Study on Energy Conversion Characteristics in Volute of Pump as Turbine

Miao, Senchun; Zhang, Hong-Biao; Shi, Fengxia; Wang, Xiaohui; Ma, Xiang

doi:10.32604/fdmp.2021.012950

Cited by 8 publications

(4 citation statements)

References 21 publications

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“…Tao et al found that larger volute sections reduced the radial thrust on the impeller and the pressure pulsation in the volute [22]. Miao and Shah et al discussed the effect of volute collectors on the performance of centrifugal pumps based on entropy generation analysis [23,24]. Khalifa and Bairio et al studied the flow pulsation related to the interaction between impeller blades and different types of cutwaters using computational fluid dynamics (CFD) technology and suggested that a rounded cutwater would reduce the strength of pulsation in volutes [25,26].…”

Section: Alemi Et Al Conducted Research On Two Volute Design Methods ...mentioning

confidence: 99%

Analysis and Comparison of Two Kinds of Design Approaches for Volutes of Centrifugal Pump

Gou,

Xiao,

Wang

et al. 2023

Energies

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It is a commonly used method to design volutes for centrifugal pumps by applying statistical data. Different statistical analyses were performed by various pump technicians based on different pump samples and data-processing methodologies. When the performance parameters at the design point of a pump w given, differences in the geometrical parameters and hydraulic characteristics of the finalized volute may exist if different statistical data are applied in the volute design procedure. Two types of typical statistical data extensively used by engineers for volute design were described systematically. As the wetted perimeters of volute sections and volute inlet width are considered two key parameters that have a considerable impact on the hydraulic performance of pumps, one type of statistical data introduced a new shape of volute sections to reduce the wetted perimeter and friction area. In the second type of statistical data, the volute inlet width could be governed by designers to improve flow behavior at the volute entrance. To compare the energy-saving effects of the two types of volute design guidelines, the models of the wet parts of three pumps with different design flows and heads were established. Then, two-volute models were designed and manufactured for each impeller using two-volute statistical data, and the internal flow field of the three pumps under multiple working conditions was simulated using computational fluid dynamics (CFD) technology. The numerical results show that the head and efficiency can be improved using a shorter cross-section wet volute under the same impeller conditions. The influence of the wetted perimeters of the volute sections on the pump performances is more remarkable than that originating from the volute inlet width. The results of this research also show that the statistical data containing the above design principles should be promoted.

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Section: Alemi Et Al Conducted Research On Two Volute Design Methods ...mentioning

confidence: 99%

Analysis and Comparison of Two Kinds of Design Approaches for Volutes of Centrifugal Pump

Gou,

Xiao,

Wang

et al. 2023

Energies

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“…When the residual error of the inlet and outlet volumetric flow rate is less than 10 −5 , the residual error of the velocity in each direction and the parameters, such as k and ε, are less than 10 −4 . When the total pressure of the inlet and outlet sections does not change with time, the calculation can be considered to converge [27].…”

Section: Calculation Methods and Boundary Conditionsmentioning

confidence: 99%

Influence of a Winglet Combined with a Groove Tip on the Performances of a Variable-Pitch Axial Flow Fan

Zhou¹,

Zhou²,

Ye³

2022

Fluid Dynamics &Amp; Materials Processing

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Taking a two-stage variable-pitch axial fan as the research object, five schemes, including a single counter-flow rib layout grooved tip, are numerically simulated using the fluent software. The results indicate that, compared with the original blade tip, the total pressure rise and efficiency of the four proposed schemes have been improved to various degrees, with Scheme 4 (groove tip with double counterflow ribs) displaying the best performances. The total pressure and efficiency are increased by 113.44 Pa and 0.955%, respectively. The blade tip leakage flow is reduced to varying degrees under different schemes, according to the following order: Scheme 1, Scheme 2, Scheme 4, and Scheme 3 leading to a reduction of 7.44%, 6.46%, 5.36%, and 4.35%, respectively. Steady results are used as the initial condition for the ensuing strength check and modal analysis.

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“…Liu, Y. et al [13] proposed a C-slot method to effectively suppress the leakage flow at the top of the blade of the NACA009 hydrofoil and improve its work performance in the tidal energy conversion process. Miao, S. et al [14][15][16] investigated the energy conversion characteristics of hydraulic turbines in pump reversal, concluded that the main energy of the impeller to perform work comes from the pressure energy of the fluid rather than kinetic energy, and that the middle area in front of the impeller is the core area of energy conversion. Zhang, J. et al [17,18] examined the effects of the gas volume fraction and impeller tip clearance on the work performance and flow pattern of the multiphase pump, which showed that an improvement in both the gas volume fraction and impeller tip clearance would reduce the head and efficiency of the multiphase pump.…”

Section: Introductionmentioning

confidence: 99%

Effect of Flow on the Energy Conversion Characteristics of Multiphase Pumps Based on Energy Transport Theory

Tang,

Shi,

et al. 2023

Water

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Multiphase pumps operate under different flow conditions with different work performance. In order to reveal the energy conversion regulations in multiphase pumps under different flows, this paper presents an analysis of the effects of different flows on the pressure propulsion power, Lamb vector dispersion, and vortex enstrophy dissipation in the pressurization unit of a multiphase pump based on energy transport theory. It is found that at different flows, the pressure propulsion power near the impeller inlet decreases sharply, the pressure propulsion power is mainly located in the first half of the impeller near the suction side of the blade, and with the increase in the flow, the pressure propulsion power in the pressurization unit increases gradually, as well as its energy loss, while the Lamb vector dispersion gradually increases and the area of scattering region tends to be narrow under the small impeller tip clearance, while the Lamb vector dispersion region area slowly decreases with the flow rate when the impeller tip clearance is larger. The effect of flow on the vortex enstrophy dissipation in the multiphase pump is mainly located in the middle of the impeller near the blade pressure surface, and as the flow increases, the value of the vortex enstrophy dissipation in the impeller pressurization unit increases accordingly, and the vortex enstrophy dissipation in the first half of the impeller is even more chaotic. The investigation results have significant theoretical meaning for the deep mastery of the energy conversion characteristics in multiphase pumps.

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Study on Energy Conversion Characteristics in Volute of Pump as Turbine

Cited by 8 publications

References 21 publications

Analysis and Comparison of Two Kinds of Design Approaches for Volutes of Centrifugal Pump

Analysis and Comparison of Two Kinds of Design Approaches for Volutes of Centrifugal Pump

Influence of a Winglet Combined with a Groove Tip on the Performances of a Variable-Pitch Axial Flow Fan

Effect of Flow on the Energy Conversion Characteristics of Multiphase Pumps Based on Energy Transport Theory

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