同相气泡耦合特性实验研究

设计实验, 利用电火花打火生成 气泡来研究两个气泡之间以及两个气泡与自由面的相互作用, 在实验过程中, 精确控制打火 电路, 使两个电火花气泡的生成时间间隔控制在67\mus以内, 实现了气泡的同 相生成. 大量实验后发现, 两气泡相互作用过程中可能会出现融合、 蘑菇状气泡、对射流、射流方向逆转、反向射流等现象, 自由面附近不同安置方式的两同相气泡会出现不同 的脉动形式. 通过系列实验提出了气泡之间的无量纲距离、无量纲周期差等参数来描述气泡 耦合特性, 为气泡群的相互作用提供实验依据. }

EXPERIMENTAL STUDY ON INTERACTION OF INPHASE BUBBLES

The study of bubble-bubble interaction has many valuable applications in fields of fluid mechanics. But there are still many difficulties in theoretical and numerical studies presently.Therefore,experiments using electronic spark to generate bubbles are designed in this paper to investigate the interactions of two bubbles and bubbles with free surface.The experiments are carefully controlled and the two bubbles are generated within 67μs which can be considered as inphase.Many phenomena can be found such as fusion,mushroom shape and split,jetting toward,jetting direction change,jetting away and so on.Two feature parameters,dimensionless distance and period difference,are concluded to classify the phenomena of two inphase bubbles interaction, which aims to offer experimental references to the study of multi- bubble interactions.