摘要
针对狭窄弯曲型河道,泄水建筑物末端布置传统的连续式挑流鼻坎,出挑水流直冲对岸,既威胁岸坡安全、水舌也难以平顺归河。通过RNG k-ε紊流模型和Tru-VOF法,对扭切式挑流鼻坎出坎水舌及空间形态进行三维数值模拟。研究表明,扭切式鼻坎的大角度挑射使出挑水舌竖向拉开明显,左侧边墙的偏转能够保证出坎水流发生横向翻卷,使水舌落点导向右侧河床,在有效适应下游河谷地形变化的同时,能够减轻对下游河道的冲刷并改善雾化现象。模拟成果还表明,扭切式鼻坎出口附近最小空穴数σ=0.60,空蚀破坏不易发生。
In view of narrow and bending rivers,traditional continuous flip bucket is set at the end of discharge structure,and jet stream directly hits bank slope,threatening safety of buildings,and the jet nappe is difficult to return to river smoothly. The water nappe and spatial shape of jet nappe of contorted & cut flip bucket was simulated with three-dimension through RNG k-εturbulence model and Tru-VOF method. Research showed that large-angle shooting of bucket made jet stretch vertically,deflection of left side wall could ensure that water flow out of bucket would overturn horizontally so that water nappe was lead to right riverbed. It could adapt to changes in topographical conditions of downstream river valley,and reduce erosion of downstream river channel effectively,reduce fogging phenomenon simultaneously. Simulation results also showed that the minimum number of cavity σ near the exit of bucket was 0. 60,and it was less prone to cavitation damage.
作者
吴锦钢
邱勇
周鑫宇
王文兵
徐嘉
WU Jingang;QIU Yong;ZHOU Xinyu;WANG Wenbing;XU Jia(College of Water Conservancy,Yunnan Agricultural University,Kunming Yunnan 650201,China)
出处
《农业工程》
2021年第5期93-97,共5页
AGRICULTURAL ENGINEERING
基金
云南省教育厅科学研究基金项目(2020Y0180)。
关键词
水舌空间形态
水力特性
水流偏转
扭切式鼻坎
挑流消能
spatial shape of water nappe
hydraulic characteristics
deflection of water flow
contorted&cut flip bucket
skijump energy dissipation
作者简介
吴锦钢,硕士生,主要从事工程水力学研究。E-mail:1132853372@qq.com;通信作者:邱勇,教授,主要从事工程水力学研究。E-mail:13108854817@126.com。
