摘要
为研究螺旋混流式喷水推进泵动静干涉的压力脉动特性,运用ANSYS Fluent软件基于RNGκ-ε湍流模型,采用SIMPLEC算法进行变流量工况下非定常数值模拟,分析变流量工况下泵内各监测点的时域和频域特性。结果表明,螺旋混流式喷水推进泵内压力脉动的振源主要位于叶轮与导叶交界处,压力系数的幅值最大,且压力脉动自交界面处分别向上、下游传播并逐渐减弱。在叶轮旋转区域,压力系数的幅值受径向位置的影响较强,在导叶静止区域,压力系数的幅值受径向位置的影响较弱。各监测点压力脉动的主频不受流量变化的影响,均为叶片通过频率。在叶轮进出口,压力系数受流量变化影响最为明显;叶轮出口处的压力脉动频谱较宽。在远离叶轮旋转区域,压力系数受流量变化的影响较小,监测点的主频集中在叶频处,压力脉动幅值较小,无高频脉动出现。研究成果可为喷水推进泵的噪声及振动控制提供参考。
In order to study the pressure fluctuation induced by the dynamic and static interference of the water-jet propulsion mixed-flow pump,the software ANSYS Fluent,the RNG turbulent κ-εmodel and SIMPLEC algorithm were applied to simulate the unsteady flow in variable-flow conditions.The time domain and frequency domain characteristics of the pump at different monitor positions under various flow rate conditions were analyzed.The results show that the vibration source of pressure fluctuation in the water-jet propulsion mixed-flow pump was mainly located at the interface of impeller and guide vane where the amplitude value of pressure coefficient reaches the maximum,the pressure fluctuation propagates the upstream and downstream from the interface position and it gradually attenuates.In the rotation zone of the impeller,the amplitude value of pressure coefficient is strongly affected by the radial position.In the static zone of the guide vane,the amplitude value of pressure coefficient is weakly affected by the radial position.The dominant frequency is not changed under different flow rate conditions and is approximate to the blade passing frequency.In the zone of the impeller inlet,the pressure fluctuation is influenced obviously by different flow rate conditions.The frequency spectrum of the pressure fluctuation in the impeller outlet is wider.In the zone away from the impeller rotation,the pressure fluctuation is influenced poorly by different flow rate conditions and the dominant frequency is approximate to the blade passing frequency.The amplitude value of pressure coefficient is smaller and the high frequency pressure fluctuation is not appeared.The study results can provide reference for the noise and vibration control of the water-jet propulsion pump.
作者
韩伟
韩阳
龚鹏飞
王洁
胥丹丹
HAN Wei;HAN Yang;GONG Peng-fei;WANG Jie;XU Dan-dan(College of Energy and Power Engineering,Lanzhou University of Technology,Lanzhou 730050,China;Key Laboratory of Fluid Machinery and System,Gansu Province,Lanzhou 730050,China;Shanghai Electric-KSB Nuclear Power Pumps & Valves Company,Shanghai 201308,China)
出处
《水电能源科学》
北大核心
2019年第3期136-139,149,共5页
Water Resources and Power
基金
国家自然科学基金项目(51669012
51209113)
关键词
螺旋混流式喷水推进泵
压力脉动
变流量工况
数值模拟
water-jet propulsion mixed-flow pump
pressure fluctuation
various flow rate conditions
numerical calculation
