Affiliation:
1. College of Water Resources Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
2. College of Civil Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Abstract
The purpose of this research is to solve the complex long-distance and high-lift water supply engineering accident water hammer protection problem. Taking the Zhaojinzhuang water supply project as an example, based on the method of characteristics (MOC), the water hammer of the pumping station under the combined action of a water hammer relief valve, hydraulic-control butterfly valve, air vessel, air valve, and other water hammer protection measures is numerically simulated and calculated, and the effectiveness of the range method is analyzed, to ensure a waterproof hammer in pump stop accidents. The results show that the main factors affecting the effect of water hammer protection under the two-stage valve-closing parameters of the hydraulic-control butterfly valve are the fast-closing angle and the slow-closing time. The arrangement of the air vessel behind the pump can effectively increase the minimum water hammer pressure in the climbing section, and with the increase of the volume of the air vessel, the pump reverse speed and the maximum positive pressure increase slightly, but the overall water hammer protection effect is better. With the increase of the moment of inertia of the motor, the maximum positive pressure and minimum negative pressure of the pipeline still do not meet the requirements of the specification, and the modification cost is relatively large. The combination of the one-stage hydraulic-control butterfly valve, the air valve, the air vessel, and the water hammer relief valve can effectively reduce the volume of the air vessel. Under the optimal method, the maximum positive pressure head is 236.61 m, and the minimum negative pressure head is −3.18 m. Compared with the original method, the maximum positive pressure head is increased by 1.18%, the minimum negative pressure head is reduced by 95.78%, the maximum reverse speed of the pump is reduced by 100%, and the maximum reverse flow of the pump is reduced by 70.27%, meeting the requirements of water hammer protection. This is a safe and economical protection method.
Funder
Free Exploration Project of Basic Research Programs of Shanxi Province, Science and Technology Department of Shanxi Province, China
Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi, Shanxi Provincial Education Department, China
School-level Scientific Research Programs of Taiyuan University Of Technology, Taiyuan University Of Technology, China
Graduate Education and Teaching Management Innovation Programs of Shanxi Province, Shanxi Provincial Education Department, China
Reference30 articles.
1. Water Hammer Analysis for Khobar-Dammam Water Transmission Ring Line;Ammar;Arab. J. Sci. Eng.,2015
2. Numerical solution for the pipe diameters and wall thickness of water hammer model using crank-nicolson algorithm;Iyanda;Trans. Niger. Assoc. Math. Phys.,2021
3. Zhang, J., Yu, X., An, J., and Hazrati, A. (2010, January 12–18). Polyline closure law design and realization in long-distance water-supply project. Proceedings of the ASME International Mechanical Engineering Congress and Exposition, Vancouver, BC, Canada.
4. Water hammer protection characteristic of combined air vessel and overpressure relief valve;Li;J. Drain. Irrig. Mach. Eng.,2020
5. Water hammer with column separation: A historical review;Bergant;J. Fluids Struct.,2006