Pressure fluctuation and flow pattern of a mixed-flow pump under design and off-design conditions

Xu, Ye; Tan, Lei; Liu, Yabin; Hao, Yong Ping; Zhu, Baoshan; Cao, Shuai

doi:10.1177/0954406217721258

Cited by 15 publications

(7 citation statements)

References 20 publications

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“…The standard pump section equipped with the bidirectional pump hydraulic model was tested on the test bench, including energy characteristics experiment and pressure pulsation characteristics experiment. During the test, strict reference was made to 'water pump model and device model acceptance test procedures' (SL 140-2006) requirements [27][28][29]. The high-precision hydraulic mechanical test bench is a large vertical sealing system.…”

Section: Experimental Test Systemmentioning

confidence: 99%

Experimental Study on the Internal Pressure Pulsation Characteristics of a Bidirectional Axial Flow Pump Operating in Forward and Reverse Directions

et al. 2022

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A bidirectional axial flow pump can realize bidirectional pumping, which has a wide application prospect in coastal low-head pumping stations and water jet propulsion systems. In this paper, a typical bidirectional axial flow pump is taken as the research object, and the hydraulic model of the bidirectional axial flow pump is manufactured. The hydrodynamic characteristics of the bidirectional axial flow pump are tested on the high-precision hydraulic mechanical test bench, including the positive and negative directions. In the experiment, multiple pressure pulsation monitoring points were arranged in the impeller chamber, and the pressure fluctuations in the pump under a total of 42 flow conditions were measured by a micro pressure pulsation sensor, involving 21 working conditions of forward operation and 21 working conditions of reverse operation. According to the experimental results, the hydrodynamic characteristics, especially the pressure pulsation characteristics in the pump, of the two-way axial flow pump under positive and negative operation are comprehensively compared and analyzed, and the energy characteristics and the propagation law of pressure pulsation of the two-way axial flow pump under positive and negative operation are revealed. The research results provide an important reference for the safe and stable operation of coastal bidirectional axial flow pump stations.

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Section: Experimental Test Systemmentioning

confidence: 99%

Experimental Study on the Internal Pressure Pulsation Characteristics of a Bidirectional Axial Flow Pump Operating in Forward and Reverse Directions

et al. 2022

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“…For example, Liu [6] and Han [7] numerically studied the tip leakage flow characteristics in a mixed-flow pump as a turbine, which provides a reference for the design of the tip clearance size. Li [8], Xu [9], and Ji [10] numerically predicted the distribution characteristics of external characteristic parameters and the internal flow fields of mixed flow pumps under a startup transition process, offdesign condition, and a saddle zone, respectively. The calculated results have important engineering value for the safe operation of mixed flow pumps under unstable conditions.…”

Section: Introductionmentioning

confidence: 99%

The Influence of a Pumping Chamber on Hydraulic Losses in a Mixed-Flow Pump

et al. 2022

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In this study, entropy generation theory based on computational fluid dynamics (CFD) is used to study the influence of a pumping chamber type (guide vane and volute scheme) on the spatial distribution of hydraulic loss in a mixed-flow pump. The CFD data of the mixed-flow pump with a volute is validated by external characteristic test data under Q = 561.4–1598.6 m3/h. The results show that the efficiency and the head of the guide vanes scheme are lower under Q = 800–1200 m3/h, which resulted from a higher total entropy production (TEP) in the pumping chamber and outlet pipe. The high total entropy production rate (TEPR) inside the guide vanes can be found near the leading edge of the hub side and trailing edge of the rim side due to flow separation, which reduces the recovery efficiency of kinetic energy of the guide vanes. The high TEPR inside outlet pipe can be seen near the inlet, caused by back flow. However, the efficiency and head of the volute scheme are lower, under Q = 1200–1600 m3/h, owing to the fact that the volute cannot effectively convert kinetic energy into pressure energy and thus the high TEPR can be found near outlet of volute and inlet of outlet pipe. These results can provide useful suggestions to the matching optimization of the impeller and pumping chamber in a mixed-flow pump.

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“…Many researches have been done on this pump in recent years, which have been highly valued in the industry. Compared with other pumps, the multiphase pump is less efficient because the internal flow in this pump is a complex physical process with all kinds of energy losses [6][7][8][9], especially in the static impeller, where the flow is more disorganized. Therefore, the study of the flow losses in static impeller of the multiphase pump can help to improve the hydraulic performance.…”

Section: Introductionmentioning

confidence: 99%

Flow Characteristics and Energy Loss within the Static Impeller of Multiphase Pump

Jiang

Shi

et al. 2021

Processes

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The internal flow is very complex in the multiphase pump, especially in the static impeller, where the flow is more disorganized than that in the impeller wheel, and it will cause greater hydraulic losses. In order to investigate deeply the flow rules within the static impeller, all kinds of the flow losses are analyzed quantificationally in the multiphase pump. Based on the standard SST k-ω turbulence model, selected the helical axial flow multiphase pump as the research object, used the three-dimensional modeling software for the three-dimensional modeling of the flow through parts of the multiphase pump, such as impeller wheel, the static impeller, the suction chamber, and the extrusion chamber. The ANSYS software is used to simulate the three-dimensional flow in static impeller, and the ICEM software was used to divide the mesh of suction chamber, press outlet chamber, moving impeller and static impeller respectively. The results show that the flow within the impeller wheel is more uniform than the static impeller, and larger axial vortexes appear in the static impeller. Compared with the impeller wheel, the effect of the flow rate on the flow within the first static impeller is greater. The friction loss is the largest among all kinds of losses in the static impeller, followed by the turbulence dissipation loss. What’s more, the shock loss and the contraction loss are the smallest, they are all less than 20%, and the main loss within the static impeller are the turbulent dissipation loss and friction loss. The proportion of energy losses in the first and second static impeller is almost the same, which is around 50%, respectively. The results can be used as a reference for the improvement of the hydraulic performance of the multiphase pump.

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Pressure fluctuation and flow pattern of a mixed-flow pump under design and off-design conditions

Cited by 15 publications

References 20 publications

Experimental Study on the Internal Pressure Pulsation Characteristics of a Bidirectional Axial Flow Pump Operating in Forward and Reverse Directions

Experimental Study on the Internal Pressure Pulsation Characteristics of a Bidirectional Axial Flow Pump Operating in Forward and Reverse Directions

The Influence of a Pumping Chamber on Hydraulic Losses in a Mixed-Flow Pump

Flow Characteristics and Energy Loss within the Static Impeller of Multiphase Pump

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