Parametric study and performance improvement of regenerative flow pump considering the modification in blade and casing geometry

Nejad, J; Riasi, Alireza; Nourbakhsh, Ahmad

doi:10.1108/hff-03-2016-0088

Cited by 19 publications

(34 citation statements)

References 22 publications

(27 reference statements)

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“…The turbulence was modeled using the shear stress transport (SST) model with an automatic wall function. The SST turbulence model combines the advantages of − turbulence model and − turbulence model such that − is used in the inner region of the boundary layer and switches to − in the free shear flow [14]. The first grid points adjacent to fluid coupling walls are placed at y + <5.…”

Section: Numerical Simulationmentioning

confidence: 99%

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Design optimization of hydrodynamic coupling applying response surface method combined with CFD technique

Nejadali

2020

J Braz. Soc. Mech. Sci. Eng.

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Hydrodynamic coupling is a type of fluid machinery that uses fluid kinetic energy to transmit power. In this paper, meridional profile optimization of fully filled fluid coupling was performed to improve transmitted torque. The response surface method, a global optimization method, combined with CFD was introduced to find optimum meridional profile of blades. The torque coefficient was applied as an objective function. The response surface method was adopted with three design variables: hydraulic diameter ratio of blades, central core position, and meridional profile of the hub. Results showed that the best diameter ratio occurred at d/D =0.67. To specify an optimal position for the central core, a dimensionless parameter (b/d) was introduced. With regression analysis, it was found that the optimal point occurs at about b/d =0.37. It was confirmed with the results of contour and vector plots. Three types of curves (circular, elliptical, and cubic Bezier curve) were employed to optimize the meridional shape of blades. The circular curve was applied in the design of the hub in the reference geometry. Relative to the circular curve hub, the use of elliptic curve had no significant effect on the objective function. Two dimensionless parameters, l 1 /d and l 2 /d, were defined to investigate the effect of Bezier curves on the performance of hydrodynamic coupling. The optimum values for design variables of l 1 /d and l 2 /d were obtained 0.80 and 0.88, respectively.

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Section: Numerical Simulationmentioning

confidence: 99%

“…The input rotating speed of the impeller was fixed to 3000 rpm. For numerical (1) simulations, the calculation results were considered to have converged when residuals were less than 1 × 10 −4 [8,14].…”

Section: Numerical Simulationmentioning

confidence: 99%

Design optimization of hydrodynamic coupling applying response surface method combined with CFD technique

Nejadali

2020

J Braz. Soc. Mech. Sci. Eng.

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“…Noting that the entropy always increases in the irreversible thermal processes, the entropy production is calculated to evaluate the energy loss of the pump. The total entropy production can be obtained as follows [15]: (8) In Equation 8, represents the entropy production caused by the heat conversion. Since the self-priming pump operates under the condition of a constant temperature, this term is neglected in this study.…”

Section: Energy Characteristic Of the Pumpmentioning

confidence: 99%

“…In Equation (8), S H represents the entropy production caused by the heat conversion. Since the self-priming pump operates under the condition of a constant temperature, this term is neglected in this study.…”

Section: Energy Characteristic Of the Pumpmentioning

confidence: 99%

“…Nejad at el. [8] modified the blade profile into a bucket shape and studied the influence of blade angle, chord, and other parameters on the hydraulic performance; they concluded that the maximum efficiency of the pump can be improved by employing an optimal combination of these parameters. Wang et al [9][10][11] pointed out the factors influencing the energy loss in a multistage centrifugal pump and analyzed the hydraulic loss caused by surface roughness of the impeller shroud experimentally.…”

Section: Introductionmentioning

confidence: 99%

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Numerical and Experimental Study of a Vortex Structure and Energy Loss in a Novel Self-Priming Pump

et al. 2019

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The self-priming pump as an essential energy conversion equipment is widely used in hydropower and thermal power plants. The energy losses in the internal flow passage of the pump directly affect its work efficiency. Therefore, it is important to improve the internal flow characteristic of the pump. In the present work, a novel self-priming pump which starts without water is proposed; this pump can reduce the energy consumption as well as the time needed to start its operation. The spatial structure of the vortices in the pump is investigated by employing the Q criterion with the numerical solution of the vorticity transport equation. Based on the morphology, the vortices can be separated into three categories: Trailing Edge Vortex (TEV), Leading Edge Vortex (LEV) and Gap Leakage Vortex (GLV). Generally, the morphology of the TEV is more disorderly than that of LEV and GLV, and the intensity of TEV is significantly higher than that of the other two vortices. To determine the magnitude and distribution of energy loss in the pump, entropy production analysis is employed to study the influence of blade thickness on energy characteristics of the pump. It is found that with an increase in the flow rate, the location of energy loss transfers from the trailing edge to the leading edge of the blade, and viscous entropy production (VEP) and turbulence entropy production (TEP) are the dominant factors which influence the energy conversion in the pump. More importantly, employing the blade with a thin leading edge and a thick trailing edge can not only significantly reduce the impact of incoming flow under over-load condition (flow rate higher than the design condition) but can also increase the efficiency of the pump. Thus, an increase in thickness of the blade from the leading edge to the trailing edge is beneficial for improving the pump performance. The results of this paper can be helpful in providing guidelines for reducing the energy loss and in improving the performance of a self-priming pump.

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Shape optimization of regenerative flow compressor with aero-foil type blades using response surface methodology coupled with CFD

Nejadali

2021

Struct Multidisc Optim

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Parametric study and performance improvement of regenerative flow pump considering the modification in blade and casing geometry

Cited by 19 publications

References 22 publications

Design optimization of hydrodynamic coupling applying response surface method combined with CFD technique

Design optimization of hydrodynamic coupling applying response surface method combined with CFD technique

Numerical and Experimental Study of a Vortex Structure and Energy Loss in a Novel Self-Priming Pump

Shape optimization of regenerative flow compressor with aero-foil type blades using response surface methodology coupled with CFD

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