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| Water hammer of gas-liquid two-phase flow shutoff valve in pipe network |
| YANG Ruihu1,2, WANG Tong1,2, SHANG Yujun1,2, JIN Zhaogui1,2, ZHANG Miao1,2, WANG Wei1,2, JU Cai1,2, HAN Dapeng1,2 |
| 1. School of Architectural Engineering, Chang′an University, Xi′an, Shannxi 710061, China; 2. Key Laboratory of Water Supply and Drainage, Ministry of Housing and Urban-Rural Development, Xi′an, Shannxi 710061, China |
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Abstract For simulation study on pipeline gas-liquid two-phase flow valve water hammer, after simplifying the internal gas-liquid two-phase flow pattern of the water supply network, by the C++ language water hammer analysis software, taking water supply engineering tree pipe network in Lu′an, Anhui province as an example, the end valve closing water hammer calculation model was first established, then the end of valve water hammers of different combinations were simulated and calculated.The calculation results show that if the water hammer produces the end valve closing hammer in the water supply pipe, the water hammer wave will spread to the adjacent main pipe and other connected trunk pipes.When the valve of the pipe network is closed, the pressure of the valve water hammer is more than 4.5 times, so the valve water hammer is extremely harmful to the water supply works. At the end, the water hammer protection measure of ″frequency-frequency hammer control flow control valve + box two-way pressure regulating valve + ordinary exhaust valve + constant speed buffer exhaust valve″ is proposed, and its prevention effect on the end valve closing water hammer is excellent.
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Received: 11 May 2021
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