熔盐泵内颗粒属性对固液两相流动的影响

熔盐泵工作环境的特殊性会导致泵内含有熔盐小颗粒，这些小颗粒使泵性能下降，并降低过流部件寿命。为探究熔盐泵输送两相介质时的性能，基于Eulerian多相流模型和标准K-8湍流模型，采用FLUENT软件对不同的颗粒属性（粒径、体积分数、密度）产生的影响做了研究。结果表明：颗粒对泵流动产生了较为明显的影响，粒径越大的颗粒在工作面处的体积分数越高，固相离析作用也越来越明显。泵内部存在一些体积分数与进口颗粒体积分数相等的点，这些点形成的曲面的形状和位置不随颗粒的属性改变而改变。这些曲线的形状和位置可用来判断泵内流动的状态和泵结构设计的合理性。该研究发现的一种全新的两相流现象，可用于初步判断固液两相流泵的水力性能。

Inference of Particle Properties to Solid-Liquid Two-Phase Flow in Molten Salt Pump

Special work condition of molten salt pump leads to the generation of small particles, which changes theperformance of molten salt pump. In order to reveal the law of two-phase flow performance of molten salt pump, theeffect of different particle properties to the pump was studied by using FLUENT software with Eulerian model andstandard K-E turbulence model. Simulation results show that particle properties ( diameter, volume fraction, density)have obvious effect to the internal flow of pump, although the density between solid phase and liquid phase. A newinteresting phenomenon is found that some special points distribute in the pump. The particle volume fraction in thosepoints is equal to the inlet. Moreover, the position of those points is independent of particle properties. Connect all thosepoints in middle section of the pump, at least one inerratic curve will formed. The shape and position of the curve can beused to estimate the quality of the designed pump structure. The new two-phase flow phenomenon can be used forpreliminary judgment of solid-liquid two-phase flow pump hydraulic performance.