To study the effect of impeller back-blade type on the external characteristics, internal flow and axial force of molten-salt pump, a vertical high temperature molten-salt pump was chosen as the research model. Impellers with forward-bent back-blade, back-bent back-blade, leaned back-blade and straight back-blade in different numbers were established by using Cero software. Based on the k-ε turbulence model, the internal flow was simulated numerically. It is shown that the back-blade shape has less influence on external characteristics of molten-salt pump at design flow rate. Low pressure area appears at the rim of forward-bent back-blade clearly. The forward-bent back-blade and back-bent back-blade have little impact on the hydraulic loss in the pump. The back-blade has an important role in the pump axial force, and the effect is best when the blade number is six and 48% axial force can be balanced at most. If considering high efficiency, the back-bent back-blade can be used. If conside-ring the axial force balance, straight back-blade can be used.
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