In the online fission gas removal system applied to TMSR, the venturi bubble generator was developed to produce the dispersed bubbles from the reactor coolant. It is essential to establish the critical condition of bubble breakup for the bubble generation. Numerical simulations of the bubble dynamics in an unsteady turbulent flow in the bubble generator are performed with Volume-of-fluid (VOF) and Large-eddy-simulation (LES). The flow fields with similar turbulent characteristics in the bubble generator are established in the cavity to track the bubble dynamics. The dynamic boundary conditions are set to simulate the bubble dynamics in the two patterns of flow including shearing flow and rotational flow. The critical Weber number of the bubble ranges from 0 to 10. Weber number is always fluctuating in a certain range before bubble breakup. The dynamic characteristics of the bubble shape factor in this complex unsteady flow can be modeled by a one-dimensional damped oscillator model. The bubble oscillation in unsteady turbulence can be predicted by combining the dimensionless number of time and the Weber number.

在应用于TMSR的在线裂变气体去除系统中，开发了文丘里管气泡发生器，以从反应堆冷却剂中产生分散的气泡。建立气泡破裂的临界条件对于气泡的产生是至关重要的。气泡产生器中非稳态湍流中气泡动力学的数值模拟是通过流体体积（VOF）和大涡模拟（LES）进行的。在空腔中建立气泡发生器中具有相似湍流特性的流场，以跟踪气泡动力学。设置动态边界条件以模拟两种流动模式（包括剪切流和旋转流）中的气泡动力学。气泡的临界韦伯数在0到10之间。气泡破裂前，韦伯数始终在一定范围内波动。可以通过一维阻尼振荡器模型来模拟这种复杂的非恒定流中气泡形状因子的动态特性。通过结合无量纲的时间数和韦伯数，可以预测非定常湍流中的气泡振荡。