摇摆运动下大空间内气泡浮升运动研究

Study of bubble buoyant movement in a large space under rolling motion

气泡的浮升运动在除氧器和鼓泡塔饱和池式沸腾换热设备中非常常见.摇摆运动是一种最为常见的海洋条件,由于附加惯性力的存在,摇摆运动会对气泡的浮升运动产生一定的影响.文中对大容积内摇摆运动下的气泡浮升运动进行了理论分析,建立了摇摆运动下浮升运动气泡的受力模型,并根据该模型进行了数值计算.计算结果表明:摇摆运动下的气泡浮升运动与静止条件有很大的不同;气泡的运动轨迹、运动速度与摇摆运动的周期、振幅和初始相位有关;此外,系统的布置也会对气泡的浮升运动产生很大的影响.

Bubble buoyant movement occurs frequently in a variety of pool boiling heat exchangers and facilities, such as natural circulation steam generator and steam jet deaerator. Rolling motion is one of the most common ocean conditions. In order to get an understanding of the effects of the additional inertial force caused by rolling motion on bubble rising velocity and trajectory, the buoyant movement of gas bubble under rolling motion in an extensive liquid pool was theoretically analyzed in this work. Bubble force model under rolling motion was ob- tained, based on some assumptions, to calculate the parameters relative to the bubble dynamics in a relatively large containment. The results indicated that the buoyant movement of gas bubble was totally different between rolling motion condition and static condition in large space. Bubble rising velocity and trajectory were affected by the rolling period and amplitude, as well as the initial rolling phase. In addition, the impact of the system arrangements on bubble buoyant movement was also studied.