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环形与圆形喷管水下气泡生成的实验对比研究

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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
投稿时间:2016-05-27
DOI:10.15918/j.tbit1001-0645.2017.08.001
中文关键词:水下气泡生成环形喷管圆形喷管上浮高度气泡受力
English Keywords:submerged bubble formationannular nozzlecircular nozzlefloating heightforce of bubbles
基金项目:国家自然科学基金资助项目(11372041)
作者单位
胡俊北京理工大学 宇航学院, 北京 100081
李婷婷北京理工大学 宇航学院, 北京 100081
于勇北京理工大学 宇航学院, 北京 100081
姜建玉北京理工大学 宇航学院, 北京 100081
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中文摘要:
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.
English Summary:
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-2 and period-3, while the annular nozzle exhibits only period-3 bubbling regime features when the gas can be ejected stably from the entire annular section. In period-3 bubbling 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.
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