Hydrodynamically detailed performance analysis of a mixed-flow waterjet pump using computational fluid dynamics

Oh, Hyoung Woo; Yoon, Eul Sik

doi:10.1243/09544062jmes1107

Cited by 14 publications

(12 citation statements)

References 7 publications

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“…The first part of this article presents a computational method for the performance analysis of mixed-flow pump and validates its predictive capability by comparing the numerical flow computations with the experimental results. Figure 1(a) shows the three-dimensional (3D) modelling for a mixed-flow pump system [6] with the non-dimensional specific speed and specific diameter of 2.44 and 1.79, respectively. The previous study [6] constructed an apparatus (Fig.…”

Section: Computational Analysis Methods and Its Validationmentioning

confidence: 99%

“…(a) a mixed-flow impeller with the positive-curved blading whose geometric design variables were determined through the hydraulic design optimization process for the design condition [6]; (b) the other in which most geometric design parameters are the same as the previous ones except for the negative-curved blade stacking. This study compares their performance characteristics for the design and off-design conditions.…”

Section: Introductionmentioning

confidence: 99%

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Design parameter to improve the suction performance of mixed-flow pump impeller

2010

Proceedings of the Institution of Mechanical Engineers, Part A:

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The effect of positive- and negative-curved blade stackings on the cavitation performance of a mixed-flow pump impeller has been investigated in the present study. To this end, two types of pump impellers with different blade stackings with no significant difference in the non-cavitating hydrodynamics were compared. A numerical simulation based on the validated computational fluid dynamics code has been carried out to analyse the detailed flow dynamic phenomena in the mixed-flow pump impeller. From the predicted characteristic curves pertaining to both the stacking conditions, superior suction performance of the mixed-flow pump impeller with the negative-curved blading has been demonstrated over the normal operating flow range. The computational analysis method and a design parameter presented herein can be effectively applied to the hydraulic design optimization process of general-purpose centrifugal and mixed-flow pump impellers.

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Section: Computational Analysis Methods and Its Validationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design parameter to improve the suction performance of mixed-flow pump impeller

2010

Proceedings of the Institution of Mechanical Engineers, Part A:

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“…where h stands for flow layer thickness on S 1 stream surface, h ¼ h(y), and È is the velocity potential function on the conformal transformation plane. After setting boundary conditions, finite element method was applied to obtain numerical results of equation (7). The boundary conditions were set as follows: velocities of the inlet and outlet are uniform distribution in circumferential direction; the relative velocity of the solid wall surface is 0 in normal direction; periodic conditions were given on the boundaries with periodic variations.…”

Section: Direct Calculationmentioning

confidence: 99%

“…Mixed-flow pumps have the advantages of a wide application and a wide range of high efficiency operation, and are extensively used in agricultural irrigation, water diversion, flood prevention and waterlog drainage, and water circulation process. In recent years, scholars have conducted many research works on three-dimensional design, 1,2 performance prediction, [3][4][5] performance analysis [6][7][8] and optimization 9,10 of mixed-flow pumps. Based on experiments and numerical calculation, research works on parameters [11][12][13] that significantly influence mixed-flow pump performance have been carried out, producing many important results, which effectively improved impeller internal flow, efficiency and suction performance.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional design method for mixed-flow pump blades with controllable blade wrap angle

Hao

Cao

2013

Proceedings of the Institution of Mechanical Engineers, Part A:

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In this article, a direct and inverse iteration design method for mixed-flow pumps was introduced, and a three-dimensional design platform for mixed-flow pumps was established. Through iteration calculation of two kinds of stream surfaces to solve both the continuity equation and motion equation of the fluid at the same time, and therefore obtaining the quasi-three-dimensional flow field inside the mixed-flow pump, the accuracy of the flow field calculation was improved. By repeating iteration of the direct calculation and inverse design, influence of blade shape on flow field calculation was fully considered, thus assuring that the final design of blade camber line complies with actual flow pattern. After comparing and analyzing the meridional velocity distribution, as well as the relative circulation distribution and expelling coefficient in the blade zone, it was proved that compared with others designed by conventional methods, the impeller designed with three-dimensional design platform has a better hydraulic performance, especially the blade energy conversion capacity that witnessed a significant improvement. With this three-dimensional design platform, a parametrization was applied to velocity moment distribution and blade leading and trailing edges positions. The influence of velocity moment distribution parameters P and a0, and the blade leading and trailing edges positions parameters θh and θt on blade wrap angle and the internal flow of the impeller were analyzed. By curve fitting, the functional relationship between blade wrap angle ϕ and parameters θt, P and a0 was obtained. The blade wrap angle control strategy during the process of mixed-flow pump impeller design was then put forward, thus realizing three-dimensional design of mixed-flow pump blades with controllable blade wrap angle. The performance test for the mixed-flow pump model suggested that the three-dimensional design method with controllable blade wrap angle, by controlling blade wrap angle size and adopting direct and inverse iteration design method, ensures a better hydraulic and cavitation performance for the mixed-flow pump impeller designed with three-dimensional design platform.

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“…Oh et al [1][2][3] applied the conceptual method to design a mixed-flow marine pump and investigated the effects of blade stacking on cavitation performance. Bonaiuti et al [4] studied parameter effects, including impeller blade loading, stacking, exit vortex distribution, leading edge sweep angle, and exit hub radius.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of cavitation-vortex interaction in a mixed-flow waterjet pump

Huang

Luo

et al. 2015

J Mech Sci Technol

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Turbulent cavitating flows in a mixed-flow waterjet pump were numerically investigated using the k-w SST turbulence model and the mass transfer cavitation model based on the Rayleigh-Plesset equation to provide a comprehensive understanding of the cavitation-vortex interaction mechanism. The predicted hydraulic performance, as well as the cavitation performance, exhibits a reasonable agreement with the experimental results. The vorticity distributions under three operation conditions were illustrated together. Based on the illustration, cavitation development enhances vorticity production and flow unsteadiness in a mixed-flow waterjet pump. Vortices are basically located at the cavity interface, particularly at the downstream interface, during cavitation. Further analyses using the relative vorticity transport equation in cavitating turbulent flows indicate that vortex dilation and baroclinic torque exhibit a steep jump as cavitation occurs. In addition, vortex stretching contributes mainly to large-scale vortex generation.

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Hydrodynamically detailed performance analysis of a mixed-flow waterjet pump using computational fluid dynamics

Cited by 14 publications

References 7 publications

Design parameter to improve the suction performance of mixed-flow pump impeller

Design parameter to improve the suction performance of mixed-flow pump impeller

Three-dimensional design method for mixed-flow pump blades with controllable blade wrap angle

Numerical investigation of cavitation-vortex interaction in a mixed-flow waterjet pump

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