分流叶片对离心泵内部固液两相流的影响

Effect of splitting blades on solid-liquid two-phase flow in centrifugal pump

为了研究分流叶片对离心泵内部固液两相流的影响,建立固液两相流模型,对无分流叶片离心泵和3种带分流叶片的离心泵进行全流道非定常数值模拟。重点分析了添加分流叶片对离心泵外特性、叶片表面压力脉动、叶片表面颗粒体积分数分布、叶片表面颗粒滑移速度的影响。分析结果表明:添加分流叶片以后,离心泵的扬程和效率均有显著的提高,叶片表面的颗粒分布更加均匀,叶片表面颗粒的滑移速度有不同程度的下降,使颗粒对叶片表面的磨损程度得以降低;当分流叶片的进口直径为0.65D2时,叶片出水边处的压力脉动幅值最小,减小了离心泵在运行过程中的振动和噪声。

In order to study the influence of splitting blade on the solid - liquid two - phase flow in centrifugal pump, numerical simulations of unsteady flow are carried out for the full channel of centrifugal pump without splitting blade and with three types of splitting blades based on the model of solid - liquid two - phase flow. The effect of splitting blade on external performance of the pump, pressure pulsation on the blade surface, distribution of particle volume fractions on the blade surface and slip velocity of particles on the blade surface are analyzed. After arranging the splitting blades, the lifting head and efficiency of the pump are significantly improved, particle distribution on the blade surface is more uniform, and the slip velocity of particles on the blade surface decreases in different degrees. The erosion degree of the blade surface is reduced. When the inlet diameter of splitting blade is 0.65 D2 , the pressure pulsation amplitude is minimum at the outlet of the blade, reducing the vibration and noise of centrifugal pump in operation.