3D Numerical Simulation and Performance Predication of Vertical Axial Flow Pumping Station by RNG Turbulent Model

Two small flap valves arranged in parallel for each pump were used as flow-cutoff device in certain large-scale axial flow pumping station where the pressurized tank was designed as outlet structure. The flap valves of side-set pump had the poorest performance on flow-cutoff in the pumping station. The flow field in the pressurized tank was shown based on numerical simulation in order to improve the flow-cutoff performance of flap valves. The standard k-ε turbulence model and momentum equations were solved in the SIMPLEC algorithm with the assumption that the free water surface remained flat as a stress-free plane of symmetry. The velocity distribution and free outflow were prescribed on inlet and outlet boundary respectively. Numerical simulation on the flow field in pressurized tank was done at three typical moments chosen in the basis of the flow variation in the process of shutdown of flap valves. The reason that two flap valves of side-set pump could not close simultaneously and the late closing flap valve had a huge force on the wall was analyzed based on the comparison of flow field for side-set pump and middle-set pump. The result from numerical simulation proves that the division pier with appropriate size which helps to improve the flow distribution uniformity is valid for the two flap valves of side-set pump to close simultaneously.

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Study on the Relationship between Impeller Design Parameters and Performance of Partial Emission Pump Based on CFD Technology

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.532.447 ◽

2014 ◽

Vol 532 ◽

pp. 447-451

Author(s):

Li Sheng Zhang ◽

Jin Jiang ◽

Zhi Huai Xiao ◽

Yan Hui Li

Keyword(s):

Numerical Simulation ◽

Numerical Simulations ◽

Inclination Angle ◽

Static Pressure ◽

Separation Bubble ◽

Design Parameters ◽

Turbulent Model ◽

Blade Length ◽

And Performance ◽

The Relationship

In this paper, the relationship between impeller design parameters and performance of a partial emission pump is studied by numerical simulation. Nine straight radial impellers with different blade ratio γ (short blade length to long blade length ratio, γ=50%, 70% and 90%) and different front inclination angle β (β=8, 12 and 16 degree) were designed, while the rest geometric parameters of the pump were kept unchanged. All the numerical simulations were carried out by using the commercial software FLUENT V12.1 based on the Realizable k-ε turbulent model. The results showed that with increasing of front inclination angle, the capacity-head curve drops, the maximum head all appears at blade ratio γ=90%. The static pressure increases with increasing radius. A separation bubble can be observed at the outlet of diffuser tube.

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3D Numerical Simulation of Flow Perpendicular to One Face of a Cube in a Straight Rectangular Duct

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.130-134.2681 ◽

2011 ◽

Vol 130-134 ◽

pp. 2681-2683

Author(s):

Ming Qin Liu ◽

Y.L. Liu

Keyword(s):

Numerical Simulation ◽

Flow Model ◽

Turbulent Model ◽

Rectangular Duct ◽

3D Numerical Simulation ◽

Compressible Viscous Fluid ◽

Turbulence Flow ◽

Model Combining ◽

Proposed Model ◽

Volume Method

In this paper, a numerical flow model combining with the Realizable k–ε turbulent model for compressible viscous fluid is presented for the simulation the flow perpendicular to one face of a cube in a straight rectangular duct; and the equations are solved with the finite volume method. The computed velocity field distribution shows that the proposed model is reliable and can be applied to the numerical simulation of turbulence flow in ducts.

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3D-Numerical Simulation and Performance Predication of Vertical Axial Flow Pumping Station

Volume 2: Fora, Parts A and B ◽

10.1115/fedsm2007-37399 ◽

2007 ◽

Author(s):

Li Cheng ◽

Chao Liu ◽

Fangping Tang ◽

Jiren Zhou ◽

Hua Yang

Keyword(s):

Reference Frames ◽

Axial Flow ◽

Hydraulic Performance ◽

Water Transfers ◽

Pumping Station ◽

Pumping System ◽

North Water ◽

Simplec Algorithm ◽

And Performance ◽

Volume Method

In order to study flow pattern and hydraulic performance of vertical pumping station with bell inlet and worm outlet, which was used by South-to-North water transfers project, the incompressible N-S equations are solved by the control finite volume method. Based on the RNG k-ε model with Wall-Function Law, the SIMPLEC algorithm is applied for the solution of the discretization governing equations. Using multiple reference frames, the flow detail of whole vertical pumping system is attained. The named height of pump is put forward. The numerical hydraulic performance was computed. A good agreement was achieved between predicted data with experimental data on BEP. This type of pumping station will be applied in the East Route Project of South-to-North Water Transfers of China.

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