Examination on behavior of tip leakage flow in a three-stage gas-liquid two-phase flow pump

IF 2.5 3区工程技术

Journal of Hydrodynamics Pub Date : 2024-11-08 DOI:10.1007/s42241-024-0063-1

Si-na Yan, Xing-qi Luo, Jian-jun Feng, Shuai-hui Sun, Guo-jun Zhu, Xin Wu

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Abstract

Tip leakage flow (TLF) trajectory in a pump with gas entrainment is investigated via visualization experiments and numerical simulations. Starting position of tip leakage vortex (TLV) is determined accurately by numerical simulation. Under high liquid flow rate (Q_l) and high inlet gas volume fraction (IGVF) conditions, TLF flows from suction surface to pressure surface near the leading edge of blade, and the direction of TLF gradually changes along the chord which flows from pressure surface to suction surface near the tailing edge. The angle between TLF and blade mean camberline increases progressively as either Q_l or IGVF decreases, and starting position of TLV moves towards leading edge direction. As Q_l or IGVF decreases, value of vorticity increases and high vorticity region moves towards leading edge. The entropy production rate at blade tip clearance is high, and entropy diffuses from pressure surface to suction surface due to jet flow in blade tip clearance. The greater the amount of accumulated gas there is, the greater the amount of entropy in the area. In addition, when gas is entrained in pump, there are many low frequency fluctuations generated in blade tip clearance.

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三级气液两相流泵叶尖泄漏流动特性的研究

采用可视化实验和数值模拟相结合的方法研究了含气泵的叶尖泄漏流动轨迹。通过数值模拟准确地确定了叶尖泄漏涡的起始位置。在高液体流量（Ql）和高进口气体体积分数（IGVF）条件下，TLF从吸力面流向叶片前缘附近的压力面，沿从压力面流向尾缘附近吸力面的弦线方向逐渐改变。随着Ql和IGVF的减小，TLF与叶片平均凸轮线夹角逐渐增大，TLV起始位置向前缘方向移动。随着Ql或IGVF的减小，涡度值增大，高涡度区向前缘移动。叶尖间隙处的熵产率较高，由于叶尖间隙内的射流，熵从压力面向吸力面扩散。积聚的气体越多，该区域的熵就越大。此外，当气体在泵内夹带时，叶尖间隙会产生许多低频波动。

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来源期刊

Journal of Hydrodynamics MECHANICS-

自引率

12.00%

发文量

2374

审稿时长

4.6 months

期刊介绍： Journal of Hydrodynamics is devoted to the publication of original theoretical, computational and experimental contributions to the all aspects of hydrodynamics. It covers advances in the naval architecture and ocean engineering, marine and ocean engineering, environmental engineering, water conservancy and hydropower engineering, energy exploration, chemical engineering, biological and biomedical engineering etc.