【摘要】 喷淋液滴行为特征对事故下安全壳降温降压及放射性气溶胶去除评估具有重要影响。本文采用三维数值模拟方法研究空间内压力旋流喷淋液滴粒径及速度分布，通过与实验数据对比，验证了离散相模型的适用性。分析了液滴在空间内不同位置处的粒径及速度特征，并得出不同喷淋压力对液滴行为的影响。结果表明：球形曳力模型适用压力旋流喷嘴的液滴特性分析；在径向位置上，液滴粒径符合正态分布，距离中心越远，液滴速度越小；在轴向下落方向上，液滴粒径的最大值先增加后减少，液滴速度逐渐减小并趋于稳定，液滴质量浓度逐渐向外围移动；喷淋压力越大，统计粒径越小，稳定的液滴速度值越大。更多还原

【Abstract】 The behavior characteristics play an important role in the cooling and pressure depressurization of the containment and the removal of radioactive aerosols during severe accidents. In this paper, three-dimensional numerical simulation method is used to study the particle size and velocity distribution of spray droplets generated by the pressure swirl nozzle in space, and the applicability of the DPM model is verified by comparing the simulation results with experimental data. The particle size and velocity characteristics of droplet at different positions are analyzed, and the influence of different spray pressures on droplet behavior is obtained. The results show that the spherical drag model is suitable to analyze the droplet characteristics of the pressure swirl nozzle. In the radial position, the droplet size follows normal distribution, and the further away from the center, the smaller the droplet velocity. In the axial falling direction, the maximum droplet size increases first and then decreases, the droplet velocity gradually decreases and become stable, and the droplet mass concentration gradually moves to the periphery. The statistical size decreases and the droplet velocity increases with the increases of the spray pressure.更多还原