|
|
|
| Experimental study on direct water hammer pressure characteristics in PMMA pipelines |
| ZHANG Xiaoying1*, BIAN Shaokang1, FENG Mengxue2, LU Wei2, ZHANG Jian3 |
| 1. College of Hydraulic and Civil Engineering, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China; 2. China Water Resources Pearl River Planning, Surveying & Designing Co., Ltd., Guangzhou, Guangdong 510610, China; 3. College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing, Jiangsu 210098, China |
|
|
|
| Guide |
|
|
Abstract To understand the water hammer pressure characteristics of viscoelastic pipelines, a series of shut-off valve water hammer tests were conducted by construction of a reservoir-pipeline-valve system model. The direct water hammer pressure change law generated by the shut-off valve for the PMMA pipeline at the initial opening were 30%, 100% of the end valves were studied. From the perspective of the constitutive relationship of viscoelastic materials, the influence mechanism of valve closing time on the direct water hammer of viscoelastic materials was analyzed The 3D numerical simulations were conducted on the flow field at two different initial openings near the valve. The results show that the variation of direct water hammer pressure in viscoelastic pipelines is inconsistent with traditional water hammer theory. Direct water hammer pressure is not only related to the valve closing time but also to the valve initial opening time. The laws of ″The faster the valve closes, the greater the direct water hammer pressure″ and ″The smaller the initial opening of the valve, the greater the direct water hammer pressure″ are met.
|
|
Received: 11 October 2022
|
| Fund: |
|
|
|
|
|
|
