环形与圆形喷管水下气泡生成的实验对比研究  

Experimental Investigation of Submerged Bubble Evolution on Annular and Circular Nozzles

作　　者：胡俊[1] 李婷婷[1] 于勇[1] 姜建玉 

机构地区：[1]北京理工大学宇航学院,北京100081

出　　处：《北京理工大学学报》2017年第8期771-777,共7页Transactions of Beijing Institute of Technology

基　　金：国家自然科学基金资助项目(11372041)

摘　　要：对环形喷管与圆形喷管水下气泡生成进行了实验对比研究.利用自行设计建设的水下气体射流实验系统,结合高速摄影仪图像记录及图像处理,比较分析了两种喷管气泡生成的异同.研究表明:对于圆形喷管,其气泡生成随气体流量增加依次呈现单周期、双周期和三周期特性;而环形喷管,在初始低流量时,气体在环形喷管出口截面呈随机无规则喷发,一旦形成稳定环形气泡则直接进入三周期区制;两种喷管在后续气泡断裂时整体气泡顶部上浮高度也不同;3类气泡所受各种力处于动态变化之中,且3类气泡所受主要控制力不同.An experimental study on bubble formation of annular and circular nozzles was carried out.The bubble formation was recorded by a high-speed camera and detailed characteristics of bubble formation were obtained.Based on the analysis of the experimental images,the similarities and differences of bubble formation in the two kinds of nozzles were explored.The results show that the bubble formation of the circular nozzle presents the law of bubbling regime,which can be divided into three periods：period-1,period-2and period-3,while the annular nozzle exhibits only period-3bubbling regime features when the gas can be ejected stably from the entire annular section.In period-3bubbling regime,when the subsequent bubble detaches from the two nozzles,the maximum heights of the whole bubble are different.The various forces acting on the bubbles are changing,and the three types of bubble are controlled by different main control forces.

关 键 词：水下气泡生成 环形喷管 圆形喷管 上浮高度 气泡受力 

分 类 号：O358[理学—流体力学]