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首页> 外文期刊>ISRN Mechanical Engineering >Numerical Study on Pressure Fluctuations Reduction in Centrifugal Pumps: Influence of Radial Gap and Splitter Blades
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Numerical Study on Pressure Fluctuations Reduction in Centrifugal Pumps: Influence of Radial Gap and Splitter Blades

机译：离心泵压力波动减小的数值研究：径向间隙和分流叶片的影响

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摘要

Numerical study was carried out in four centrifugal pumps to analyze the effects of adding splitters and incrementing the radial gap in order to decrease the pressure fluctuations at the blade passage frequency. It is well known that in this kind of pump, the interactions between the flow leaving the impeller and entering the volute generate fluctuating pressures which propagate toward the inlet and the discharge of the pump. These pulsations are mainly associated to the blade passage frequency presenting high amplitudes near the volute tongue and at impeller discharge. Four configurations were analyzed using numerical simulations; the first is the reference pump which will be optimized and the others are the optimized ones. The numerical modelling was performed at the same flow rate having to vary in some cases the rotational speed to reach the operating point. During the calculations, the pressure signals were recorded by virtual sensors placed at several locations of the pump then they were analyzed and processed by means of the Fast Fourier Transform. The pressure fluctuations were plotted and compared between the four configurations, showing clearly the fact of varying the blades number and the radial gap influence significantly on their reduction.
机译：在四个离心泵中进行了数值研究，以分析添加分流器和增加径向间隙的效果，以减少叶片通过频率下的压力波动。众所周知，在这种泵中，离开叶轮并进入蜗壳的流体之间的相互作用产生波动的压力，该压力向泵的入口和出口传播。这些脉动主要与叶片通过频率相关，该叶片通过频率在蜗壳舌附近和叶轮排出时呈现高振幅。使用数值模拟分析了四种配置;第一个是将要优化的参考泵，其他是已优化的泵。数值模拟是在相同的流量下进行的，在某些情况下，必须改变转速才能达到工作点。在计算过程中，压力信号由放置在泵多个位置的虚拟传感器记录，然后通过快速傅立叶变换进行分析和处理。绘制了压力波动并在这四种配置之间进行了比较，清楚地表明了改变叶片数量的事实，并且径向间隙对降低叶片的影响显着。

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