高扩散低收缩差动坎高坎空中挑射水舌运动特性  

Study on dynamic characteristics of water jet in hybrid type flip bucket

作　　者：张挺[1] 麦栋玲[1] 

机构地区：[1]福州大学土木工程学院,福建福州350002

出　　处：《福州大学学报（自然科学版）》2008年第3期450-454,共5页Journal of Fuzhou University(Natural Science Edition)

基　　金：福建省自然科学基金资助项目(E0710013);福建省教育厅科研资助项目(JB06060);福州大学发展基金资助项目(0050826031)

摘　　要：采用k-ε双方程紊流模型,对高扩散低收缩差动式挑坎空中挑射水舌进行了三维数值模拟,给出了扩散高坎空中挑射水舌的扩散规律、流速分布等结果,并与连续式挑坎空中挑射水舌运动特性进行对比分析,二者趋势吻合很好.结果表明：扩散高坎水舌沿程空中垂向扩散规律满足线性分布,其扩散厚度比连续式挑坎小;扩散高坎水舌截面速度分布规律与连续式挑坎相似,均近似符合正态分布,但速度沿水深方向较连续式分布更均匀.This paper performed the 3D numerical simulation to the hybrid type flip bucket, in which k - ε binary equation turbulence model was used to simulate the water jet. Some hydraulic characteristics of bucket were given, such as the diffusion of the water jet, the velocity distributions and so on. Moreover, the results were compared with the data of continuous flip bucket and indicated that they were in good agreement. The results demonstrated that the water jet vertical - diffusion of diffusive flip bucket conformed to the line regularity and its thickness was smaller than the continuous flip bucket. Like the continuous flip bucket, the velocity distributions of diffusive flip bucket accorded with normal school, but more uniformed than the continuous flip bucket.

关 键 词：差动坎 空中扩散 挑射水流 紊流模型 

分 类 号：TV653[水利工程—水利水电工程]