Investigation and Numerical Simulation of a Water Hammer with Column Separation

2015 ◽  
Vol 141 (3) ◽  
pp. 04014080 ◽  
Author(s):  
Daniel Himr
Keyword(s):  
Numerical Simulation ◽  
Water Hammer ◽  
Column Separation

Study on Setting of One-Way Surge Tank in Long Water Supply Engineering

2008 ◽  
Author(s):  
Jianyong Hu ◽  
Jian Zhang ◽  
Weihua Lu ◽  
Shibo Ma
Keyword(s):  
Numerical Simulation ◽  
Theoretical Analysis ◽  
Water Supply ◽  
Negative Pressure ◽  
Water Hammer ◽  
Surge Tank ◽  
Proper Place ◽  
Column Separation ◽  
Important Measure ◽  
Engineering Principle

One-way surge tank is an important measure of water hammer protection in long water supply engineering. It can control the negative pressure efficiently and prevent pipeline from column separation. Setting one-way surge tank in proper place along pipeline is relative to the safety of long water supply engineering. Principle of Setting one-way surge tank is made through theoretical analysis detailedly. It is obviously that result of theoretical analysis is conservative because attenuation of water hammer is ignored, but theoretical analysis provide an proper approach for setting one-way surge tank. Based on result of theoretical analysis, optimization setting is obtained through numerical simulation.

scholarly journals A study of the numerical simulation of water hammer with column separation and cavity collapse in pipelines

2017 ◽  
Vol 9 (9) ◽  
pp. 168781401771812 ◽  
Author(s):  
Enbin Liu ◽  
Dandan Wen ◽  
Shanbi Peng ◽  
Haiyang Sun ◽  
Yi Yang
Keyword(s):  
Numerical Simulation ◽  
Water Hammer ◽  
Cavity Collapse ◽  
Column Separation

Numerical simulation and optimization on valve-induced water hammer characteristics for parallel pump feedwater system

2008 ◽  
Vol 35 (12) ◽  
pp. 2280-2287 ◽  
Author(s):  
Wenxi Tian ◽  
G.H. Su ◽  
Gaopeng Wang ◽  
Suizheng Qiu ◽  
Zejun Xiao
Keyword(s):  
Numerical Simulation ◽  
Water Hammer ◽  
Simulation And Optimization

Experimental and Numerical Simulation of Water Hammer

2014 ◽  
Vol 39 (4) ◽  
pp. 2669-2675 ◽  
Author(s):  
M. R. Nikpour ◽  
A. H. Nazemi ◽  
A. Hosseinzadeh Dalir ◽  
F. Shoja ◽  
P. Varjavand
Keyword(s):  
Numerical Simulation ◽  
Water Hammer

Research on Coupled Water Hammer in Hydraulic Pipe System

2010 ◽  
Vol 29-32 ◽  
pp. 401-406 ◽  
Author(s):  
Jin Jun Liao ◽  
Bao Ren Li
Keyword(s):  
Numerical Simulation ◽  
Pressure Fluctuations ◽  
Mathematic Model ◽  
Water Hammer ◽  
One Dimensional ◽  
Pipe System ◽  
System Parameters ◽  
Simulation And Experiment ◽  
Pressure Characteristics

A one-dimensional mathematic model is presented which describes pressure fluctuations behavior of liquid-filled pipes. The model is based on conventional two-equations water hammer theory. Here is multi-water-hammer occurring simultaneously and coupling together. The differences are obvious when taking into account coupled water hammer and just single water hammer in Fluid pipe system by comparing the numerical simulation. The pressure characteristics located where water hammer takes place is investigated by numerical simulation and experiment. Then the factors of influencing on the coupled water-hammer pressure and frequency are considered, the result shows that system parameters effecting on it are critical and should be detailedly analyzed.

Numerical Simulation and Analysis of Hydraulic Excitation System Based on Water Hammer by the Method of Characteristics

2011 ◽  
Vol 295-297 ◽  
pp. 2210-2215 ◽  
Author(s):  
Hui Xian Zhang ◽  
Zi Ming Kou ◽  
Juan Wu ◽  
Chun Yue Lu
Keyword(s):  
Numerical Simulation ◽  
Method Of Characteristics ◽  
Experimental System ◽  
Water Hammer ◽  
Vibration Exciter ◽  
Transient Pressure ◽  
Excitation System ◽  
The Method Of Characteristics ◽  
System Pressure ◽  
Excitation Pressure

To study artificially produced and actively controlled water hammer wave caused by hydraulic vibration exciter, a mathematical model was established and an experimental system was designed to verify it. Through the given partial differential equations, a computer code based on the method of characteristics was developed to calculate transient pressure distributed along the pipe under different rotational frequency of vibration exciter. The numerical simulation indicates that there is a simple harmonic vibration rising at the cross sections along the pipe, corresponding to different excitation pressure at every cross section. In addition, the excitation pressure can also be adjusted by system pressure via overflow valve. So, this work is expected to serve for the optimum design of the hydraulic excitation system and play a theoretical guiding role to experimental research in future.

Large Water‐Hammer Pressures for Column Separation in Pipelines

1991 ◽  
Vol 117 (10) ◽  
pp. 1310-1316 ◽  
Author(s):  
Angus R. Simpson ◽  
E. Benjamin Wylie
Keyword(s):  
Water Hammer ◽  
Column Separation ◽  
Large Water

Simulation of Vaporous and Gaseous Cavitation

1984 ◽  
Vol 106 (3) ◽  
pp. 307-311 ◽  
Author(s):  
E. Benjamin Wylie
Keyword(s):  
Numerical Simulation ◽  
Free Gas ◽  
Transient Flows ◽  
Column Separation

A discrete free gas model is presented for numerical simulation of transients in liquids containing free gas. The model is also able to simulate vapor column separation during liquid transient flows in pipelines. The latter application may be the most significant attribute of the model.

Water Hammer and Column Separation Due to Accidental Simultaneous Closure of Control Valves in a Large Scale Two-Phase Flow Experimental Test Rig

2010 ◽  
Author(s):  
Anton Bergant ◽  
Jos M. C. van ’t Westende ◽  
Tiit Koppel ◽  
Janez Gale ◽  
Qingzhi Hou ◽  
...  
Keyword(s):  
Large Scale ◽  
Water Hammer ◽  
Water Levels ◽  
Test Rig ◽  
Two Phase ◽  
Transient Event ◽  
Control Valves ◽  
Column Separation ◽  
Pipe Joints ◽  
Large Water

A large-scale pipeline test rig at Deltares, Delft, The Netherlands has been used for filling and emptying experiments. Tests have been conducted in a horizontal 250 mm diameter PVC pipe of 258 m length with control valves at the downstream and upstream ends. This paper investigates the accidental simultaneous closure of two automatic control valves during initial testing of the test rig. The simultaneous closure of both valves has induced upsurge and downsurge at the same time. Large water hammer and column separation have caused failure of pipe supports and leakage at pipe joints. The incident was caused by a fault in an electronic conversion box due to power failure. Afterwards the downstream end automatic valve has been modified to a manually operated valve to avoid the accidental simultaneous closure of the valves. The accidental transient event has been fully recorded with pressures, flow rates and water levels. The measurements of the accident are presented, analyzed and discussed in detail. Photographs show the damages to the system.

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