核主泵小流量工况压力脉动特性

朱荣生;龙云;付强;袁寿其;王秀礼

振动与冲击 ›› 2014, Vol. 33 ›› Issue (17) : 143-149.

PDF(3743 KB)
PDF(3743 KB)
振动与冲击 ›› 2014, Vol. 33 ›› Issue (17) : 143-149.
论文

核主泵小流量工况压力脉动特性

  • 朱荣生,龙云,付强,袁寿其,王秀礼
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Pressure Pulsation of Reactor Coolant Pump in Low Flow Conditions

  • Zhu Rongsheng, Long Yun, Fu Qiang, Yuan Shouqi, Wang Xiuli
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摘要

为研究小流量工况下核主泵内部压力脉动的变化规律,基于雷诺时均N-S方程和标准 k-ε两方程及SIMPLEC算法,应用CFX软件对核主泵小流量工况进行定常和非定常数值计算,得到泵内部流场和各工况监测点的压力脉动,并将时域信号进行快速傅里叶变换为频域信号。结果表明:核主泵内压力脉动明显,叶频在由压力脉动诱发的振动中起主导作用,主要表现为叶轮和导叶间的动静干涉。叶轮导叶流道内的回流造成了小流量工况叶轮和导叶流道及其周向的不稳定压力脉动,回流主要存在于叶轮和导叶进出口位置,因此该区域的压力波动剧烈且周期性差。核主泵的振动,不利于核电站的安全稳定运行,通过对小流量工况的压力脉动分析,对预测核主泵在极端工况下的动态特性和推进核主泵国产化具有十分重要的意义。

Abstract

For the study on pressure pulsation of reactor coolant pump in low flow conditions, based on the Reynolds-averaged Navier-Stokes equations with the standard k-ε turbulence model and SIMPLEC algorithm, using the computational fluid dynamics software CFX to conducts the numerical simulation calculation, the flow field and pressure pulsation are obtained. Fast Fourier Transform(FFT) is used to change time-domain pressure signals into frequency-domain pressure signals. The results show that: pressure pulsation in reactor coolant pump is obvious, induced by which the blade passing frequency plays a dominant role in the vibration, mainly manifested as dynamic-static interference between the impeller and guide vane. The reflow in the impeller diffuser flow channel leads to the unsteady pressure pulsation of the impeller diffuser flow channel and its circumferential direction in low flow conditions. The reflow of reactor coolant pump internal flow channel in low flow conditions exists in the import and export of impeller and guide vane outlet, so the pressure pulsation in the region is violent and weakly regular. Pressure pulsation causes pump vibration, which is not conducive to the safe and stable operation of the nuclear power plant. By analysis on the pressure pulsation in low flow conditions, forecasting dynamic characteristics of reactor coolant pump in the extreme conditions, it has great significance to promote reactor coolant pump localization.

关键词

核主泵 / 压力脉动 / 小流量 / 数值模拟 / 时域与频域分析

Key words

reactor coolant pump / pressure pulsation / low flow conditions / numerical simulation / time-frequency domain analysis

引用本文

导出引用
朱荣生;龙云;付强;袁寿其;王秀礼. 核主泵小流量工况压力脉动特性[J]. 振动与冲击, 2014, 33(17): 143-149
Zhu Rongsheng;Long Yun;Fu Qiang;Yuan Shouqi;Wang Xiuli. Pressure Pulsation of Reactor Coolant Pump in Low Flow Conditions[J]. Journal of Vibration and Shock, 2014, 33(17): 143-149

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