非淹没异侧双体丁坝水流恢复区长度计算
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摘要
丁坝恢复区长度是认识丁坝群作用尺度的一个重要指标,目前关于这方面的研究成果不多。分别基于双丁坝断面流速分布相似划分准则(准则Ⅱ)和大尺度涡不相重叠的作用尺度划分准则(准则Ⅰ)计算两种间距阈值,然后将恢复区长度转化为上述两个阈值的差,利用率定后的RNGκ-ε紊流数学模型进行数值模拟试验。建立了准则Ⅰ下的间距阈值经验公式,结合前人提出的准则Ⅱ下间距阈值的经验公式获得非淹没异侧双体丁坝恢复区长度的计算经验公式。验证结果表明,该公式计算精度较高,有一定的应用价值,可为以后河流系统中丁坝群的合理布置提供一定的参考。
The length of the flow recovery zone of spur dike is an important index in understanding the impact scale of spur dike groups, and there are no much research results on this at present. We convert the recovery zone length into the difference between two spacing thresholds, the first threshold is based on the cross-section velocity distribution principle of double spur dikes(criterion II) and the second one is obtained by large-scale vortexes nonoverlapping principle(criterion I). Through RNG k-ε turbulence mathematical model after calibrating and numerical simulation test, we establish the empirical formula of spacing threshold of criterion I. The empirical formula for calculating the length of the flow recovery zone of nonsubmerged spur dikes with alternate layout is obtained based on the empirical formula of spacing threshold under criterion II and I. The verification results of the formula show that the calculation accuracy is satisfactory and has certain value-in-use, which will provide a reference for the reasonable arrangement of the spur dike groups in the river system.
The length of the flow recovery zone of spur dike is an important index in understanding the impact scale of spur dike groups, and there are no much research results on this at present. We convert the recovery zone length into the difference between two spacing thresholds, the first threshold is based on the cross-section velocity distribution principle of double spur dikes(criterion II) and the second one is obtained by large-scale vortexes nonoverlapping principle(criterion I). Through RNG k-ε turbulence mathematical model after calibrating and numerical simulation test, we establish the empirical formula of spacing threshold of criterion I. The empirical formula for calculating the length of the flow recovery zone of nonsubmerged spur dikes with alternate layout is obtained based on the empirical formula of spacing threshold under criterion II and I. The verification results of the formula show that the calculation accuracy is satisfactory and has certain value-in-use, which will provide a reference for the reasonable arrangement of the spur dike groups in the river system.
引文
[1] 周阳.丁坝对弯道水流流态影响的试验研究[D].辽宁:沈阳农业大学,2006.
[2] 曹晓萌,顾正华.3种非淹没双体丁坝作用尺度划分准则及比较[J].浙江大学学报(工学版),2015,49(2):200-207.
[3] 彭静,河原能久.丁坝群近体流动结构的可视化试验研究[J].水利学报,2000(4):44-47.
[4] 周宜林,道上正规,桧谷治.非淹没丁坝附近三维水流运动特性的研究[J].水利学报,2004,8(8):46-53.
[5] 陆永军,周耀庭.丁坝下游恢复区流场初探[J].水动力学研究与进展,1989,4(3):70-78.
[6] 陈来华,徐有成,杨永楚.钱塘江强潮河段修建护岸丁坝技术探讨[J].水利学报,2004(4):1-6.
[7] Acharya A,Duan J G.Three Dimensional Simulation of Flow Field around Series of Spur Dikes[C]//World Environmental and Water Resources Congress,2011:2085-2094.
[8] 应强,焦志斌.丁坝水力学[M].北京:海洋出版社,2004:5-7,24-25.
[9] Azinfar H,Kells J A.Backwater prediction due to the blockage caused by a single,submerged spur dike in an open channel[J].Journal of Hydraulic Engineering,2008,134(8):1153-1157.
[10] Xiaomeng Cao,Zhenghua Gu,Hongwu Tang.Study on spacing threshold of nonsubmerged spur dikes with alternate layout[J].Journal of Applied Mathematics,2013,2013 (4):1-8.
[2] 曹晓萌,顾正华.3种非淹没双体丁坝作用尺度划分准则及比较[J].浙江大学学报(工学版),2015,49(2):200-207.
[3] 彭静,河原能久.丁坝群近体流动结构的可视化试验研究[J].水利学报,2000(4):44-47.
[4] 周宜林,道上正规,桧谷治.非淹没丁坝附近三维水流运动特性的研究[J].水利学报,2004,8(8):46-53.
[5] 陆永军,周耀庭.丁坝下游恢复区流场初探[J].水动力学研究与进展,1989,4(3):70-78.
[6] 陈来华,徐有成,杨永楚.钱塘江强潮河段修建护岸丁坝技术探讨[J].水利学报,2004(4):1-6.
[7] Acharya A,Duan J G.Three Dimensional Simulation of Flow Field around Series of Spur Dikes[C]//World Environmental and Water Resources Congress,2011:2085-2094.
[8] 应强,焦志斌.丁坝水力学[M].北京:海洋出版社,2004:5-7,24-25.
[9] Azinfar H,Kells J A.Backwater prediction due to the blockage caused by a single,submerged spur dike in an open channel[J].Journal of Hydraulic Engineering,2008,134(8):1153-1157.
[10] Xiaomeng Cao,Zhenghua Gu,Hongwu Tang.Study on spacing threshold of nonsubmerged spur dikes with alternate layout[J].Journal of Applied Mathematics,2013,2013 (4):1-8.