对称边界条件下气泡脉动特性实验研究
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摘要
采用铜丝电极低电压条件下打火生成气泡方法,配合高速摄影技术研究两平行板间与筒状区域构成的对称边界附近气泡脉动特性。气泡生成位置位于两平行板与筒状区域中心。气泡在两平行板间运动时,气泡会在中间撕裂成两小气泡,形成的两小气泡射流方向相反,且指向平行板。随两平行板间无量纲距离的减小,依次出现回弹撕裂、相背射流及连通射流等不同坍塌运动形式。气泡在圆、方筒中运动时会形成"红细胞"型及对射流,对射流穿透气泡形成环形气泡继续坍塌,射流方向指向筒壁。通过对称边界条件下气泡运动特性研究,旨在为不同边界条件下气泡坍塌形式提供参考。
The bubble motions between two parallel plates and in cylinder region were studied experimentally with low-voltage electric spark bubble generator and high-speed camera.Bubbles were generated at the center of the region to ensure its symmetric motion.Between the parallel plates,the bubble will be teared apart from the middle into two smaller bubbles,forming two jets with opposite directions towards the plates.As the dimensionless distance between the two plates decreases,the following three motion patterns are observed:rebound and split,adverse jet,and connected jet.In circular cylinder and square cylinder regions,the bubble evolves into the one with red blood cell shape and a ring-bubble is generated at the end of jetting and jets towards cylinder wall.The study on bubble motion characteristics presented here gives a useful reference to the researches on bubble collapse patterns near different types of boundaries.
The bubble motions between two parallel plates and in cylinder region were studied experimentally with low-voltage electric spark bubble generator and high-speed camera.Bubbles were generated at the center of the region to ensure its symmetric motion.Between the parallel plates,the bubble will be teared apart from the middle into two smaller bubbles,forming two jets with opposite directions towards the plates.As the dimensionless distance between the two plates decreases,the following three motion patterns are observed:rebound and split,adverse jet,and connected jet.In circular cylinder and square cylinder regions,the bubble evolves into the one with red blood cell shape and a ring-bubble is generated at the end of jetting and jets towards cylinder wall.The study on bubble motion characteristics presented here gives a useful reference to the researches on bubble collapse patterns near different types of boundaries.
引文
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[2]Bubbles A P.Physics of fluids[J].2004,16(6):1852-1865.
[3]王诗平,程晓达,张阿漫,等.气泡与球鼻艏结构相互作用实验研究[J].振动与冲击,2012,32(22):96-100.WANG Shi-ping,CHENG Xiao-da,ZHANG A-man,et al.Tests for interaction of underwater bubbles and a ship bulbous bow[J].Journal of Vibration and Shock,2012,32(22):96-100.
[4]Lauterborn W,Bolle H.Experimental investigations of cavitation-bubble collapse in the neighborhood of a solid boundary[J].Journal of Fluid Mechanics,1975,72(2):112
[5]Philipp A,Lauterborn W.Cavitation erosion by single laserproduced bubbles[J].Journal of Fluid Mechanics,1998,361:75-116.
[6]Blake J R,Gibson D C.Cavitation bubbles near boundaries[J].Annual Review of Fluid Mechanics,1987,19:99-123.
[7]Fong S W,Adhikari D,Klaseboer E,et al.Interaction of multiple spark-generated bubbles with phase differences[J].Experimental Fluids,2009,46(4):705-724.
[8]高波,张寒虹,张弛.水中高压放电气泡的实验研究[J].物理学报,2003,52(7):1714-1719.GAO Bo,ZHANG Han-hong,ZHANG Chi.Experimental investigation of bubbles by underwater wire exploding[J].Acta Physica Sinica,2003,52(7):1714-1719.
[9]张阿漫,王诗平,白兆宏,等.不同环境下气泡脉动特性实验研究[J].力学学报,2011,43(1):71-83.ZHANG A-man,WANG Shi-ping,BAI Zhao-hong,et al.Experimental study on bubble pulse features under different circumstances[J].Chinese Journal of Theoretical and Applied Mechanics,2011,43(1):71-83.
[10]Krefting D,Lauterborn M R.High-speed observation of acoustic cavitation erosion in multibubble systems[J].Ultrasonics Sonochemistry,2004,11(3/4):119-123.
[11]Klaseboer E,Hung K C,Wang C,et al.Experimental and numerical investigation of the dynamics of an underwater explosion bubble near a resilient/rigid structure[J].Journal of Fluid Mechanics,2005,537:387-413.
[12]Ni Bao-yu,Zhang A-man,Wang Qian-xi,et al.Experimental and numerical study on the growth and collapse of a bubble in a narrow tube[J].Acta Mechania Sinica,2012,28(5):1248-1260.
[13]宗智,何亮,孙龙泉.水下爆炸气泡对水面舰船载荷的数值研究[J].船舶力学,2008,12(5):733-739.ZONG Zhi,HE Liang,SUN Long-quan.Numerical study of loading on the surface ship near an underwater explosion bubble[J].Journal of Ship Mechanics,2008,12(5):733-739.
[14]张阿漫,姚熊亮.近自由面水下爆炸气泡的运动规律研究[J].物理学报,2008,57(1):339-353.ZHANG A-man,YAO Xiong-liang.The law of the underwater explosion bubble motion near free surface[J].Acta Physica Sinica,2008,57(1):339-353.
[15]Kucherenko V V,Shamko V V.Dynamics of electricexplosion cavities between two solid parallel walls[J].Journal of Applied Mechanics and Technical Physics,1986,27(1):112-115.
[16]Zhang A-man,Ni Bo-yu,Song Bing-yue,et al.Numerical simulation of bubble breakup phenomena in a narrow flow field[J].Applied Mathematics and Mechanics,2010,31(4):449-460.