Three-dimensional spatial-temporal evolution and dynamics of the tip leakage vortex in an oil–gas multiphase pump

Shu, Zekui; Shi, Guangyuan; Tao, Sijia; Tang, Wanqi; Li, Changxu

doi:10.1063/5.0073634

Cited by 23 publications

(4 citation statements)

References 44 publications

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“…In order to avoid physical touch between the blade and the wall during operation, some radial tip space is required [3], as shown in Figure 1 [4]. Driving by the blade tip pressure difference, tip leakage flow (TLF) occurs [5,6], which has a significant influence on the pump's performance, noise level, and stalling point [7,8].…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of the effect of blade tip loading distribution on tip leakage vortex characteristics in a waterjet pump

Gong,

Zhu,

Chen

et al. 2024

J. Phys.: Conf. Ser.

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The blade tip leakage vortex (TLV) is a common concern for waterjet pump. The TLV are closely related to the load distribution at the blade tip. This paper aims at to investigate the relationship between blade tip load distribution and TLV trajectory and size. The characteristics of tip leakage vortex in a mixed flow pump is investigated by numerical method. The SST k-ω turbulence model is used to predict TLV trajectories. The result shows a good agreement with the visualization results based on high-speed photography (HSP), which validated that the accuracy of numerical method. The numerical results show that the starting point of the TLV, as well as the angle between blade chord and TLV changes with flow rate condition, which related with the blade tip loading. Therefore, the distribution of the load at the top of the leaf necessarily influences the trajectory of the leakage vortex. Comparing the three different loading patterns at the blade tip, it can be seen that as the load moves backwards, the starting position of the leakage vortex at the blade tip moves backwards and the relative angle between the TLV and blade increases.

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Section: Introductionmentioning

confidence: 99%

Numerical investigation of the effect of blade tip loading distribution on tip leakage vortex characteristics in a waterjet pump

Gong,

Zhu,

Chen

et al. 2024

J. Phys.: Conf. Ser.

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“…Feng et al 20 found that tip clearance flow intensified the pressure fluctuation in the entire impeller region, while the pressure fluctuation in the guide vane was almost unaffected. Liu et al 21 and Shu et al 22,23 pointed out through numerical simulation that TLV in multiphase pump included the vortex of the leading edge, the primary TLV, the secondary TLV, and the vortex of trailing edge, and pointed out the internal factors affecting the morphological trajectory and evolution characteristics of leakage vortex. Liu and Tan 24 revealed the vortex dynamic characteristics of TLV in multiphase pumps through the SST model and the vorticity transport equation.…”

Section: Introductionmentioning

confidence: 99%

Dynamic characteristics of the tip leakage vortex in an oil–gas multiphase pump based on vorticity decomposition theory

Shi,

Sun,

Wang

et al. 2024

Energy Science & Engineering

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The paper combines experimental and numerical simulation methods to investigate the tip leakage vortex (TLV) in an oil–gas multiphase pump. The study aims to understand the evolution and dynamic characteristics of the TLV. The vorticity decomposition theory is used to analyze the spatial–temporal evolution, transient behavior, and rigid vorticity of the TLV. The findings reveal that the TLV is formed near the pressure surface when the tip clearance jet passes through the shear layer. In one impeller rotation period, transient fluctuations of the TLV are attributed to pressure differences and velocity changes across the tip clearance, and the TLV undergoes two split–dissipation–recurrence processes within one impeller rotation cycle. The presence of the gas phase enhances the scale and strength of the TLV while prolonging its existence in the flow channel. Analysis based on the rigid vorticity transport equation shows that the growth of the TLV and collapse are primarily governed by the rigid vortex generation term. The Coriolis force term contributes to stabilizing the TLV, while the rigid vorticity stretching term affects its shape. Furthermore, the gas phase significantly increases the value of the Rigid vorticity Curl of pseudo‐Lamb vector Term (RCT), which plays a crucial role in the prolonged existence of the TLV under gas–liquid two‐phase conditions. From an inlet gas void fraction of 0%–20%, the RCT value increases by 4.8 × 106/s2, the entropy production value increases by 75.55%, and the hydraulic efficiency decreases by 16.29%.

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“…By analyzing the relationship between the TLV eddy current intensity and the tip pressure measurement and suction side, it was found that the flow isolation situation at the radial parameter 0.97 increases the turbulent energy dissipation of the pump. Shu et al [9,10] presented a detailed discussion on the leakage vortex structure under different working conditions of multiphase pumps and found that the relative tensile term of the vortex, Coriolis force, and viscous diffusion were the power sources for the changes in TLV vorticity and trajectory. In addition, a quantitative study on TLV energy dissipation in the impeller was applied by applying the quasi-vortex energy dissipation theory, and the highest vorticity was found at the TLV vortex core.…”

Section: Introductionmentioning

confidence: 99%

Study of Tip Clearance on Dynamic and Static Head of a Spiral Axial-Flow Blade Pump under Cavitation Conditions

Wen,

Lv,

Shi

2023

Water

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A spiral axial-flow blade pump (SABP) is an indispensable device in the closed gathering and transporting technology of oil and natural gas exploitation; it can not only transport a gas–liquid mixture with a high gas content, but also transport a gas–liquid–solid mixture containing a small amount of sand. However, due to the large vortices that often appear in the flow channel of the SABP, cavitation is induced extremely easily. This paper presents a numeric calculation of the cavitation performance of an SABP to reveal the law governing the impact of cavitation on its internal flow. The impact of tip clearance with different sizes on the dynamic and static head of the SABP was analyzed, and the change rules of the absolute velocity, relative velocity, and dynamic and static head were revealed under different cavitation stages, too.

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Three-dimensional spatial-temporal evolution and dynamics of the tip leakage vortex in an oil–gas multiphase pump

Cited by 23 publications

References 44 publications

Numerical investigation of the effect of blade tip loading distribution on tip leakage vortex characteristics in a waterjet pump

Numerical investigation of the effect of blade tip loading distribution on tip leakage vortex characteristics in a waterjet pump

Dynamic characteristics of the tip leakage vortex in an oil–gas multiphase pump based on vorticity decomposition theory

Study of Tip Clearance on Dynamic and Static Head of a Spiral Axial-Flow Blade Pump under Cavitation Conditions

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