大流量工况下核主泵内部不稳定特性分析

王鹏,袁寿其,王秀礼,周帮伦, 李贵东

振动与冲击 ›› 2015, Vol. 34 ›› Issue (9) : 196-201.

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振动与冲击 ›› 2015, Vol. 34 ›› Issue (9) : 196-201.
论文

大流量工况下核主泵内部不稳定特性分析

  • 王鹏,袁寿其,王秀礼,周帮伦,  李贵东
作者信息 +

Analysis of Unsteady Characteristics forNuclear Main Pump under Large Flow Conditions

  • Wang Peng,Yuan Shouqi,Wang Xiuli,Zhou Banglun,Li Guidong
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文章历史 +

摘要

为了研究大流量工况下,核主泵内部流动不稳定特性,基于RNG k-ε湍流模型,利用ANSYS CFX对大流量工况下核主泵内部流场进行三维非定常数值模拟,分析了大流量工况下在导叶不同位置9个监测点上压力脉动的时域和频域特性。研究结果表明:由于漩涡的存在,H~Q曲线在1.0Qd~1.1Qd内出现正斜率现象。核主泵导叶流道内最大压力脉动出现在导叶进口处,随着流量的变化,主泵运行偏离最优工况越远,导叶进口处的压力脉动系数越大,在1.3Qd工况时导叶进口处的压力脉动系数最大且为出口处的2.5倍;蜗壳壁面的径向力受流量变化影响最大,在一个旋转周期内蜗壳壁面所受到的径向力随流量的增加平均值逐渐增大,偏离额定工况越大,蜗壳壁面受到的径向力最大,导叶次之,叶轮最小。试验与数值对比分析发现大流量工况下二者吻合较好,证明该数值模型可较准确地描述泵内流场特征。

Abstract

In order to study the internal unsteady flow of nuclear main pump under large flow rates, based on the RNG k-ε turbulence model, using ANSYS CFX to investigate the internal unsteady situation and numerical simulation the three dimensional unsteady flow field of nuclear main pump, analysis the deviation flow conditions in time domain and frequency domain of pressure fluctuation in the different locations of the guide vane with nine monitoring points. Results show that due to the existence of vortex, H~Q curve within 1.0~1.1Qd to appear the phenomenon of positive slope.The strong pressure pulsation appeared in the inlets of guide vane, the further of the pump running deviation from the BEP condition, the larger pressure pulsation coefficient, the pressure pulsation coefficient in the inlet of guide vane is 2.5 times in that of outlet during the 1.3Qd condition; the main pulsation frequency is the frequency of impeller blade passing frequency, the radial force in the wall of volute mainly affected by the changing flow rates. In a rotating cycle the average radial force in the wall of volute increased with the increasing of flow rates, the further deviation from the BEP condition, the greater radial force acted on the volute wall, followed by the guide vane, impeller is minimal. Comparing the calculation results with the test results found thatit agrees well under large flow rates, which proved that the numerical model can accurately describe the characteristics of flow fields inside the main pump.

关键词

核主泵 / 不稳定特性 / 压力脉动 / 径向力

Key words

Nuclear main pump;Unsteadycharacteristics / Pressure fluctuation / Radial force

引用本文

导出引用
王鹏,袁寿其,王秀礼,周帮伦, 李贵东. 大流量工况下核主泵内部不稳定特性分析[J]. 振动与冲击, 2015, 34(9): 196-201
Wang Peng,Yuan Shouqi,Wang Xiuli,Zhou Banglun,Li Guidong. Analysis of Unsteady Characteristics forNuclear Main Pump under Large Flow Conditions[J]. Journal of Vibration and Shock, 2015, 34(9): 196-201

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