混流泵停机过程的瞬态水力特性分析研究

针对混流泵在不同转速下停机过程中的瞬态水力特性进行了试验研究，并对试验结果进行了讨论。介绍了用于瞬态水力性能测试的试验设备以及试验方法，不同转速下停机过程的瞬态水力特性，并尝试用三次多项式拟合的方法模拟停机过程的流量-扬程曲线。试验结果显示了在停机瞬间泵的流量和扬程迅速下降，管路能量亦急剧降低，但在这一过程中无噪音和气泡产生，由此提出了瞬态工作泵的停机阶段操作方法。同时，试验结果亦显示了三次多项式拟合曲线与实际测量曲线能基本符合。试验和计算结果可在瞬态工作特性方面为瞬态离心式水泵的设计和实际使用打下基础。

Analysis on Transient Performance of Mixed Flow Pump During Stopping Period

To investigate the transient hydrodynamic performance of mixed flow pump at different rotational speeds during the stopping period,some theoretical and experimental studies are carried out,and the analysis of the test results are presented.The experiment equipments and test methods for testing the transient hydrodynamic performance are introduced.The transient hydrodynamic performances at different rotational speeds are tested.The thrice polynomial curve equation is used to simulate the real tested-curve.The test results indicated that the flow-rate and the pump head decreased rapidly at the very beginning of the stopping,and also the pipe energy,but there were no noises and air bubble produced during this period,than some operation notices are presented.The test results also indicated that the prediction results can fit the real tested-curve on the whole.The test and numerical results built the foundation for academic design and practical use on the pump transient hydrodynamic performance aspect.