The gas-liquid flow regimes transition mechanism and bubble behavior in gas-liquid two-phase impinging jet reactor are studied by numerical method. The liquid phase velocity, gas-liquid flow regimes, bubble behavior in the impinging reactor under different gas and liquid velocities are analyzed to explore. The vortex in flow field changes periodically, and the period is 7.5 s. According to the dispersion mode of bubbles in the reactor, the gas-liquid flow regimes can be divided into three regimes: cluster upflow, gradual dispersion and complete dispersion. The critical condition equations of flow regimes transition are established combination of Flow number (Fl) and Froude number (Fr). The distribution range of bubble diameter in the reactor increases with the increase of gas velocity and decreases with the increase of liquid velocity. The turbulent kinetic energy, turbulent dissipation rate and the velocity in the flow field are gradually weakens from the impact center to the radial direction. Based on dimensionless analysis, the mathematical model of bubble Sauter diameter is established to predict bubble Sauter diameter accurately. This research provides a theoretical basis for the amplification and optimization of reactors.

采用数值方法研究了气液两相冲击射流反应器中气液流态转变机理和气泡行为。对不同气液速度下冲击反应器内的液相速度、气液流态、气泡行为进行了分析探讨。流场中的涡流呈周期性变化，周期为7.5 s。根据气泡在反应器内的分散方式，气液流态可分为簇状上流、逐渐分散和完全分散三种流态。流态转变的临界条件方程是由流数( Fl )和弗劳德数( Fr )组合建立的。反应器内气泡直径分布范围随气体流速的增大而增大，随液体流速的增大而减小。流场中的湍流动能、湍流耗散率和速度从撞击中心向径向逐渐减弱。基于无量纲分析，建立了气泡索特直径的数学模型，以准确预测气泡索特直径。该研究为反应器的放大和优化提供了理论依据。