The Optimal Hydraulic Design of Centrifugal Impeller Using Genetic Algorithm with BVF

Zhou, Xin; Zhang, Yongxue; Ji, Zhongli; Hou, Hucan

doi:10.1155/2014/845302

Cited by 14 publications

(9 citation statements)

References 14 publications

(16 reference statements)

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“…(20) and thus the integral range of local entropy production terms by eq. (17) will not include the near wall regions while they are still referred by the original formulas:…”

Section: Entropy Analysismentioning

confidence: 99%

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A numerically research on energy loss evaluation in a centrifugal pump system based on local entropy production method

Hou

Zhang

2017

Therm sci

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Inspired by wide application of the second law of thermodynamics to flow and heat transfer devices, local entropy production analysis method was creatively introduced into energy assessment system of centrifugal water pump. Based on Reynolds stress turbulent model and energy equation model, the steady numerical simulation of the whole flow passage of one IS centrifugal pump was carried out. The local entropy production terms were calculated by user defined functions, mainly including wall entropy production, turbulent entropy production, and viscous entropy production. The numerical results indicated that the irreversible energy loss calculated by the local entropy production method agreed well with that calculated by the traditional method but with some deviations which were probably caused by high rotatability and high curvature of impeller and volute. The wall entropy production and turbulent entropy production took up large part of the whole entropy production about 48.61% and 47.91%, respectively, which indicated that wall friction and turbulent fluctuation were the major factors in affecting irreversible energy loss. Meanwhile, the entropy production rate distribution was discussed and compared with turbulent kinetic energy dissipation rate distribution, it showed that turbulent entropy production rate increased sharply at the near wall regions and both distributed more uniformly. The blade region in leading edge near suction side, trailing edge and volute tongue were the main regions to generate irreversible exergy loss. This research broadens a completely new view in evaluating energy loss and further optimizes pump using entropy production minimization.

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“…(20) and thus the integral range of local entropy production terms by eq. (17) will not include the near wall regions while they are still referred by the original formulas:…”

Section: Entropy Analysismentioning

confidence: 99%

“…The pump model researched is one IS series and then optimized by BVF diagnosis method in [16,17]. As shown in fig.…”

Section: Validation Of Pump Hydraulic Performancementioning

confidence: 99%

A numerically research on energy loss evaluation in a centrifugal pump system based on local entropy production method

Hou

Zhang

2017

Therm sci

Self Cite

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“…Wang et al 6 proposed an energy loss model to optimize the design of a typical multistage centrifugal pump. Recent studies by Zhou et al, 7 and Zhang et al 8 introduced the theory of local vorticity dynamics diagnosis, taking advantage of its ability to significantly amplify unstable flow and examining the boundary vorticity flux (BVF) distribution on the impeller blade to investigate hydraulic performance. This approach was successfully used to provide a reference for vortex dynamics diagnosis to improve the hydraulic design of the centrifugal pump impeller.…”

Section: Introductionmentioning

confidence: 99%

Investigation of flow separation in a centrifugal pump impeller based on improved delayed detached eddy simulation method

Ren

Zhu

et al. 2019

Advances in Mechanical Engineering

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The mechanism of flow separation in the impeller of a centrifugal pump with a low specific speed was explored by experimental, numerical, and theoretical methods. A novel delayed Reynolds-averaged Navier–Stokes/large eddy simulation hybrid algorithm combined with a rotation and curvature correction method was developed to calculate the inner flow field of the original pump for the large friction loss in the centrifugal impeller, high adverse pressure gradient, and large blade curvature. Boundary vorticity flux theory was introduced for internal flow diagnosis, and the relative velocity vector near the surface of the blade and the distribution of the dimensionless pressure coefficient was analyzed. The validity of the numerical method was verified, and the location of the backflow area and its flow features were determined. Finally, based on flow diagnosis, the geometric parameters influencing the flow state of the impeller were specifically adjusted to obtain a new design impeller. The results showed that the distribution of the boundary vorticity flux peak values, the skin friction streamline, and near-wall relative velocities improved significantly after the design change. In addition, the flow separation was delayed, the force applied on the blade was improved, the head under the part-load condition was improved, and the hydraulic efficiency was improved over the global flow ranges. It was demonstrated that the delayed Reynolds-averaged Navier–Stokes/large eddy simulation hybrid algorithm was capable to capture the separation flow in a centrifugal pump, and the boundary vorticity flux theory was suitable for the internal flow diagnosis of centrifugal pump.

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“…With the objective function of maximizing the efficiency and minimizing the NPSHr, the optimization resulted in five different impeller configurations based on the Pareto-front solution. More recently, Zhou et al 11 carried out a study based on a genetic algorithm optimization of centrifugal pump impellers coupled with two-dimensional hydraulic design theory and the flow solver ANSYS/Fluent. The optimal design solution suggested almost the same height but up to a 10% increase in efficiency.…”

Section: Introductionmentioning

confidence: 99%

Automatic optimization of a centrifugal pump based on impeller–diffuser interaction

Guleren

2018

Proceedings of the Institution of Mechanical Engineers, Part A:

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In this study, a centrifugal pump has been optimized using the genetic algorithm coupled with computational fluid dynamics considering the flow physics for various impeller-diffuser configurations. During the automatic optimization process, the population was selected from a pool of pump geometries generated by four design variables; namely the relative diffuser vane angle, number of diffuser vanes, number of impeller blades, and the impeller wrap angle. The genetic algorithm was combined with a flow solver and a computer aided design software which was used also to create the mesh for the generated geometry. Two objective functions were adopted for the optimization: maximum pressure increase and minimum relative flow angle, which is an indication of reverse flow in the impeller. The iteration history of the optimization for the design (2.4 kg/s) and off-design (3.6 kg/s) flow rate showed that the optimization has been converged to an impellerdiffuser configuration within approximately 250 computational fluid dynamics analyses. Three geometries from each optimization with the highest pressure increase were studied for various mass flow rates and the results were compared with those of the original pump. The results show that the first optimization indicates a significant improvement of pressure increase at design flow rate (15.5%) but decrease at larger flow rates. The second optimization which was required after the results of the first optimization enhanced the head for the entire mass flow rates with an average increase of 25.74%.

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The Optimal Hydraulic Design of Centrifugal Impeller Using Genetic Algorithm with BVF

Cited by 14 publications

References 14 publications

A numerically research on energy loss evaluation in a centrifugal pump system based on local entropy production method

A numerically research on energy loss evaluation in a centrifugal pump system based on local entropy production method

Investigation of flow separation in a centrifugal pump impeller based on improved delayed detached eddy simulation method

Automatic optimization of a centrifugal pump based on impeller–diffuser interaction

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