| Cite this article: | 仇为鑫,张健,吴旭敏,等.空气阀在多水源高扬程供水工程中的水锤防护研究[J].灌溉排水学报,0,():-. |
| QIU Weixin,ZHANG Jian,WU Xumin,et al.空气阀在多水源高扬程供水工程中的水锤防护研究[J].灌溉排水学报,0,():-. |
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| DOI： |
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| Research on Water Hammer Protection of Air Valve in Multi-source and High-lift Water Supply Project |
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QIU Weixin,ZHANG Jian,WU Xumin,et al
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1.Huadong Engineering Corporation Limited,Powerchina;2.Hohai University
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| Abstract: |
| 【Objective】The purpose of this paper is to study the hydraulic transient characteristics and water hammer protection measures of multi-source and high-lift water supply project when the pumps lose power.【Method】The mathematical model of the water supply system was established by using the one-dimensional hydraulic transients and method of characteristic(MOC) . The free gas cavitation theory was adopted for the air valve. Quick-closing check valves were chosen to install on the outlet side of the water pump and the end of the ground section of the water lift pipe. Air valves are set up at the high points of the water supply pipeline according to the calculation results of the transition process of power-off conditions without protective measures. Meanwhile a sensitivity analysis of the air valve parameters was carried out.【Result】The results show that a large pressure drop occurred on the outlet side of the pump and the lowest internal water pressure of the water supply pipeline was seriously exceeding the standard when the protection measures has not been taken. The pump has no reversal and the minimum pressure behind the pump is not less than -5m, the minimum pressure of the water lift pipe behind the pump is not less than -5m, the maximum pressure of the water supply main pipe is not more than 160m, and the minimum pressure is not less than -5m when the protection measures has been taken.【Conclusion】The air valve can have a good control effect on the negative pressure on the outlet side of the water pump and the water supply pipeline. The research results can provide a reference for similar projects. |
| Key words: Multi water source; High-lift; Water hammer; Quick-closing check valve; Air valve; Orifice area. |
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