The molten-salt pump is used to transport high-temperature membrane caustic soda, carbonate, nitrate, phthalic anhydride and other mediums in industrial loops. The temperature of the medium in the molten-salt pump is generally above 400℃. In order to study the operation stability of the pump transporting high-temperature molten salt, the stress and the deformation of the pump rotor were simulated using ANSYS commercial code. At different medium flow rates, the effect of unsteady flow on the rotor was considered. The modal performance of the rotor was investigated as well. The results indicated that static pressure increases gradually with the increase of the flow rate. The temperature in the rotor decreased gradually from the impeller to the bearings along the shaft, and the influence of temperature deserves a full consideration during the pump design in view of high temperature gradients arising at both ends of the rotor. The maximum equivalent stress in the impeller at different flow rates occurred at the junction of the blade leading edge and the front shroud. A distinct stress concentration was found at the position of the bearings. The maximum deformation in the rotor emerged at impeller outer edge. The maximum equivalent stress and deformation degraded with the increase of the flow rate. Under the design condition, both the maximum equivalent stress and rotor deformation fluctuated slightly. The first six order natural frequencies rise slightly with the introduction of pre-stress, but the change of vibration amplitude was insignificant. Furthermore, the effect of flow rate on the modal performance was negligible. The modal deformation of the pump rotor was concentrated on the impeller, which was determined by the supporting manner and operation characteristics of the pump rotor. Natural frequencies corresponding to each mode of the pump rotor deviate considerably from the blade passing frequency and its second harmonic frequency as well. Therefore, the resonance caused by hydraulic excitations will not occur for the molten-salt pump considered.
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