摘要
消能工体型的选择在水利工程设计中至关重要。采用RNG k-ε紊流模型与VOF方法对泄洪过程中溢洪道与水垫塘内的水流进行水气二相流三维数值模拟,研究窄缝型挑坎消能工的水流特点及规律,结果显示,数值模拟计算的水深、水流流态、入水角度等参数与模型试验结果吻合较好,验证了数值模拟的可行性。在此基础上,计算分析了窄缝型挑坎收缩段水流及空中水舌的水力特性,以及水垫塘底板压强分布规律,确定出窄缝型挑坎最大压强所在位置及空中水舌流速变化规律。研究结果表明:窄缝型挑坎束窄水流作用明显,其空中水舌同一横断面的最大流速位置基本相同,同一纵向断面垂向流速差沿程逐渐减小,挑坎收缩段底板处流速大小呈抛物线形分布,而压强分布沿程呈现3个区间3个趋势的分布规律。研究成果可为实际工程中同类型消能工的设计提供参考。
The choice of energy dissipater types is crucial to the design of water conservancy projects.Here,the characteristics and variation patterns of water flow in the slot-type flip bucket in the discharge process are studied using RNG k-εturbulence model and volume of fluid(VOF)method for the simulation of the three-dimensional water gas two-phase flow in the spillway and plunge pool.The results show that the water depth,flow pattern and flow angle of the numerical simulation results are in good agreement with those of the physical model test,which verifies the feasibility of the numerical simulation.On this basis,the shape and position of the water tongue in the air,the flow velocity in the contraction section of the slot,the pressure distribution law and the characteristics of the outgoing flow field are analyzed,with which the position of the maximum pressure at the slot and the variation law of the water tongue velocity in the air are determined.The results indicate that the narrowing effect of the slot-type flip bucket is obvious,the positions of the maximum water tongue velocity in the air are basically the same,and the velocity difference at each point at the same vertical position decreases along the way.The velocity at the bottom plate of the slot section of the spillway shows a parabolic distribution law,whereas the pressure shows a distribution law of three intervals and three trends.The research results can provide a reference for the design of energy dissipaters of the same type in practical engineering projects.
作者
马琳
夏鹏飞
胡江
郝小鸟
MA Lin;XIA Pengfei;HU Jiang;HAO Xiaoniao(Yangling Vocational&Technical College,Yangling 712100,China;Nanjing Hydraulic Research Institute,Nanjing 210029,China;Xinchang County Water Resources and Hydropower Bureau,Shaoxing 312500,China)
出处
《水资源与水工程学报》
CSCD
北大核心
2022年第4期149-155,共7页
Journal of Water Resources and Water Engineering
基金
国家自然科学基金项目(51879169)。
关键词
窄缝型挑坎
水舌
溢洪道
数值模拟
水气二相流
VOF法
slot-type flip bucket
water tongue
spillway
numerical simulation
water gas two-phase flow
volume of fluid(VOF)method
