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| Water filling and emptying process of pipeline with combined air valve |
| ZHENG Yuan-1, XUE Chao-2, ZHOU Da-Qing-1 |
| (1.College of Energy and Electrical Engineering, Hohai University, Nanjing, Jiangsu 210098, China; 2.College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing, Jiangsu 210098, China) |
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Abstract In order to research the air pressure changes in water filling and emptying process of a long distance pressuredpipeline,sectional treatment and ordinal water filling and water emptying were adopted according to the characteristics of the pressuredpipeline.For each segment of the circular pipe,a mathematical model which involved the relationship between the water volume and water depth was established.On the basis of the definite positions of air valves and drain pipes as well as with the principle of small flow filling, the ideal equation concerning with the characteristics of air valve were calculated by Fortran programmed code for the various flow rates of both water filling and water emptying.The results show that the greater flow rate of the water filling and water emptying,the higher and lower the corresponding air pressure,and the higher risk of the pipe.The greater flow rate of water filling and water emptying should be accepted on the premise that the pipe is safe.The final filling flow rate is 16 m3/s,and the drain valves are full opening during water emptying process.
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Received: 17 August 2010
Published: 30 January 2012
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