Design of Mixed Flow Pump Impeller Blade using Mean Stream Line Theory and its Analysis

Zindani, Divya; Roy, Arun K.

doi:10.24200/sci.2018.20829

Cited by 3 publications

(3 citation statements)

References 21 publications

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“…e impeller is the core part of the centrifugal pump, and the impeller blade profile plays a vital role in the fluid flow which will directly impact the performance of centrifugal pumps. At present, there have been many studies on the influence of the impeller parameters on the flow characteristics of centrifugal pumps [11][12][13][14][15][16][17][18][19][20]. Tao et al [21] used the numerical method to study how the blade thickness influenced the flow characteristics in the impeller passages and volute casing.…”

Section: Introductionmentioning

confidence: 99%

Influence of Blade Profiles on Plastic Centrifugal Pump Performance

Zhang

Tang

Zhao

2020

Advances in Materials Science and Engineering

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To study the influence of blade profiles of the plastic centrifugal pump on pump performance, the impeller blade profiles were designed and drawn by the single arc method, double arc method, logarithmic spiral method, and B-spline curve method, respectively, with the known structural parameters.The shape and size of four profiles were drawn, and two-dimensional models and three-dimensional models of four impellers and volute were completed, respectively. The impeller models were printed by 3D printing technology, and the performance experiments of the plastic centrifugal pump were carried out. The numerical simulation of the internal flow field was performed. From the contours of the velocity and pressure, the vapor volume fraction distribution, and fluid-structure interaction analysis of impellers, the impeller drawn by the logarithmic spiral method was better than others. The optimization of the logarithmic spiral method was completed. The impeller inlet and outlet diameters (D1 and D2) and impeller inlet and outlet installation angles (β1 and β2) were taken as control variables, and the total power loss and the minimum NPSHr of the pump were taken as the objective functions. The optimization results were that D1 = 58 mm and D2 = 162 mm and β1 = 17° and β2 = 31°. The hydraulic efficiency was increased by 1.68%.

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Section: Introductionmentioning

confidence: 99%

Influence of Blade Profiles on Plastic Centrifugal Pump Performance

Zhang

Tang

Zhao

2020

Advances in Materials Science and Engineering

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“…During test, the working medium is water at the temperature of 25°C. According to the recommended tip clearance size in [39], the optimum tip clearance is always 0.5% times the blade chord length. us, when the tip clearance is about 0.5 mm in this study, it is closest to the recommended size.…”

Section: Research Modelmentioning

confidence: 99%

Experimental Study of Pressure Pulsation in a Mixed-Flow Pump with Different Tip Clearances Based on Wavelet Analysis

Shi

et al. 2020

Shock and Vibration

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In order to investigate the effect of various impeller tip clearances on the pressure pulsation in a mixed-flow pump, the energy performance test and pressure pulsation experiment of a mixed-flow pump with different tip clearances are studied simultaneously. The pressure pulsation signals at impeller inlet, middle, and oulet are processed and analyzed by the wavelet transform. The results show that the change of tip clearance can affect the head and efficiency of mixed-flow pump. Under designed flow rate, when the tip clearance increases from 0.2 mm to 1.1 mm, the head and efficiency decrease by 18.1% and 11.6%, respectively. Due to the strong influence of blade passing frequency (BPF) at impeller middle, the period of pressure pulsation curve is about 1/4 of impeller rotation period. At impeller inlet, the low-frequency pulsation with energy concentration is the main disturbance frequency, and, with the increase of tip clearance, not only does the high-value region of wavelet spectrum expand to low-frequency direction but also it is easy to form second-order peaks in the time-averaged wavelet curve. At impeller outlet, affected by BPF and rotor-stator interaction (RSI), the high-frequency disturbance in RSI area decreases first and then increases. The wavelet coherence demonstrates the stable low-frequency disturbances in comparison to others and it will affect the flow field at impeller middle.

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“…According to the hydraulic design method guide for impeller of a mixed-flow pump, 32 the size of tip clearance should not be more than 1% the blade chord length. Thus, four tip clearance sizes (0.2 mm, 0.5 mm, 0.8 mm and 1.1 mm) meeting this criteria are selected in this study to investigate the transient characteristics of the mixed-flow pump of Figure 1.…”

Section: Simulation Modelmentioning

confidence: 99%

Transient characteristics of internal flow fields of mixed-flow pump with different tip clearances under stall condition

Shi

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part A:

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This paper investigates the influence of different tip clearances on the transient characteristics of mixed-flow pump under stall condition. The instantaneous internal flow fields of mixed-flow pump with four tip clearances (0.2 mm, 0.5 mm, 0.8 mm and 1.1 mm) are explored by conducting unsteady time accurate simulations. Reynolds-averaged Navier-Stokes (RANS) equations are employed in the simulations and the results of computations are compared with experimental data. The results show that the pump head decreases by 22.1% and the pump efficiency drops by 13.9% at design flow condition when the impeller tip clearance increases from 0.2 mm to 1.1 mm. The swirling flow occurs in the inlet pipe of the mixed-flow pump with different tip clearances under stall condition, and the initial starting point of the swirling flow gets further away from the impeller inlet with increase in tip clearance because of increase in circumferential velocity and change in momentum of the tip leakage flow (TLF). The high turbulent eddy dissipation (TED) regions in the flow are attributed to the TLF, swirling flow, back flow and stall vortex, and their intensity are affected by the change in tip clearance. The oscillating trend of time domain distribution of TED enhances first and then decreases with increase in tip clearance and it exhibits a propagation feature under the effect of stall vortex, while most of the energy in the frequency domain remains concentrated in the low frequency part under stall condition.

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Design of Mixed Flow Pump Impeller Blade using Mean Stream Line Theory and its Analysis

Cited by 3 publications

References 21 publications

Influence of Blade Profiles on Plastic Centrifugal Pump Performance

Influence of Blade Profiles on Plastic Centrifugal Pump Performance

Experimental Study of Pressure Pulsation in a Mixed-Flow Pump with Different Tip Clearances Based on Wavelet Analysis

Transient characteristics of internal flow fields of mixed-flow pump with different tip clearances under stall condition

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