HUANGWei,ZUZi-hao,LIHuo-kun,et al.Evaluation of Protective Performance of Water Hammer in Water Diversion Project with Negative Head and Large Flow Rate[J].China Water & Wastewater,2024,40(21):59-66.
Evaluation of Protective Performance of Water Hammer in Water Diversion Project with Negative Head and Large Flow Rate
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第40卷
Number:
第21期
Page:
59-66
Column:
Date of publication:
2024-11-01
- Keywords:
- negative head; pump-stopping water hammer; air valve; air-valve surge tank; water hammer protection
- Abstract:
- In long-distance water diversion projects characterized by negative head and large flow rate, the occurrence of water hammer-induced accidents poses a significant threat to the safe operation of pipelines. Therefore, selecting an appropriate protective scheme is of paramount importance. In conjunction with the actual project, the novel combined scheme of air valves and air-valve surge tank (AVST) for pump stop water hammer protection was numerically simulated using the characteristic line method and orthogonal test approach. Additionally, the impact of varying air valve diameters, inflow and outflow coefficients, as well as the size of standpipe in the AVST on the hydraulic control performance was analyzed. The air valve had an appropriate diameter to effectively mitigate negative pressure and control positive pressure. It is important to note that a larger or smaller size does not necessarily yield better performance. The combined protection system comprising both air valve and AVST effectively maintained negative pressure below -2 m, demonstrating superior performance compared to a standalone air valve. This approach represents a highly economical and efficient solution for mitigating water hammer. In comparison to other factors, the height of standpipe in the AVST exerted a significant influence on the effectiveness of water hammer protection. Therefore, selecting an appropriate standpipe size was crucial for mitigating water hammer.
Last Update:
2024-11-01