为研究熔盐泵在不同温度下叶轮和导叶结构特性变化，采用流固热耦合方法对不同温度下熔盐泵结构进行分析。分析结果显示：叶轮叶片进口和导叶叶片出口存在应力集中现象，叶轮前后口环根部配合位置和叶轮口环上的应力圆周分布均出现周期分布。叶轮叶片和导叶叶片与盖板交线的变形规律性比较明显，叶轮叶片与盖板交线的变形量自进口至出口先小幅度降低后增加；导叶叶片和盖板交线的变形量由进口到出口呈减小的趋势。温度增加会使前后口环及其配合位置的径向变形量增加，但叶轮口环的变形量均小于静止部件配合位置的变形量，不同温度下叶轮口环和配合位置都满足间隙配合条件，不会出现干涉和卡死现象。

In order to investigate the structural characteristics of the impeller and guide vane of the molten salt pump at different temperatures, a fluidsolid thermal coupling method was adopted to analyze the molten salt pump structure at different temperatures. The analysis results show that the impeller blade inlet and guide vane outlet have stress concentration phenomena. Periodic distribution of stress circumferential distribution occurs at the root mating positions of the impeller front and rear opening rings and the impeller opening ring.The deformation regularity of the intersection line of the impeller blade and guide vane with shroud is relatively obvious, the deformation amount of the intersection line of the impeller blade and shroud from the inlet to the outlet firstly slightly decreases and then increases. While the deformation amount of the intersection line of the guide vane and shroud tends to decrease from the inlet to the outlet. The increase of temperature will increase the radial deformation amount of the front and rear opening rings and its mating position, but the deformation amount of the impeller opening ring is smaller than that of the mating position of the stationary parts, and the impeller opening ring and the mating position at different temperatures will meet the clearance fit conditions and no interference and jamming phenomena will occur.

TH311

国家自然科学基金(51479083，52009115)；流体及动力机械教育部重点实验室（西华大学）开放课题资助(LTDL2021-003)；西华大学人才引进项目(Z212007)