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中文摘要：
借助计算流体力学方法,实现了变速运行混流泵装置内部流动数值模拟和性能预测,将计算的水泵装置性能参数与按相似律换算的结果进行了对比分析。研究结果表明,水泵装置变速运行时,对装置最高效率有一定影响,5种转速下水泵装置最高效率最大相对误差为0.973%。水泵装置在非最优工况下变速运行时,大流量侧装置性能参数按相似律换算误差变小,在小流量侧换算误差增大,最大相对误差达3.043%。水泵装置在不同转速下运行时,除了水泵的机械效率、容积效率和水力效率发生变化之外,受水泵出口流场的影响,出水流道的水力特性不完全相似,相同流量下水力损失不相等,可能是导致按水泵相似律进行水泵装置性能参数换算误差的主要原因之一。
英文摘要：
The numerical simulation of internal flow and performance prediction of a variable speed mixed-flow pumping system are conducted by means of computational fluid dynamics,and the simulated pump performance parameters are compared with those converted by the similitude.The results show that variable speed operation of the pump affects the peak efficiency,and its maximum relative error of the conversion method under five speeds is 0.973%.When the pump runs off the peak efficiency,the error of conversion method decreases in the large flow-rate region,while increases in the small flow-rate region,with a maximum error of 3.043%.Under different pump speeds,the hydraulic characteristics of the outlet passage are not completely similar and the head losses at a given flow rate is not constant as a result of the outlet flow adjustment.These behaviors are the same as that of the mechanical,volumetric and hydraulic efficiencies of the pump.This is a possible explanation for the errors in the converted performance parameters by the similitude.
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