熔盐黏度对熔盐泵内盐析晶粒运动特性的影响

为了揭示熔盐泵输送伴有盐析的两相流动规律，采用Eulerian多相流模型描述固液两相流动特征，分析了输送不同黏度介质时，叶轮和蜗壳流道内盐析晶粒的运动特性。结果表明：泵内存在一些和进口晶粒体积分数（5%）相等的点，由这些点组成的线和面的形状和位置不受输送熔盐黏度的影响；输送熔盐的黏度越大，蜗壳和叶轮流道内晶粒分布越均匀；当输送黏度为0.400 00 Pa·s时，流道内晶粒的体积分数与泵入口处的体积分数基本相同；叶片的压力面和吸力面的进口处和尾部分别具有较大的晶粒体积分数和较高的固相滑移速度。研究结果可为熔盐泵内部伴有盐析的两相流动的研究提供参考。

Effect of Molten Salt Viscosity on Movement Characteristics of Crystal Particles in Molten Salt Pump

In order to reveal the regularity of the crystallization two phase flow in the molten salt pump, Eulerian multi phase model was used to describe the crystallization two phase flow characteristics. Motion characteristics of crystal particles in impeller and volute flow passages were analyzed when pumping various viscosity mediums. The obtained results are as follows: there are some special points inside the pump, where the volume fraction is equal to that at the inlet (5%). Moreover, the shape and location of curves and surfaces made up of those points are independent of molten salt viscosity. The greater the viscosities of molten salt, the more uniform the distribution of the crystal particles in impeller and volute flow passage. When the viscosity is 0.400 00 Pa·s, the volume fraction of the crystal particles in the flow passage is nearly the same as that at the inlet of pump. The volume fraction of the crystal particles is large and the slip velocity is high at the inlet and outlet of the pressure surface and the suction surface, respectively. The results provide references for the study of crystallization two phase flow in the molten salt pump.