Comparison of Rotation and Water Distribution Uniformity Using Dispersion Devices for Impact and Rotary Sprinklers

Issaka, Zakaria; Li, Hong; Jiang, Yue; Tang, Pan; Chao, Chen

doi:10.1002/ird.2375

Cited by 11 publications

(4 citation statements)

References 19 publications

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“…Under some flow conditions it may cause vibration, fatigue and even fracture of the blades [6][7][8]. In addition to reducing the efficiency of the pump, the stall phenomenon also has a serious negative influence on the safety and stability of the pump system [9,10]. At present, the research on centrifugal pump stall is still very limited, and therefore in-depth research considering all aspects is needed to explore the mechanism of stall and use this understanding to improve the efficiency and reliability of centrifugal pumps.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Various Turbulence Models and Large Eddy Simulation for Stall Prediction in a Centrifugal Pump

Bai,

Hu,

Wang

et al. 2023

Water

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Rotational stall is an unstable flow phenomenon that reduces the performance of centrifugal pumps, usually occurring under partial load conditions. It causes instability in the flow resulting in intense vibrations and noise under certain flow conditions. In this study, the one-equation Wray–Agarwal (WA) turbulence model, which was recently developed, is employed to numerically simulate the internal flow field of a centrifugal pump under the deep stall condition. The aim of this study is to examine the prediction accuracy for stall by using the WA turbulence model. The method based on computational fluid dynamics (CFD) has been widely applied for investigation of complex flow patterns in pumps by solving Reynolds-averaged Navier-Stokes (RANS) equations. Particle image velocimetry (PIV) experimental results were compared with simulations predicted using the WA, renormalization group (RNG) k−ε, shear stress transport (SST) k−ω, and realizable k−ε turbulence models and large eddy simulations (LES). The comparisons indicated that the WA turbulence model can accurately predict the flow separation and has a good agreement with the PIV data. The WA model adds a cross-diffusion term and a blending function to the eddy viscosity R equation, so that this model could be expressed as a one-equation k−ω model or one-equation k−ε model as needed by using the switching function. The results show the strong potential of the WA model for accurately computing the stall in rotating fluid machinery. The outcomes of the study are useful in development and optimization of fluid machinery with a low calculation cost and a high accuracy.

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Section: Introductionmentioning

confidence: 99%

Evaluation of Various Turbulence Models and Large Eddy Simulation for Stall Prediction in a Centrifugal Pump

Bai,

Hu,

Wang

et al. 2023

Water

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“…Therefore, the usual field tests for sprinkler irrigation uniformity is labor and timeconsuming (Zhang et al, 2018), which has motivated the development of alternative methods (Maroufpoor et al, 2019). The arrangement of catch cans in radial lines has been used in tests under indoor conditions performed in laboratories (Fordjour et al, 2020;Issaka et al, 2019;Zhang et al, 2018). Methods that require the use of catch cans arranged only in some alignments of the test area would allow a significant reduction in the number of cans, providing savings in time and financial resources.…”

Section: Introductionmentioning

confidence: 99%

Two-dimensional spatial distribution modeling of sprinkler irrigation

Borges

Andrade

2021

Rev. Ceres

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Irrigation can provide significant agronomic and financial returns on agricultural activity. The maximization of the benefits obtained from irrigation depends, among other factors, on the water use efficiency, which is intrinsically related to application uniformity. For the sprinkler method, the irrigation uniformity assessment is based on results of labor-intensive field tests in which the two-dimensional water distribution pattern is measured in a grid of catch cans. The aim of this study was to evaluate a simplified methodology for determining the irrigation uniformity using water depth distribution data of a single sprinkler head in operation, positioned at the intersection of two diagonal alignments containing regularly spaced catch cans. Three methods to simulate the spatial water distribution on the alignments were evaluated: linear interpolation (LI), cubic spline (SC) and second-degree polynomial regression (PR). Each of these methods were associated with a procedure to calculate the two-dimensional spatial water distribution. The adequacy of the LI and SC modeling methods was verified by using the Wilcoxon-Mann-Whitney test (p-value < 0.05) applied to the data of the field tests. Mean values of the coefficient of efficiency equals to 0.771 and 0.785 were obtained for the LI and SC methods, respectively. The PR method underperformed the others.

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“…Up till now, with the rapid development of computational fluid mechanics (CFD) [15][16][17][18][19][20], many researches about the pressure pulsation and TLF have been carried out simultaneously, but those kinds of literature mostly focus on the flow structure of TLF and tip leakage vortex and there are few reports about the relationship between TLF and pressure pulsation. For instance, Liu et al [21][22][23] conducted numerical simulations for a mixed-flow pump with different tip clearances using a commercial CFD code to study the tip leakage vortex structure and trajectory.…”

Section: Introductionmentioning

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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Comparison of Rotation and Water Distribution Uniformity Using Dispersion Devices for Impact and Rotary Sprinklers

Cited by 11 publications

References 19 publications

Evaluation of Various Turbulence Models and Large Eddy Simulation for Stall Prediction in a Centrifugal Pump

Evaluation of Various Turbulence Models and Large Eddy Simulation for Stall Prediction in a Centrifugal Pump

Two-dimensional spatial distribution modeling of sprinkler irrigation

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

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