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| Numerical analysis on effects of nuclear main pump radial force under different eccentricities |
| Wang Peng, Yuan Shouqi, Wang Xiuli, Yin TingYun |
| National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China |
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Abstract In order to study the radial force of nuclear main pump, the prototype pump and the offset of the center of gravity of the nuclear main pumps had been investigated numerically by CFD calculation based on the RNG k-ε model. Results of performance of the nuclear main pumps, distribution of static pressure at the center section and the radial force features acting in the volute and impeller features had been obtained from the simulation, and were compared with the theoretical analysis. The results showed that the test results and numerical calculation were in good agreement in this paper thus the results of numerical calculation of radial force calculation model for nuclear main pump has certain accuracy. There is no great difference in distribution of static pressure within four schemes in the impeller and guide vane, but in the volute varies obviously, the static pressure distribution of different eccentricity were asymmetric, and the change of eccentricity had a certain influence on the internal and external performances of nuclear main pump. The radial force of nuclear main pump was minimum when it operated at the design point, but not equal to zero,the radial force was optimum when the eccentricity were 10 millimeter. By comparing the predicted radial force and the Stepanoff theoretical ones under different eccentricities it could be known that, the curves trend of the radial force under different eccentricities were consistent with the theoretical ones and the method of the numerical simulation verified the accuracy of the radial force calculated by the empirical formula.
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Received: 01 July 2014
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