底掺气坎对侧空腔长度的影响  

The Effect of Base Aerator on the Length of Lateral Cavity

作　　者：刘超[1] 张光科[1] 李乃稳[1] 张光碧[1] 王海云[1] 

机构地区：[1]四川大学水利水电学院,四川成都610065

出　　处：《四川大学学报（工程科学版）》2008年第1期1-4,共4页Journal of Sichuan University (Engineering Science Edition)

基　　金：国家自然科学基金资助项目(5053906050779041);教育部博士点基金资助项目(20060610039)

摘　　要：侧空腔长度对射流挟气量及水流流态均有重要影响,采用3维数值模拟,分析了底部掺气坎尺寸对侧空腔长度的影响规律。结果表明,侧空腔长度及侧空腔形态受底部掺气坎的体型尺寸影响较大,随着底部掺气坎尺寸的增大,侧空腔长度增大,其主要原因在于底部掺气坎的尺寸会影响射流跌落至底板的位置,影响射流段动水压力的分布,从而影响射流的横向扩散速率。Based on numerical simulation, the effect of base aerator on the length of lateral cavity has been ana- lyzed. The result indicates that the size of base aerator has obvious influence on the length of lateral cavity. The bigger the base aerator is, the longer the lateral cavity. It is mainly because that, the variety of base aerator will change the pressure distributions of jet flow, which influences the diffuse velocity in the lateral direction.

关 键 词：水力学 空腔长度 数值模拟 掺气减蚀 掺气坎 侧空腔 

分 类 号：TV651.3[水利工程—水利水电工程]