Sidewall-attached vortex hidden in a pump sump: evolution process and induced pressure oscillation

IF 2.8 2区工程技术 Q2 ENGINEERING, MECHANICAL

Experimental Thermal and Fluid Science Pub Date : 2025-05-14 DOI:10.1016/j.expthermflusci.2025.111524

Bowen Zhang , Lei Ma , Li Cheng , Baoshan Zhu , Heng Zhao , Yonglin Qin

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引用次数: 0

Abstract

In scenarios with a low roof, there is a significant risk of generating rare and concealed sidewall-attached vortices (SAVs) within closed pump sumps. A high-speed visualization experiment was conducted using a transparent circulating hydraulic device with a closed pump sump to capture the spatiotemporal evolution of SAV. High-frequency dynamic pressure sensors were employed to record pressure fluctuations caused by SAVs under various flow conditions. The findings reveal that the evolution of SAVs exhibits three distinct behaviors and structures: right-drift, left-drift, and twin-vortex structure. The scale of the vortex core attached to the sidewall exhibits a characteristic of first expanding, then contracting, and then expanding again with the spatiotemporal evolution of SAV. The pressure drop characteristics due to SAVs exhibit significant differences in pressure fluctuation intensity, with a pressure coefficient amplitude of 3.62 × 10⁻⁵ when vortices are present. Both wavelet packet transform and continuous wavelet spectrum indicate that the induced frequency of SAV is low, with a characteristic frequency of 0.200 Hz. Furthermore, the intensity of pressure fluctuation induced by SAVs increases with higher flow rates. And once the flow rate exceeds 0.7 times the design flow rate, the characteristic low-frequency amplitude induced by SAV exceeds the rotating frequency amplitude and occupies an absolute dominant position.

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泵槽内隐藏的侧壁附涡：演化过程及诱导压力振荡

在低顶板的情况下，在封闭的泵水池内产生罕见且隐蔽的侧壁附著涡（sav）的风险很大。采用带封闭泵池的透明循环液压装置进行了高速可视化实验，以捕捉SAV的时空演变。采用高频动态压力传感器记录不同流量条件下sav引起的压力波动。研究结果表明，sav的演化表现出三种不同的行为和结构：右漂、左漂和双涡结构。附在侧壁上的涡核尺度随着SAV的时空演化呈现先扩张后收缩再扩张的特征。当存在涡时，由sav引起的压降特征在压力波动强度上存在显著差异，压力系数幅值为3.62 × 10−5。小波包变换和连续小波谱表明，SAV的诱发频率较低，特征频率为0.200 Hz。此外，sav引起的压力波动强度随着流量的增加而增加。当流量超过设计流量的0.7倍时，SAV诱发的特征低频幅值超过旋转频率幅值，占据绝对主导地位。

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

Experimental Thermal and Fluid Science 工程技术-工程：机械

CiteScore

6.70

自引率

3.10%

发文量

159

审稿时长

34 days

期刊介绍： Experimental Thermal and Fluid Science provides a forum for research emphasizing experimental work that enhances fundamental understanding of heat transfer, thermodynamics, and fluid mechanics. In addition to the principal areas of research, the journal covers research results in related fields, including combined heat and mass transfer, flows with phase transition, micro- and nano-scale systems, multiphase flow, combustion, radiative transfer, porous media, cryogenics, turbulence, and novel experimental techniques.