Based on the bidirectional fluid structure interaction method, the flow field and the structural response of the impeller were solved. The mechanical properties of the impeller of the nuclear reactor coolant pump were studied.The stress and deformation distribution of the impeller, the leading and trailing of the blade and the root of the blade under different flows were analyzed. The results show that the fluid structure interaction effect has some influence on the characteristics of the nuclear reactor coolant pump and the result is closer to the test value after coupling; with the increase of flow rate, the stress distribution uniformity of the front shroud decreases, and the maximum equivalent stress occurs at the trailing edge of impeller blade and the frond shroud at the junction, where the fatigue load is liable to occur under the alternating load; the maximum deformation of the impeller occurs at the middle of the exit edge of the blade, which increases with flow rate; the stress concentration phenomenon appears easily at the leading and trailing of the blade root, which shows that the inlet and outlet of the blade are very sensitive to the pressure, load and static and dynamic interference of the fluid flow; as a result enough attention should be paid to these areas in impeller′s hydraulic and structural design. The results provide a useful reference for the performance analysis of the nuclear reactor coolant pump as well as the structural design, maintenance and overhaul of the impeller.
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