Abstract
In order to enhance the hydraulic efficiency of a liquid molten salt pump, the improvement on the pump was carried out through numerical and experimental methods. The internal flow field obtained by the numerical simulation was analysed. The results show that there are low-velocity area in the scroll region and large curvature of the streamline at the outlet. Geometric modification was made by trimming the back-blades of the impeller and filleting the sharp corner of the outlet pipe. The modified pump performance was verified by the experiments. The hydraulic efficiency, the pressure fluctuation, vibration characteristics between the original and modified pump were compared. The results showed that the hydraulic efficiency of the modified pump increased 7.4%. In addition, the pressure fluctuation and vibration intensity were also reduced compared with the original pump. This result shows that the geometric modification improves not only the hydraulic performance but also the structural properties.
Highlights
A liquid molten salt pump is a vertical submerged centrifugal pump that is mainly used to transport high-temperature substances, including nitrate, nitrite, and ionic membrane caustic soda.It is widely used in nuclear reactors, salt manufacturing, alkali manufacturing, and other chemical industries
We investigate the performance improvement of a liquid molten salt pump prototype introduced in Section 2.1 by geometric modification
It can befour observed that there arebecause no obvious five andexperimentally troughs in the pressure pulsation curve these monitoring points, the five peaks and troughs in the pressure pulsation curve at these four monitoring points, because the position of monitoring points that at annular discharge chamber is far from the impeller outlet and the position of monitoring points that at annular discharge chamber is far from the impeller outlet and pressure fluctuation caused by rotor-stator interference gradually weakens during delivery
Summary
A liquid molten salt pump is a vertical submerged centrifugal pump that is mainly used to transport high-temperature substances, including nitrate, nitrite, and ionic membrane caustic soda. It is widely used in nuclear reactors, salt manufacturing, alkali manufacturing, and other chemical industries. Shao et al [14] analysed external performance and internal flow of a molten salt pump that transported fluids with different viscosities. They found that the pump’s efficiency decreased as the viscosity increased. The hydraulic performance, pressure characteristics and vibration characteristics were measured and analysed
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