| In this paper which refer to the parameters of AP1000, a variety of hydraulic designed methods are fully compared, then the hydraulic model which rotation speed is 1450r/min is designed by way of velocity modulus in order to meet domestic power grid frequency of 50Hz..Then the inner high temperature and high pressure flow field are simulated by using the CFD software of FLUENT, the results show the characteristic of the inner flow field of the nuclear main pump in different flow rate and refluence phenomena in the outlet of pumping chamber. The secondary flow phenomena is also discovered in the impeller and diffuser junctionIn order to clarify the influence of temperature and pressure conditions on the nuclear main pump hydraulic performance, the curve of Flow-Efficiency and Flow-Head are drawn in the condition of high temperature and high pressure and in the condition normal temperature and normal pressure separately. The simulation results show that the modulus charts which working medium is clean water is still applicable for the nuclear main pump and the hydraulic model of nuclear main pump which is designed by using the traditional velocity modulus is feasible. Compared the conditions of normal temperature and normal pressure, the conditions of high temperature and high pressure only change the physical parameters of the working medium, the pump head has little change, the pump efficiency increased slightly.The radial diffuser based on the special structure of AP1000 is designed by the way of centrifugal pump radial diffuser, the twist diffuser based on the special structure of AP1000 is designed by the way of vaned diffuser and conformal transformation. Then the two diffuser models are simulated, the results show that twist diffuser model is better than radial diffuser model on pump head and efficiency.In this paper,the design method of nuclear main pump is explored and some achievements are gained which will provide some useful references for hydraulic optimized design.
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