离心泵在启动阶段的水力特性研究

针对工作的离心泵,分析了其内部流体的流动情况,建立了在非稳定工况下操作的理论扬程公式,非稳态理论扬程包括旋转加速附加扬程和水流加速消耗扬程以及由于流动速度变化引起泵壳中的附加压力而产生的扬程。在离心泵的启动阶段,对其在不同阀门开度下的水力性能进行了试验研究。测量了瞬时转速、流量、扬程随时间的变化关系,并把试验结果进行修正。由于启动时一部分扬程用来提供流体加速,压力传感器测量不到,因此必须把试验扬程加以修正。将理论计算与修正的试验结果进行了比较分析,两者基本吻合。

TRANSIENT HYDRAULIC PERFORMANCE OF A CENTRIFUGAL PUMP DURING RAPID STARTING PERIOD

An analysis of the fluid in a centrifugal pump has been made under unsteady conditions. A theoretical calculation of the head is established to predict the transient characteristics. During the centrifugal pump starting period, the experimental study has been made on the transient hydraulic performance for the varied opening degree of the valve. The changes of instantaneous rotational speed, head and flow-rate with time are measured. The results of the experiments must be revised. Because a part of the head is offered to accelerating the fluid in the pipeline during starting, which is unable to be measured by the pressure-sensor. The theoretical calculations are analyzed and compared with the corresponding experimental results. The revised head is identical with the steady-estimated one basically.