world’s scientific communities. The journal has the focus on the frontier topics in the theoretical, mathematical, numerical, experimental and scientific developments in mechanical engineering as well as applications of established techniques to new domains in various mechanical engineering disciplines such as: Solid Mechanics, Kinematics, Dynamics Vibration and Control, Fluids Mechanics, Thermodynamics and Heat Transfer, Energy and Environment, Computational Mechanics, Bio Micro and Nano Mechanics and Design and Materials Engineering & Manufacturing. The editors will welcome papers from all professors and researchers from universities, research centers, organizations, companies and industries from all over the world in the hope that this will advance the scientific standards of the journal and provide a channel of communication between Iranian Scholars and their colleague in other parts of the world.