Analysis of effect of impeller geometry including blade outlet angle on the performance of multi-pressure pumps: Simulation and experiment

Mohammadi, Nader; Fakharzadeh, M.

doi:10.5755/j01.mech.23.1.17676

Cited by 8 publications

(6 citation statements)

References 10 publications

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“…Korkmaz et al [10] presented the effect of the number of blades, blade discharge angles and splitter blade lengths on the performance of deep well pump by experiments. Mohammadi et al [11] built the model of the impeller with three different outlet angles (27°, 30° and 33°) by the SOLIDWORKS software and obtained the optimal case which can reduce hydraulic and mechanical losses significantly. Wang et al [12] designed forward-curved blades impellers with inlet angles of blade 71°, 90°, 111° and 135°, respectively, and analyzed the correlation between the maximum efficiency of pump as turbine with the inlet angles of blade.…”

Section: Introductionmentioning

confidence: 99%

Effect of blade profile with different thickness distribution on the pressure characteristics of novel self-priming pump

Chang

Shi

et al. 2018

J Braz. Soc. Mech. Sci. Eng.

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As the conventional self-priming pump cannot satisfy the requirement of quick aerofluxus, a novel self-priming pump with distinct structure and the extraordinary self-priming mechanism was designed to afford promising opportunities for emergency water delivery. Meanwhile, to obtain the optimal profile of the blade, nine blades with different thickness distribution were systematically investigated based on computational fluid dynamics, and in order to benchmark the numerical calculation, the relevant external characteristic test was conducted. According to the results, spatial structure of boundary-layer separation bubble (BLSB) was displayed clearly by employing the new space coordinate system, which can not only trigger the hydraulic loss, but also give rise to the blockage of the passage. Additionally, the amplitude of pressure fluctuation on the blades initially decreases and subsequently rises with the flow rate increases, and the minimum amplitude was obtained under design flow rate. Furthermore, compared with the pressure fluctuation, induced noise and hydraulic characteristic of the blades with different thickness distribution, the blades with thickness distribution of 3-6-6 from inlet to the outlet are superior to the other blades obviously. Therefore, it reflects that the thickness distribution of the blade exerts vital influences on the performance of the self-priming pump, and this research could provide reference for designing the thickness distribution of the blades.

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Section: Introductionmentioning

confidence: 99%

Effect of blade profile with different thickness distribution on the pressure characteristics of novel self-priming pump

Chang

Shi

et al. 2018

J Braz. Soc. Mech. Sci. Eng.

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show abstract

“…They observed that the performance curves became smoother and flatter as the outlet blade angle increased. Mohammadi and Fakharzadeh (2017) studied the effects of various outlet blade angles on the hydraulic performance of a multi-pressure pump. Numerical and experimental results revealed that maximal head and efficiency were obtained with an outlet blade angle of 30°.…”

Section: Introductionmentioning

confidence: 99%

Effects of the Centrifugal Pump Outlet Blade Angle on Its Internal Flow Field Characteristics under Cavitation Condition

Wang

Zhao²,

Han³

et al. 2023

JAFM

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The outlet blade angle is a key geometrical parameter that governs how the impeller directly influences centrifugal pump performance. Therefore, a reasonable angle selection is crucial. To investigate the effects of the outlet blade angle on centrifugal pump internal flow field characteristics under cavitation conditions, this study employs a combination of a modified SST k-ω turbulent model with a Zwart-Gerber-Belamri cavitation model to perform transient flow simulations. Outlet blade angles of 15°, 20°, 25°, 30°, and 35° were tested. The results indicated that as the outlet blade angle increased, the relative liquid flow angle, vapor volume, and corresponding fraction first increased, then decreased, and finally increased again. Meanwhile, the distribution scope of each stall vortex on the suction surface became smaller, then larger, and smaller again, whereas the scopes of the pressure surfaces grew constantly as the outlet blade angle increased. Pressure fluctuations at all monitored points in the volute became weaker over time, and variations in the pressure fluctuations alternated with the outlet blade angle. The main frequency amplitude increased and the frequency doubling decreased as the outlet blade angle increased. Although the energy corresponding to the main frequency was unstable, it consistently held the dominant position. The duration that cavitation compliance was less than 0 first decreased and then increased as the outlet blade angle increased. For the impeller with an outlet blade angle of 25°, stall vortices accounted for the smallest regions, and the duration of negative cavitation compliance was minimized. In this case, the overall performance of the centrifugal pump was optimal.

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“…Delayed detached eddy simulation was employed to study the evolution of the unsteady flow structure in turbomachinery [12][13][14]. The impact of the unsteady internal flow field induced by the relative motion of the rotating blade with the volute on the aeroacoustics behavior of centrifugal fans was investigated using CFD [15,16].The influence of the pump geometry parameters, such as the blade outlet angle and the clearance between the impeller and its volute on the pump performance was investigated by means of numerical approach have been also conducted [17,18].…”

Section: Introductionmentioning

confidence: 99%

Transient Numerical Simulation of a Large-Sized Cement-Mill Fan for Performance Prediction

Amour

Menasri

2023

mech

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In many engineering applications, particle-laden flows are a necessary part of the conveying process, but in other situations, they could have unintended consequences that must be avoided. As a part of the exhausting process, the induced cement-mill fan (FN-280) installed in a cement plant operates under critical conditions with the presence of high content of cement particles. Over time the dragged solid particles erode the rotating and stationary parts of the fan causing their damage. If one decides on a numerical approach to predict regions most prone to erosion and track the solid particle's trajectory within the fan domain by assuming a one-way coupling regime between the continuous and discrete solid phases, a deep insight into the flows physics within the centrifugal fan is required. With this aim, a three-dimensional numerical approach for the hole unsteady flow in a large-sized industrial centrifugal fan has been carried out in this paper. A fully resolved sliding mesh approach was employed to take into account the unsteady interaction between the impeller and the discharge volute. Based on the characteristic performance curves, the numerical results of the unsteady simulation at four operating conditions are validated with the experimental data. The comparisons reveal that the results of the unsteady simulation are in an acceptable level of agreement with the experiment, demonstrating the validity of the modelling approach adopted in this study.

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Analysis of effect of impeller geometry including blade outlet angle on the performance of multi-pressure pumps: Simulation and experiment

Cited by 8 publications

References 10 publications

Effect of blade profile with different thickness distribution on the pressure characteristics of novel self-priming pump

Effect of blade profile with different thickness distribution on the pressure characteristics of novel self-priming pump

Effects of the Centrifugal Pump Outlet Blade Angle on Its Internal Flow Field Characteristics under Cavitation Condition

Transient Numerical Simulation of a Large-Sized Cement-Mill Fan for Performance Prediction

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