Inverse-design and optimization methods for centrifugal pump impellers

Westra, R.W.

doi:10.3990/1.9789036527026

Cited by 9 publications

(10 citation statements)

References 48 publications

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“…Based on the assumption of the non-axisymmetric flow in the impeller with limited number of blades, many researchers have achieved the redesign of the turbo-machine based on the three-dimension theory with desired characteristics (performance, pressure distribution and so on). [8][9][10] But the difficulty in mathematical solution makes three-dimension theory immature for industrial applications. In this study, due to the flow in long and narrow channels, the effect of viscous diffusion cannot be neglected, so we should find an alternative to reduce the modeling difficulty.…”

Section: Introductionmentioning

confidence: 99%

Theory and application of two-dimension viscous hydraulic design of the ultra-low specific-speed centrifugal pump

Wang

Zhang

Hou

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part A:

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Low efficiency and bad cavitation performance restrict the development of the ultra-low specific-speed centrifugal pump (ULSSCP). In this research, combined turbulent boundary layer theory with two-dimension design and two-dimension viscous hydraulic design method has been proposed to redesign a ULSSCP. Through the solution of the displacement thickness in the boundary layer, a less curved blade profile with a larger outlet angle was obtained. Then the hydraulic and cavitation performance of the reference pump and the designed pump were numerically studied. The comparison of performance of the reference pump calculated by the numerical and experimental results revealed a better agreement. Research shows that the average hydraulic efficiency and head of the designed pump improve by 2.9% and 3.3%, respectively. Besides, the designed pump has a better cavitation performance. Finally, through the internal flow analysis with entropy production diagnostic model, a 24.8% drop in head loss occurred in the designed pump.

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Section: Introductionmentioning

confidence: 99%

Theory and application of two-dimension viscous hydraulic design of the ultra-low specific-speed centrifugal pump

Wang

Zhang

Hou

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part A:

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“…• the dimensionality of the problem considered: two-dimensional [11,13,16,18,19,21,25,30,37,40], quasi three-dimensional [26,30] or three-dimensional [4,5,12,13,29,37,41,43],…”

Section: Introductionmentioning

confidence: 99%

On the inverse problem of blade design for centrifugal pumps and fans

Kruyt

Westra

2014

Inverse Problems

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The inverse problem of blade design for centrifugal pumps and fans has been studied. The solution to this problem provides the geometry of rotor blades that realize specified performance characteristics, together with the corresponding flow field. Here a three-dimensional solution method is described in which the so-called meridional geometry is fixed and the distribution of the azimuthal angle at the three-dimensional blade surface is determined for blades of infinitesimal thickness. The developed formulation is based on potential-flow theory. Besides the blade impermeability condition at the pressure and suction side of the blades, an additional boundary condition at the blade surface is required in order to fix the unknown blade geometry. For this purpose the mean-swirl distribution is employed. The iterative numerical method is based on a three-dimensional finite element method approach in which the flow equations are solved on the domain determined by the latest estimate of the blade geometry, with the mean-swirl distribution boundary condition at the blade surface being enforced. The blade impermeability boundary condition is then used to find an improved estimate of the blade geometry. The robustness of the method is increased by specific techniques, such as spanwise-coupled solution of the discretized impermeability condition and the use of underrelaxation in adjusting the estimates of the blade geometry. Various examples are shown that demonstrate the effectiveness and robustness of the method in finding a solution for the blade geometry of different types of centrifugal pumps and fans. The influence of the employed mean-swirl distribution on the performance characteristics is also investigated.

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“…[111,112]. As mentioned by Westra [113], the first applications of three-dimensional method in turbomachinery design were reported in Refs. [114,115] and extended by Zangeneh [116] in the design method for radial and mixed flow turbomachinery.…”

Section: Inverse Design Methodsmentioning

confidence: 93%

“…3.2.2 can be combined with an inverse design method. For example, the differential evolution method has been applied in the inverse design method of centrifugal pump [113] and axial fan [128]. The ideas of achievable total-to-static efficiency η ts analysis [13] also provide a good method to obtain optimized vortex distribution in the rotor-only axial fan design.…”

Section: Inverse Design Methodsmentioning

confidence: 99%

Design for high efficiency of low-pressure axial fans: Use of blade sweep and vortex distribution

Wang

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Rotor-only low-pressure axial fans with small hub-to-tip diameter ratio (HTR in short) are widely used in many branches of industry, especially for cooling and ventilation purposes. As energy-related products that account for a significant proportion of the consumption of natural resources and energy, optimization of their aerodynamic performance for high efficiency is important to reduce environmental impact. Differently from low-pressure axial fans with medium to high HTR, extensive regions of backflow near the hub are often present downstream of fans with small HTR.In studies of low-pressure axial fans, Computational Fluid Dynamics (CFD) simulations have been frequently employed to analyze in detail the aerodynamic performance and the flow fields inside these machines. For optimization, according to investigations on axial fans with medium to high HTR, sweep, dihedral and skew of the blades' stacking line as well as different vortex distribution designs form important methods. However, for fans with small HTR, only few studies have been reported in the scientific literature on appropriate CFD simulation strategy, three-dimensional stacking and vortex distribution design method.The objective of this thesis is to investigate the effects of sweep, dihedral and skew on the aerodynamic performance of low-pressure axial fans with small HTR and develop an optimal vortex distribution design method for high efficiency of such fans. CFD simulations are extensively used in these investigations. Optimale Vortexverdeling OntwerpmethodeTen slotte zijn de vortexverdeling (als polynoom in de coordinaat in de spanrichting) en de HTR bepaald door het totaal-naar-statisch rendement van een referentie axiaalventilator met kleine HTR te maximaliseren. Voor vrije-vortex ontwerpen zijn analytische uitdrukkingen geformuleerd voor het maximale totaalnaar-statisch rendement en de optimale HTR. Door de vortexverdeling te combineren met een geschikte keuze voor de verdeling (in spanrichting) van de liftcoëfficiënt zijn ventilatorblad ontwerpen verkregen.De CFD-resultaten voor deze ontwerpen laten zien dat de ontwerpen gebaseerd op vrije en polynoom vortexverdelingen voldoen aan de gewenste drukstijging, met aanzienlijk verbeterde totaal-naar-statisch en totaal-naar-totaal rendementen (maximale verbetering met respectievelijk 3.9% en 4.6%).Analyses van de stromingsvelden laten zien dat er geen stromingsloslating aanwezig is in het blad-naar-blad vlak, behalve in de buurt van de naaf. Voor ontwerpen met een kleine HTR is er enige terugstroming stroomafwaarts van de rotor die de stromingsloslating nabij de naaf beïnvloedt.In het algemeen draagt het onderzoek in dit proefschrift bij aan een beter begrip van de aërodynamica van axiaalventilatoren met kleine HTR. De resultaten kunnen worden toegepast voor het ontwerpen van lagedruk axiaalventilatoren met een hoog rendement.

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Inverse-design and optimization methods for centrifugal pump impellers

Cited by 9 publications

References 48 publications

Theory and application of two-dimension viscous hydraulic design of the ultra-low specific-speed centrifugal pump

Theory and application of two-dimension viscous hydraulic design of the ultra-low specific-speed centrifugal pump

On the inverse problem of blade design for centrifugal pumps and fans

Design for high efficiency of low-pressure axial fans: Use of blade sweep and vortex distribution

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