Along with the crucial requirement for efficiency improvement in the cutting-edge petrochemical technology, the evaluation of the dynamic performance characteristics of high-speed pump is becoming increasingly important. It has become a main topic in the research of high-speed pump to minimize the pressure pulsation induced by the fluid in the pump body, so as to reduce the mechanical vibration. Although the research on the transient flow characteristic and pressure fluctuation of a high-speed pump with straight blades is of great significance, it has been seldom explored. In this work, the flow instability of a 16 straight-blade high-speed centrifugal pump is studied numerically at a rotational speed of 8500 rpm and flow rate of 3 m³/h. Results show that with the influence of rotor-stator interaction, time-domain pressure signals at the tongue show double peak characteristic, whereas a single peak characteristic exists at the diffuser wall. The pressure fluctuation near the tongue is reduced to approximately half of that at the volute wall by the water ring effect accompanied with the high-pressure factor. At the tongue region, the amplitude of the blade passing frequency is reduced by the unsteady flow, whereas the harmonic wave was increased at 2–4 times of the blade passing frequency.

中文翻译：

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流量对直叶片高速泵性能和压力脉动的影响

随着尖端石油化工技术对效率提高的关键要求，对高速泵的动态性能特性的评估变得越来越重要。使泵体内流体引起的压力脉动最小化，从而减少机械振动已成为高速泵研究的一个主要课题。虽然对直叶高速泵的瞬态流动特性和压力脉动的研究具有重要意义，但鲜有探索。本工作对16轴直叶高速离心泵在转速8500rpm、流量3m ^{3 时}的流动不稳定性进行了数值研究。/H。结果表明，在转子-定子相互作用的影响下，舌部的时域压力信号呈现双峰特征，而扩散器壁处存在单峰特征。在高压因素的作用下，水环效应使舌部附近的压力波动减小到蜗壳壁处的压力波动的一半左右。在舌区，叶片通过频率的幅值被非定常流动降低，而谐波在叶片通过频率的 2-4 倍时增加。