基于数字信号处理的轴流泵压力脉动试验研究

发布时间：2018-05-13 11:57

本文选题：轴流泵 + 压力脉动　；参考：《振动与冲击》2017年20期

【摘要】：传统电信号压力传感器受电流干扰严重,为准确地获得轴流泵内部压力脉动特性,采用高精度数字压力采集系统对一轴流泵模型的叶轮进口、导叶流道内和导叶出口进行压力测试,试验在包含马鞍区的4个流量工况(0.45Q_d、0.8Q_d、1.0Q_d、1.2Q_d)下进行。试验结果表明:在稳定工况(0.8Q_d、1.0Q_d、1.2Q_d)下叶轮进口监测点P1的时域信号为规则的正弦波,脉动周期与叶片通过周期一致;受叶轮与导叶的动静干涉影响,导叶内部P2及出口P3均出现了小峰值的二次谐波。在非稳定工况(0.45Q_d)下各点的时域信号均出现较大峰值的二次谐波。通过快速傅里叶变换(FFT)获得了各监测点的频域结果:稳定工况下各监测点的压力脉动主频均为叶频(BPF),从叶轮进口至导叶出口幅值逐渐减小;非稳定工况下由于回流和叶顶泄漏涡等因素的影响,各监测点的频率成分复杂,主频向高频段移动且伴随有较强高频信号,脉动幅值大于其余工况。
[Abstract]:The traditional electric signal pressure sensor is seriously disturbed by the current. In order to accurately obtain the internal pressure pulsation characteristics of the axial flow pump, a high precision digital pressure acquisition system is adopted to the impeller inlet of an axial flow pump model. The pressure test was carried out in the guide vane channel and at the outlet of the guide vane. The test was carried out under four flow conditions including saddle area: 0.45QdL / 0.45QdL / 1.0QdD / 1.2Q / d / _ _ _ The test results show that the time domain signal of the impeller inlet monitoring point P1 is regular sine wave under steady working condition (0.8Q / d / 1.0QD / d), and the pulsation period is consistent with the blade passing cycle, which is affected by the dynamic and static interference between the impeller and the guide vane. There are small second harmonic waves in the internal P2 and outlet P3 of the guide vane. In the unstable condition of 0.45QD), the time domain signal of each point has a larger peak second harmonic. The frequency domain results of each monitoring point are obtained by using fast Fourier transform (FFT). The main frequency of pressure pulsation at each monitoring point under steady working condition is BPFN, and the amplitude from the impeller inlet to the outlet of the guide vane decreases gradually. Due to the influence of reflux and tip leakage vortex, the frequency components of the monitoring points are complex, the main frequency moves to the high frequency band and accompanied by strong high frequency signals, and the pulsation amplitude is larger than the other conditions.
【作者单位】：江苏大学国家水泵及系统工程技术研究中心;江苏大学能源与动力工程学院;
【基金】：国家科技支撑计划项目(2015BAD20B01 江苏省水利科技项目(2015042) 江苏高校自然科学研究项目(09KJB570001)
【分类号】：TH312

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