【摘要】 为了分析不同导叶相对距离对S形轴伸式贯流泵装置压力脉动特性的影响,采用ANSYS CFX软件对4种不同导叶相对距离的泵装置进行了三维定常与非定常计算,并通过模型试验验证数值模拟计算的可靠性。结果表明:泵装置扬程与效率随导叶相对距离的增大先增加后减小,导叶相对距离对扬程的影响趋势更明显;导叶相对距离对监测点主频频率没有影响而对幅值影响较大;当导叶相对距离增大时,在导叶进口处,主频幅值逐渐减小,断面高压力脉动强度面积逐渐减小,近轮缘侧压力脉动强度变化比近轮毂侧更明显;在导叶出口处,各频幅值先减小后增大,断面高压力脉动强度面积先减小后增大;导叶相对距离为16 mm时,泵装置综合性能最优。更多还原

【Abstract】 To study the influence of different relative distances of guide vanes on the pressure pulsation characteristics of a S-shaped extension tubular pumping system,three-dimensional steady calculation and unsteady calculation were applied under 4 different relative positions of guide vanes by using ANSYS CFX software and the reliability of the numerical simulation was verified by a model test. The results show that the pump head and efficiency increase first and then decrease with the increasing of the guide vanes’ relative distance,and the pump head can be affected much more obviously. The relative distance of the guide vanes has no influence on the dominant frequency of the monitoring points,but it has greater impact on the amplitude. With an increase of the relative distance at the guide vanes’ inlet position,the amplitudes of dominant frequency and cross section area of high pressure pulsation strength can decrease. The pressure pulsation strength variation near the flange side is more obvious than that near the hub side. The amplitude of the dominant frequency decreases first and then increases at the guide vanes’ outlet and the cross-section area of high pressure fluctuation strength decreases first and then increases. The performance of the pump is optimum when the relative position of the guide vanes is set to be 16 mm.更多还原