二维水槽中高速气体射流的振荡流流型研究  

Study on the Vibrating Flow Type of Submerged High-Speed Gas Jets in a Two-Dimensional Water Tank

作　　者：王晓刚[1] 王超[1] 郭强[1] 施红辉[1,2] 

机构地区：[1]浙江理工大学机械与自动控制学院,杭州310018 [2]西安交通大学流体机械国家实验室,西安710049

出　　处：《浙江理工大学学报（自然科学版）》2009年第4期613-618,共6页Journal of Zhejiang Sci-Tech University(Natural Sciences)

基　　金：国家自然科学基金项目(10672144);浙江省自然科学基金项目(Y107073)

摘　　要：为研究二维水槽中高速气体射流的振荡流流型,建立了一套操作方便、可重复性好的实验系统。利用高速摄影仪研究了水下高速气体射流的形貌,显示了气体逆流而上撞击喷口表面的回击现象,发现了在喷口附近间歇性产生的胀鼓现象。结果表明:湍流气/水界面仍然存在于过膨胀射流中;射流在回击之前总是发生多次的膨胀,并且膨胀次数越多、膨胀幅度越大,回击的强度越高,对喷口表面的蚀损就越严重;超音速工况时的回击频率约为5.3 Hz。This paper describes an experimental study on the vibrating flow characteristics of twodimensional submerged high-speed gas jets. A convenient and repeatable experimental system is established. By using a high-speed camera, the image of flow patterns for the high-speed gas jets in water is obtained and the so-called back-attack and bulge phenomenon are found. The experimental results indicate that, the turbulent boundary of the gas-water still exists in over-expanded jet. Bulging of jet occurs many times before occurrence of back-attack, and the intensity of back-attack increases with increasing bulge frequency and intensity. The frequency of back-attack is 5. 3Hz in case of supersonic underwater gas jet flow.

关 键 词：水下气体射流 二维水槽 回击现象 

分 类 号：O358[理学—流体力学]