| 泄洪闸胸墙压坡段的数值模拟 |
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| 引用本文： | 岳书波,张鸿清,刁明军,代尚逸.泄洪闸胸墙压坡段的数值模拟[J].排灌机械工程学报,2019,37(6):491-497. |
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| 作者姓名： | 岳书波 张鸿清 刁明军 代尚逸 |
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| 作者单位： | 1. 浙江省水利河口研究院, 浙江 杭州 310020; 2. 四川大学 水力学与山区河流开发保护国家重点实验室, 四川 成都 610065; 3. 中国市政工程西南设计研究院, 四川 成都 610065 |
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| 摘 要： | 采用RNG k-ε紊流数值模型对具有不同坡度的胸墙压坡段的泄洪闸出口水流进行了三维数值模拟.通过数值模拟计算得到了具有4种不同坡度的泄洪闸胸墙压坡段的流线、流速和压力,并对比分析了胸墙压坡段坡度变化对泄洪闸泄流能力、水流脱壁情况、负压分布区域的影响情况.研究结果表明:随着胸墙压坡段坡度的增大,虽然闸口的泄流能力减弱,但是出口水流的脱空长度和脱空高度变小,也即增大胸墙压坡段的坡度使得出口水流的脱壁现象减弱直至消失;胸墙压坡段内的负压最值及负压的分布区域均随着坡度的增大而变小.在泄洪闸胸墙底缘压坡段的设计过程中要避免平坡式链接,可通过合理的方式比选出适用于自身工程的压坡坡度,有利于提高消力池的消能效率,避免压坡段的空化空蚀,从而增强了工程的安全性.研究方法和结果对类似工程的优化设计及安全运行具有一定的指导意义.
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| 关 键 词： | 泄洪闸 胸墙压坡段 流量系数 水流脱壁现象 数值模拟 |
| 收稿时间： | 2017-12-12 |
Numerical simulation of breast wall with pressure section of spillway sluice |
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| YUE Shubo,ZHANG Hongqing,DIAO Mingjun,DAI Shangyi.Numerical simulation of breast wall with pressure section of spillway sluice[J].Journal of Drainage and Irrigation Machinery Engineering,2019,37(6):491-497. |
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| Authors: | YUE Shubo ZHANG Hongqing DIAO Mingjun DAI Shangyi |
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| Institution: | 1. Zhejiang Institute of Hydraulic and Estuary, Hangzhou, Zhejiang 310020, China; 2. State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, Sichuan 610065, China; 3. Southwest Municipal Engineering Design and Research Institute of China, Chengdu, Sichuan 610065, China |
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| Abstract: | The RNG k-ε turbulent numerical model was adopted to simulate the flow characteristic of the breast wall with different slope pressure sections at the exit of the spillway sluice. The streamline, the flow velocity and the pressure were obtained to analyze the different influences of the different slopes on the discharge capacity of the spillway, the phenomenon of current off the wall and the distribution of the negative pressure. The results show that the discharge capacity is weakened, the phenomenon of current off the wall is avoided, and the maximum and distribution area of the negative pressure are lessened, when the slope of the pressure section becomes sharp. Flat slope type should be avoided in the design process. By a reasonable way, we can select a suitable type for a project is beneficial to improve the efficiency of energy dissipation of stilling basin and avoid the cavitation erosion of the pressure slope section, so as to enhance the security of the project. The results and the methods can provide particular guidance to the optimization design and operation of the similar projects. |
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| Keywords: | spillway sluice breast wall with pressure section discharge coefficient phenomenon of current off the wall numerical simulation |
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