Research on Water Hammer Characteristics of Long Distance Water Supply System with High Fall Head
Author(s): JIANG Xiaopeng, JIE Shaopeng
Pages: 103-106
Year: 2015 Issue: 11
Journal: Yellow River
Keyword: high fall; gravitational water-supply project; water hammer; energy dissipation;
Abstract: In the high fall gravitational water-supply projects, to avoid the high static pressure happening in the downstream pipeline during operation dispatching, methods commonly used are setting multistage energy-dissipating measures along the pipeline, and calculation and analysis of water hammer must be done when the valve of gravity flow pipeline opening or closing. Based on the simplified energy dissipation box physical model and the characteristic method, the mathematical model of the energy dissipation box and the characteristic line equation for calculation and analysis of water hammer were put forward in this paper. Combined with practical work, the paper analyzed the hammer characteristics of the high fall gravitational water-supply project in the process of valve opening and closure. The calculation results show that the valve opening process in high fall gravitational system is relatively safe and the minimum pressure along the pipeline is mainly determined by the initial internal water pressure, which is little related to valve open velocity, so the minimum pressure along the pipeline can be effectively controlled by increasing the initial internal water pressure. The valve closure process is more dangerous than that in the normal gravitational water-supply protects and the first-phase water hammer happens easily, so the valve closure velocity must be strictly controlled.
Pages: 103-106
Year: 2015 Issue: 11
Journal: Yellow River
Keyword: high fall; gravitational water-supply project; water hammer; energy dissipation;
Abstract: In the high fall gravitational water-supply projects, to avoid the high static pressure happening in the downstream pipeline during operation dispatching, methods commonly used are setting multistage energy-dissipating measures along the pipeline, and calculation and analysis of water hammer must be done when the valve of gravity flow pipeline opening or closing. Based on the simplified energy dissipation box physical model and the characteristic method, the mathematical model of the energy dissipation box and the characteristic line equation for calculation and analysis of water hammer were put forward in this paper. Combined with practical work, the paper analyzed the hammer characteristics of the high fall gravitational water-supply project in the process of valve opening and closure. The calculation results show that the valve opening process in high fall gravitational system is relatively safe and the minimum pressure along the pipeline is mainly determined by the initial internal water pressure, which is little related to valve open velocity, so the minimum pressure along the pipeline can be effectively controlled by increasing the initial internal water pressure. The valve closure process is more dangerous than that in the normal gravitational water-supply protects and the first-phase water hammer happens easily, so the valve closure velocity must be strictly controlled.
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