CFD Numerical Simulation of the Complex Turbulent Flow Field in an Axial-Flow Water Pump

Li, Wanyou; Zhang, Xiang-Yuan; Shuai, Zhi-Jun; Jiang, Chenxing; Li, Feng‐Chen

doi:10.1155/2014/521706

Cited by 11 publications

(9 citation statements)

References 13 publications

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“…The simulation was performed by CFD software (Fluent Ò ) 27,28 based on the physical model established. The fluid boundaries, which are perpendicular to x and y axes, are defined as periodic boundary and symmetric boundary, respectively.…”

Section: Numerical Simulationmentioning

confidence: 99%

Influence of surface roughness on the friction property of textured surface

Zhou

Zhu

Zhang

et al. 2015

Advances in Mechanical Engineering

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In contrast with dimple textures, surface roughness is a texture at the micro-scale, essentially which will influence the load-bearing capacity of lubricant film. The numerical simulation was carried out to investigate the influence of surface roughness on friction property of textured surface. The lubricant film pressure was obtained using the method of computational fluid dynamics according to geometric model of round dimple, and the renormalization-group k-e turbulent model was adopted in the computation. The numerical simulation results suggest that there is an optimum dimensionless surface roughness, and near this value, the maximum load-bearing capacity can be achieved. The load-bearing capacity is determined by the surface texture, the surface roughness, and the interaction between them. To get information of friction coefficient, the experiments were conducted. This experiment was used to evaluate the simulation. The experimental results show that for the frequency of 4 and 6 Hz, friction coefficient decreases at first and then increases with decreasing surface roughness, which indicates that there exists the optimum region of surface roughness leading to the best friction reduction effect, and it becomes larger when area fractions increase from 2% to 10%. The experimental results agree well with the simulation results.

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Section: Numerical Simulationmentioning

confidence: 99%

Influence of surface roughness on the friction property of textured surface

Zhou

Zhu

Zhang

et al. 2015

Advances in Mechanical Engineering

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“…Computational fluid dynamics (CFD) is a tool that can better analyze the water path under complicated conditions, but there have been few studies on the application of CFD in DF. Most researchers have used CFD on drip emitters [8,9], water pumps [10], and other equipment in agricultural irrigation systems. The number of DF flow channels is huge, and the size of the flow channels gradually reduce from the outside to the inside, which is the key to improving the accuracy of the filter [11].…”

Section: Introductionmentioning

confidence: 99%

The Study on Internal Flow Characteristics of Disc Filter under Different Working Condition

Chi

Yang

et al. 2021

Applied Sciences

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A disc filter (DF) is an important component in a micro irrigation system. However, it has a high head loss and low filtration efficiency, which can lead to the inoperability of micro irrigation systems. To improve the filtration ability and to decrease the pressure loss of the irrigation system, it is necessary to internalize the hydraulic characteristics of DFs. In this study, the filter bed of a DF was divided into three parts, i.e., upper, middle, and lower, which were wrapped with a transparent film. The wrapped part was completely blocked. The purpose was to analyze the hydraulic characteristics of different clogged conditions in three types of filters under four types of flows. In addition, we attempted to simulate the filter operation process with computational fluid dynamics, based on two aspects—a macroscopic model and a simplified model. The results showed that the patterns of head loss among all of the DFs was consistent, and the macroscopic model that treated filter bed as a porous medium could express the measured results. The macroscopic models observed that there was a circular flow in the DF, and the flow velocity presented a symmetrical distribution in a horizontal direction. The middle of the filter element appeared in a high-pressure area and demonstrated the highest head loss, which may be the main flow area of the DF, and the inner flow characteristics of the DF were consistent under different conditions. The simplified models showed that the main flow area is near the filter bed in the inner DF, and the flow is tangent to the filter bed between 45 and 90 degrees in a horizontal direction. The uneven distribution of velocity and pressure on the filter bed might be necessary factors to impact filter efficiency.

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“…Furthermore, using latter type of blade can offer an effective means for security and stability in different types of axial fuel pump. Li et al [14] investigated complicated fluid of flow numerically within a rotor pump. They simulated model for rate of flow was 305 kg/s, head of 30 m, speed was about 3000 rpm and SST k-model was used for simulation calculations.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigations of Transient Flow Characteristic in Axial Flow Pump and Pressure Fluctuation Analysis Based on the CFD Technique

Al‐Obaidi¹,

Iraq²,

Mohammed³

2019

JESTR

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The technique of Computational fluid dynamics was applied to investigate flow field analysis including static pressure, axial, radial and tangintial velocities vectors as well as fluctuations of pressure analyses in axial pump. Pressure fluctuations are the core causes increase noise level and vibration. For studying pressure mechanism fluctuation in pump changed monitoring rotating points are stalled at an impeller blade. Standard k-epsilon turbulence model and sliding mesh technique are adopted by using CFD. The numerical investagation found that pressure in an axial flow pump rises near inlet impeller region to outer part. Higher value of pressure was take place at impeller outlet region. Also, the computational analysis noted that the when a pump functions in larger mass flow, the area of high-pressure in impeller outlet decreases. Moreover, under low flow rate (5 l/min) in middle surface the high-speed area appears near or closed blade and blade tip region for all velocities under investigations. Furthermore. fluctuations of pressure for different point under different flows has four valleys and peaks the similar number of axial impeller passages blades. The results foun that there are two imprtant regions the first one ispositive and second one is negative pressures, this happends owing to this negative pressure area has lower pressure value. Therefore, due to the decline in the water pressure in this area may cause cavitation.

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CFD Numerical Simulation of the Complex Turbulent Flow Field in an Axial-Flow Water Pump

Cited by 11 publications

References 13 publications

Influence of surface roughness on the friction property of textured surface

Influence of surface roughness on the friction property of textured surface

The Study on Internal Flow Characteristics of Disc Filter under Different Working Condition

Numerical Investigations of Transient Flow Characteristic in Axial Flow Pump and Pressure Fluctuation Analysis Based on the CFD Technique

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