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为模拟地震对反应堆堆芯内两相流动的影响,将振动产生装置与实验段结合,并利用电导探针技术实验研究了振动工况下环管内气液两相流局部参数的分布特性。振动装置所采用的偏心轮的偏心距为15.875mm,并可通过调节电机转速获得不同的振动周期。环管实验段内径和外径分别为19.1mm和38.1mm,总长度为2.32m。实验以空气和水为工质,流动工况覆盖了泡状流、弹状流及搅混流等流型。实验结果表明,振动对管内气液两相流局部参数如含气率和界面浓度等分布具有重要影响。随振动周期的减小,管内两相流参数分布发生明显变化。另外振动对低含气率的泡状流影响较大,随含气率的增加,流型逐渐向搅混流过度,振动对两相流参数的影响逐渐减小。
In order to simulate the influence of earthquakes on the two-phase flow in the reactor core, the vibration generating device was combined with the experiment section. The distribution characteristics of the local parameters of gas-liquid two-phase flow in the loop tube under vibration were experimentally studied by using the conductivity probe technology. The eccentricity of the eccentric used in the vibration device is 15.875mm, and different vibration cycles can be obtained by adjusting the motor speed. The inner diameter and outer diameter of the experimental section of the loop were 19.1mm and 38.1mm, respectively, with a total length of 2.32m. Experiments with air and water as the working fluid, flow conditions covered bubble flow, slug flow and mixing flow flow pattern. The experimental results show that the vibration has an important influence on the distribution of partial parameters of gas-liquid two-phase flow in the pipe, such as gas content and interface concentration. With the decrease of vibration period, the parameter distribution of two-phase flow in the tube changes obviously. In addition, the vibration has a great influence on the bubbly flow with low gas content. With the increase of the gas content, the flow pattern gradually flows into the mixing flow, and the influence of vibration on the two-phase flow parameters decreases gradually.