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| DOI：10.13522/j.ggps.cnki.20180272 |
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| Using CFD Model to Analyze the Influence of Geometric Parameters of Diversion Piers on Water Flow in Sluice Station |
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XU Bo， ZHANG Congcong， LI Zhanchao， GAO Chen， BI Chao
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1.School of Hydraulic, Energy and Power Engineering, Yangzhou University, Yangzhou 225127, China； 2. Jiangxi Provincial Design and Ｒesearch Institute of Water Conservancy and Hydropower， Nanchang 330029, China; 3. Jiangsu Water Conservancy Survey and Design Institute Co.,Ltd., Yangzhou 225127, China
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| Abstract: |
| 【Objective】 Water flow in the proximity of diversion pier in sluice station is complicated. The objective of this paper is to present a method to improve our understanding of slanting flow, bias flow, large transverse and axial flow in front of diversion piers in sluice stations. 【Method】The method was based on the computational fluid dynamics software (CFD), in which the influence of the length of the diversion pier, its openness, duration of openness, distance between adjacent hole and height of the opening, on flow in the sluice station was analyzed. 【Result】Considering the combined impact of transverse flow velocity, axial flow velocity and oblique flow area in front of the diversion pier, single-factor progressive analysis showed that with the increase in the length of the diversion pier, the flow velocity and the inclined flow area in front of the diversion pier first decreased followed by a fall. When the opening width increased to 4.5 m, the flow velocity in front of the pier was reduced further and the state of the pier deteriorated when the pier head was larger than 4.5 m. With the increase in the center spacing, the flow velocity in front of the diversion pier first decreased followed by a decline. When the center spacing was 6.25 m, the flow state was the best. When the opening height increased to 3.8 m, the flow velocity and the oblique flow area in front of the pier were further reduced; the flow velocity and the oblique flow area in front of the pier were further increased when the opening height was larger than 3.8 m.【Conclusion】 The navigable flow condition depends greatly on the structure of the diversion pier. The opening of the diversion pier can reduce the lateral and axial flow velocity and the oblique flow area of the surface layer of the flow surface in front of the pier head, thereby improving navigation safety. The optimal opening of the diversion pier is that the length of the diversion pier is 25 m, the opening width is 4.5 m, the adjacent hole center distance is 6.25 m, and the opening height 3.8 m. The transverse and axial flow velocity and the oblique flow area of the corresponding pier head are 0.25 m/s, 0.75 m/s and 12.56 m2 respectively. |
| Key words: combined piers and sluice stations; diversion pier; geometric parameters; navigation; flow conditions |
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