scholarly journals Influence of Different Lateral Bending Angles on the Flow Pattern of Pumping Station Lateral Inflow

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Jiren Zhou ◽  
Miaomiao Zhao ◽  
Chuan Wang ◽  
Zhenjun Gao
Keyword(s):  
Numerical Simulation ◽  
Flow Pattern ◽  
Water Flow ◽  
Large Scale ◽  
Lateral Bending ◽  
Pumping Station ◽  
Lateral Inflow ◽  
Inlet Conditions ◽  
Backflow Zone ◽  
Bending Angles

A model of the pumping station lateral inflow forebay was established to explore the influence of different lateral bending angles of the pumping station lateral inflow. The lateral bending angles were set at 45° and 60°, and the two schemes were calculated separately. Analyzing the results of the numerical simulation showed that the flow patterns of the diversion passages of different schemes were good, but the advancing mainstream of the 1# inlet passage near the sidewall was seriously deviated after entering the forebay. Most of the water can flow smoothly into the inlet passage, while a small part of the water flowed into the sidewall and formed a backflow, resulting in a large-scale backflow zone near the left sidewall of the forebay. Moreover, the flow in the backflow zone was turbulent, which affected the water inlet conditions of the 1# water flow passage. Comparing the water inlet conditions of the water passage with the numerical simulation results of 45° and 60° bending angles showed that the larger the lateral bending angle of the forebay was, the worse the flow pattern of the water flow, and the more unfavorable the pump operation.

Improvement of Performance on Flow-Cutoff of Flap Valves Set in the Pressurized Tank of Pumping Station Based on Numerical Simulation

2013 ◽  
Vol 419 ◽  
pp. 86-90
Author(s):  
Yong Hai Yu ◽  
Bin Cheng
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Large Scale ◽  
Axial Flow ◽  
Free Water ◽  
Flow Distribution ◽  
Pumping Station ◽  
Simplec Algorithm ◽  
Distribution Uniformity ◽  
Free Plane

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.

scholarly journals Analysis of the Flow Pattern and Flow Rectification Measures of the Side-Intake Forebay in a Multi-Unit Pumping Station

Water ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 2025
Author(s):  
Ahmed Nasr ◽  
Fan Yang ◽  
Yiqi Zhang ◽  
Tieli Wang ◽  
Mahmoud Hassan
Keyword(s):  
Numerical Simulation ◽  
Velocity Distribution ◽  
Flow Velocity ◽  
Flow Pattern ◽  
Three Dimensional ◽  
Operating Efficiency ◽  
Water Tank ◽  
Three Dimensional Model ◽  
Pumping Station ◽  
Area Reduction

To improve the problem of turbulence in the forebay of the lateral inlet pumping station, a typical lateral inlet pumping station project in Xuzhou, Jiangsu Province, China was taken as the research object. The forebay of the pumping station is a building connecting the river channel and the pumping station into the water tank. Based on the Reynolds-averaged Navier-Stokes (RANS) law and the turbulence model, the computational fluid dynamics method (CFD) technology compares and analyzes the numerical simulation with or without rectification measures for the forebay of the lateral intake pumping station when multiple units are operating. The three-dimensional model was created by SolidWorks modeling software and the numerical simulation simulated by CFX-ANSYS. To alter the flow pattern in the forebay of the pumping station, various rectification measures were chosen. Internal rectification flow patterns in the forebay under multiple plans, uniformity of flow velocity distribution in the measuring section, and vortex area reduction rates are investigated and compared. Based on the analysis and comparison of numerical simulation results, when the parabolic wall and some rectification piers are set significantly it improves the flow pattern of the forebay of the lateral inlet pumping station. It also makes the flow pattern of the inlet pool better and increases the uniformity of the flow velocity distribution by 8%. Further, it reduced the vortex area by 70%, effectively improving the operating efficiency of the pump. The research results of this paper provide a technical reference for the improvement of the flow pattern in the forebay of the lateral inlet pumping station.

scholarly journals Numerical and Experimental Investigations of Flow Pattern and Anti-Vortex Measures of Forebay in a Multi-Unit Pumping Station

Water ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 935
Author(s):  
Fan Yang ◽  
Yiqi Zhang ◽  
Chao Liu ◽  
Tieli Wang ◽  
Dongjin Jiang ◽  
...  
Keyword(s):  
Flow Field ◽  
Flow Pattern ◽  
Large Scale ◽  
Reduction Rate ◽  
Flow Speed ◽  
Experimental Investigations ◽  
Physical Model Test ◽  
Engineering Practice ◽  
Technical Problems ◽  
Pumping Station

