跌坎型底流消能工附壁射流区脉动压力特性的数值模拟  

Numerical Simulation on Fluctuating Pressure Characteristics of Wall Jet Region in Step-Down Hydraulic Jump Dissipater

作　　者：黄鑫[1] 张家明 陈维亮 王彦波 覃邦民 

机构地区：[1]昆明理工大学电力学院,云南昆明650000 [2]楚雄欣源水利电力勘察设计有限责任公司,云南楚雄675000 [3]云南建工水利水电建设有限公司,云南昆明650217 [4]广西大圆工程咨询有限公司,广西南宁530000

出　　处：《昆明理工大学学报（自然科学版）》2017年第6期62-68,共7页Journal of Kunming University of Science and Technology(Natural Science)

基　　金：国家自然科学基金项目(51169008);地区科学基金项目(51669007)

摘　　要：采用RNGk-ε模型与VOF模型对跌坎型底流消能工附壁射流区内底板的脉动压力特性进行数值模拟,分析了脉动压力在该区的时域、频域特征以及沿程变化情况.结果表明:从附壁射流区起点处脉动强度沿程增强,在该区0.3D处达到最大,后又沿程衰减,在附壁区终点处脉动几乎为0,通过对9种不同水力条件工况的研究,分析出跌坎深度、入池角度、入池能量对该区脉动压力的影响,为跌坎消能工附壁区脉动破坏研究和荷载计算提供一定的参考依据.RNGk - ε turbulence model and VOF multiphase flow model were employed to simulate the fluctuating pressure of the bottom plate of wall jet region in step - down hydraulic jump dissipate. The time - domain, fre- quency- domain characteristics and the variation of the pulse pressure in the area were analyzed. The results show that fluctuant intensity enhances along the starting point of the region, the maximum at 0.3 D in this area, and then decays along the region, the fluctuant intensity at the end of the region almost reduced to 0. Based on the study of nine different hydraulic conditions, the influence of the depth of slump, the angle of the pool and the energy of the pool on the pulsating pressure in the area are analyzed. This stimulation provides a reference for the study of fluctuant damage and load calculation of the wall jet region in Step - down Hydraulic Jump Dissipater.

关 键 词：附壁射流区 脉动压力 时域分析 频域分析 数值模拟 

分 类 号：TV131[水利工程—水力学及河流动力学]