控制棒水压驱动机构水压缸步升压力变化过程

Pressure transients in hydraulic cylinder step-up motion of control rod hydraulic drive mechanism

水压缸是核反应堆控制棒水压驱动机构的重要部分。建立了入缸流体能量方程和水压缸密封流动阻力方程,得到了理论模型。用该模型进行了水压缸步升压力变化过程理论分析。理论动态压力曲线很好地符合了实验曲线。结果表明:随着驱动压力的降低,水压缸步升前充压过程、步升增压过程和步升至顶端后压力变化过程所需时间逐渐增加,且步升增压过程终点压力逐渐减少。该研究结果为获得控制棒水压驱动系统的步进时间提供了理论基础。

The energy equations for the fluid flowing into the hydraulic cylinder and flow resistance equations in hydraulic cylinder were solved to calculate the pressure variations during the hydraulic cylinder step-up motion in the control rod hydraulic drive mechanism （CRHDM） for nuclear reactors. Theoretical pressure curves agreed well with experimental data. The results show that the pressure transient times before, during, and after the step-up motion all increase with decreasing driving pressure with the pressure at the end of the step-up motion decreasing with the driving pressure. This will be used to optimize the step motion time for the CRHDM.