The Influence of Pre-Lift Gate Opening on the Internal and External Flow Characteristics During the Startup Process of an Axial Flow Pump

IF 2.8 4区工程技术 Q2 ENGINEERING, CHEMICAL

Processes Pub Date : 2024-09-14 DOI:10.3390/pr12091984

You Fu, Lingling Deng

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引用次数: 0

Abstract

This paper focuses on a vertical axial flow pump and employs a 1D-3D coupling method to investigate the effects of different gate pre-opening angles on the internal and external flow characteristics of the axial flow pump during startup. Through comparative analysis, the following conclusions are drawn: In the study, a fully open gate is defined as 1, while a fully closed gate is defined as 0. When starting the axial flow pump with different valve pre-opening degrees, backflow occurs within the first 20 s of startup, and the backflow rate inside the pump gradually increases with the increase in the valve pre-opening degree. At a valve pre-opening degree of 0.6, the maximum backflow rate inside the pump reaches 5.89% of the rated flow rate. When starting the pump with the valve fully open, the maximum backflow rate reaches 10.98% of the rated flow rate, and the efficiency is affected by the backflow rate. The valve pre-opening degree has little impact on the axial force acting on the impeller during startup. When starting with a valve pre-opening degree of 0.6, the internal pressure difference in the pump is minimized. Within the first 20 s of startup, the internal pressure difference in the impeller is 28.96% higher and the flow velocity is 14.62% higher with valve pre-opening degrees of 0.8 and 1.0 compared to a 0.6 degree opening. During the initial stage of pump startup, with valve pre-opening degrees of 0.8 and 1.0, the pressure fluctuation amplitude inside the pump is minimal, with maximum relative amplitudes of only 0.621 and 0.525, which are 41.00% and 28.51% lower than the maximum amplitudes at 0 and 0.2 degrees, respectively. In summary, the peak pressure inside the pump is minimized when the valve pre-opening degree is around 0.8, while the pressure difference and flow velocity are relatively lower at a pre-opening degree of 0.6. It is recommended to start the pump with a valve pre-opening degree of around 0.6 to 0.8.

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轴流泵启动过程中预提升闸门开度对内外流量特性的影响

本文以立式轴流泵为研究对象，采用一维三维耦合方法研究了不同闸门预开角度对轴流泵启动时内外流量特性的影响。通过对比分析，得出以下结论：在研究中，全开的闸门定义为 1，全闭的闸门定义为 0。当启动不同阀门预开度的轴流泵时，在启动的前 20 秒内会出现回流，并且泵内的回流率随着阀门预开度的增加而逐渐增大。当阀门预开度为 0.6 时，泵内的最大回流率达到额定流量的 5.89%。在阀门全开的情况下启动泵，最大回流率达到额定流量的 10.98%，效率受到回流率的影响。阀门预开度对启动时作用在叶轮上的轴向力影响很小。当阀门预开度为 0.6 时，泵内压差最小。在启动的最初 20 秒内，阀门预开度为 0.8 和 1.0 时，叶轮的内部压差比 0.6 开度时高出 28.96%，流速高出 14.62%。在泵启动的初始阶段，阀门预开度为 0.8 度和 1.0 度时，泵内压力波动振幅很小，最大相对振幅仅为 0.621 和 0.525，分别比 0 度和 0.2 度时的最大振幅低 41.00% 和 28.51%。总之，当阀门预开度在 0.8 左右时，泵内的峰值压力最小，而当阀门预开度为 0.6 时，压差和流速相对较低。建议在阀门预开度约为 0.6 至 0.8 时启动泵。

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

Processes Chemical Engineering-Bioengineering

CiteScore

5.10

自引率

11.40%

发文量

2239

审稿时长

14.11 days

期刊介绍： Processes (ISSN 2227-9717) provides an advanced forum for process related research in chemistry, biology and allied engineering fields. The journal publishes regular research papers, communications, letters, short notes and reviews. Our aim is to encourage researchers to publish their experimental, theoretical and computational results in as much detail as necessary. There is no restriction on paper length or number of figures and tables.