Water hammer prediction and control： the Green＇s function method

By Green＇s function method we show that the water hammer （WH） can be analytically predicted for both laminar and turbulent flows （for the latter, with an eddy vis- cosity depending solely on the space coordinates）, and thus its hazardous effect can be rationally controlled and mini- mized. To this e...

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Bibliographic Details
Published in:力学学报：英文版 2012, Vol.28 (2), p.266-273
Main Author: Li-Jun Xuan Feng Mao Jie-Zhi Wu
Format: Article
Language:English
Subjects:
合理控制
格林函数方法
水锤
流体力学
直接数值模拟
空间坐标
粘性系数
预测
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Summary:By Green＇s function method we show that the water hammer （WH） can be analytically predicted for both laminar and turbulent flows （for the latter, with an eddy vis- cosity depending solely on the space coordinates）, and thus its hazardous effect can be rationally controlled and mini- mized. To this end, we generalize a laminar water hammer equation of Wang et al. （J. Hydrodynamics, B2, 51, 1995） to include arbitrary initial condition and variable viscosity, and obtain its solution by Green＇s function method. The pre- dicted characteristic WH behaviors by the solutions are in excellent agreement with both direct numerical simulation of the original governing equations and, by adjusting the eddy viscosity coefficient, experimentally measured turbulent flow data. Optimal WH control principle is thereby constructed and demonstrated.
ISSN:0567-7718
1614-3116