Effects of the staggered blades on unsteady pressure pulsations of a centrifugal pump with a specific speed n_s=147 are investigated by the numerical simulation method. The obtained results are compared with the original blades. To clarify the resulting effects, eight monitoring points are used to extract pressure signals at three typical working conditions, and component at the blade passing frequency f_BPF is emphasized. Results show that the pump efficiency and head will be reduced by the staggered blades, and at the nominal flow rate, the reduction is about 1.5% from comparison with the original blades. For all the eight points, the staggered blades contribute to the reduction of pressure amplitudes at f_BPF when the pump works at three flow rates. The averaged reduction is 15.5% at the nominal flow rate. However, the negative effect on the second harmonic of f_BPF will be caused by the staggered blades, and the corresponding pressure amplitude will increase at 2f_BPF. It means that the pressure pulsation energy will be redistributed among the discrete components in pressure spectrum by the staggered blades. From the TKE distribution, it is found that the TKE values on the blade pressure side will be significantly affected by the staggered blades.

通过数值模拟方法研究了叶片错位对转速为_{s s} = 147的离心泵非定常压力脉动的影响。将获得的结果与原始刀片进行比较。为了阐明所产生的影响，在三个典型的工作条件下使用八个监测点提取压力信号，并强调了叶片通过频率f _BPF时的分量。结果表明，交错的叶片会降低泵的效率和扬程，在额定流量下，与原始叶片相比，降低了约1.5％。对于所有八个点，交错的叶片有助于减小f _BPF时的压力幅度当泵以三种流速工作时。在额定流量下，平均减少量为15.5％。但是，f _BPF的二次谐波的负面影响将由交错的叶片引起，并且相应的压力幅度将在2f _BPF处增加。这意味着通过交错的叶片，压力脉动能量将在压力谱中的离散分量之间重新分配。从TKE分布中发现，叶片压力侧的TKE值将受到交错叶片的影响。