The forebay of a pumping station is an important building connecting the diversion channel and the intake pool. Based on the physical model test and research method of computational fluid dynamics (CFD) based on the improved fluid volume model, the flow field in a forebay of a multi-unit pumping station is analyzed in combination with the engineering practice of the Exi River flood discharge station in the Anhui Province, China. Aiming at the technical problems of a large-scale swing water area in the forebay internal flow field of a lateral intake pumping station, the technical problems are discussed. Different rectification measures are selected to adjust the flow pattern in the forebay of a pumping station. The internal rectification flow pattern in the forebay under different plans, the uniformity of flow velocity distribution in the measurement section, and the reduction rate of the vortex area are studied and compared, and the optimal plan is given. The results show that the flow pattern of the 7.5 m and 15 m solutions of the lengthened inflow wall is still poor, and the ability to eliminate vortices is not strong or even counterproductive. The combination plan of a rectifier sill and a rectifier pier has a better effect and can eliminate more than 90% of the vortex, but the uniformity of flow speed has not been significantly improved at the inlet of the pumping station; the combination plan of a rectifier sill and a diversion wall opening has the best effect; the reduction rate of the vortex area is more than 85%, and the velocity uniformity of three measuring sections is better than that of the original plan. The uniformity of flow rate near the pumping station is increased by 4% and that far away from the pumping station is increased by 13%. The combination plan of a rectifier sill and diversion wall with openings is recommended.

Analysis and Optimization of Flow Pattern in Inlet Passage of Pumping Station

2011 ◽  
Vol 130-134 ◽  
pp. 2485-2488
Author(s):  
Yuan Bo ◽  
Wei Min Feng ◽  
Mei Qing Liu ◽  
Qiu Wei Li
Keyword(s):  
Numerical Simulation ◽  
Flow Pattern ◽  
Operating Condition ◽  
Pumping Station ◽  
Ideal Flow ◽  
The Ideal

Compared RNG and Realizable model with experiment results in numerical simulation in inlet passage，conclusion Realizable k-e model is better reasonable in simulation can be pertained. In order to obtain ideal flow pattern ,Realizable k-e model could be using to simulate the passage and analyze flow pattern. Based on the simulation passage configuration can be modified to pursue ideal flow pattern, which can result in ideal inlet of pump and improve pump operating condition, vibration and noise in pumping station. Inlet passage flow pattern can be modified by using triangle piers,comparing different configuration can obtain the ideal results.

Study on Improving the Flow in Forebay of the Pumping Station

2010 ◽  
Author(s):  
Chao Liu ◽  
Jiren Zhou ◽  
Li Cheng ◽  
Yan Jin ◽  
Xu Han
Keyword(s):  
Flow Pattern ◽  
Large Scale ◽  
Three Dimensional ◽  
Flow Distribution ◽  
Flow Fields ◽  
Computational Results ◽  
Pumping Station ◽  
Flow Motion ◽  
Improved Design ◽  
Good Flow

The flow pattern in the forebay of pumping station is of very important influence on the operation of the pumps. The different kinds of unlike flow pattern, such as large scale circulations and vortices, are often found in the forebay of pumping station especially with multi-pumps. This paper takes the study on improving the flow pattern in the forebay to ensure a good flow condition for pumps operation. The computational results of three dimensional flow fields in an original designed forebay were obtained and a large circulation was found in the forebay on the side which caused serious problems to the operation of pumps. A typical combined means were applied to improve the flow motion. The computational results of the flow fields shows that the large circulation was eliminated and the flow distribution was improved, which was verified by the model test. The improved design has been successfully used to a large pumping station.

Numerical Simulation of Optimized Forebay of Pumping Station

2009 ◽  
Author(s):  
Li Cheng ◽  
Jiren Zhou
Keyword(s):  
Numerical Simulation ◽  
Large Scale ◽  
Experiment Data ◽  
Pumping Station ◽  
Calculation Results ◽  
Simplec Algorithm ◽  
Original Scheme ◽  
Volume Method ◽  
Calculated Model ◽  
Good Agreement

The incompressible N-S equations are solved by the finite volume method. Based on the standard k-e model, the SIMPLEC algorithm is applied for the solution of the discretization governing equation. Using CFD, the flow pattern in the forebay of pumping station is revealed. The calculation results showed that there were large scale recirculation in the forebay of original scheme and the flow patterns of optimized forebay with bottom sills were improved. The calculated results were in good agreement with experiment data, which show that the calculated model was reliable and practical.

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