Abstract：In order to study the transient dynamic characteristicsof the nuclear main pump under different conditions,the pressure fluctuationunder four different eccentricitieswere analyzed based on CFX RNG k-ε model of three-dimensional unsteady numerical simulation methods. The results showed that the change of eccentricities did not change the dominant frequency of impeller, however, with the increasing of the eccentricities the pressure amplitude inside the impellerincreased with the decrease first.The pressure hadthe similar change rules for different eccentricities under different working conditions and wave frequency were equal to the number of guide vane which indicated that the flow state within the impeller under the influence of guide vane was very large.Under the small flow conditions, with the increase of eccentricity the fluctuation amplitude peak appeared gradually to the next moment, the pressure fluctuation amplitude werelarger under different eccentricities. At the design point, the fluctuation amplitude in the impeller flow passage was less than the small flow condition and the outlet pressure amplitude was greater than inlet. Under the large flow rates, the monitor points of pressure amplitude within the impeller under different eccentricities from inlet to outletwere unstable, and the fluctuation amplitude was greater than the design conditions.The analysis results showed that the pressure fluctuationof nuclear main pump under various operating conditions was minimalwhen the eccentricity within 10mm~15mm.
王鹏，袁寿其，王秀礼, 周帮伦，卢加兴. 蜗壳不同心度对核主泵瞬态水动力特性研究[J]. 振动与冲击, 2015, 34(22): 13-18.
Wang Peng, Yuan Shouqi, Wang Xiuli，Zhou Banglun, Lu Jiaxing. Study of Nuclear Main Pump Volute on Transient Dynamic Characteristicsunder Different Eccentricities. JOURNAL OF VIBRATION AND SHOCK, 2015, 34(22): 13-18.
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