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为研究核主泵启动过程中压力脉动和径向力的变化规律,根据AP1000启动过程的物性变化规律及参数设置,采用统计学方法对泵内无量纲压力脉动强度进行描述,采用频谱法分析了叶轮径向力。结果表明:导叶流道的压力脉动强度明显强于叶轮流道,随工作温度升高,强度递减;叶轮和压水室的压力脉动强度较弱,随工作温度升高,呈现不规律变化;叶轮径向力在叶频的1倍频和2倍频的脉动幅值较小,随工作温度升高,呈现不规律变化;而叶轮径向力在5倍频的脉动幅值最大,且随工作温度升高,其值递减;核主泵偏离设计工作点运行于常温下会导致导叶流道压力脉动增强,导致主泵的径向振动增强。
In order to study the variation of pressure pulsation and radial force during the start-up of the nuclear main pump, the dimensionless pressure pulsation intensity in the pump was described by the statistical method according to the physical property variation and parameter setting during AP1000 start-up. Impeller radial force. The results show that the pressure pulsation of the guide vane is obviously stronger than that of the impeller. With the increase of the working temperature, the strength decreases. The pressure pulsation strength of the impeller and the pressure water chamber is weak, and varies irregularly with the increase of working temperature. Impeller radial force in the leaf frequency 1 and 2 times the frequency of the pulsation amplitude smaller, with the working temperature increases, showing irregular changes in the impeller radial force at 5 times the frequency of the maximum pulse amplitude, and with The working temperature increases and its value decreases. When the nuclear main pump deviates from the design working point and runs at normal temperature, the pressure pulsation of the guide vane flow channel will increase, leading to the increase of the radial vibration of the main pump.