后置灯泡贯流泵装置“马鞍”区数值模拟

发布时间：2018-04-15 09:31

本文选题：数值模拟 + 模型试验　；参考：《人民长江》2017年10期

【摘要】："马鞍"区是指轴流泵装置在扬程-流量曲线上小流量工况时的扬程随着流量的减小而出现先减后增的一段区域,在该区域内,泵装置运行状况极不稳定。以南水北调东线淮安三站的后置灯泡贯流泵装置为研究对象,采用ANSYS-CFX数值模拟与模型试验相结合的研究方法,计算并分析了"马鞍"区的流动特性,并将其与设计工况时流动特性进行了对比。结果表明:泵装置运行在"马鞍"区时,进水流道出水断面轴向速度的分布均匀度与速度加权平均角,前、后导叶体段的水头损失,过流部件内部流速场与压力场的分布等指标,均达不到设计要求;在"马鞍"区工况内,大流量时的水力性能要优于小流量时的水力性能。
[Abstract]:"saddle" area refers to the region in which the head of the axial flow pump device decreases first and then increases with the decrease of the flow rate under the small flow condition on the head-flow curve. In this region, the operating condition of the pump device is extremely unstable.The flow characteristics of the "saddle" zone are calculated and analyzed by using the ANSYS-CFX numerical simulation method and the model test method, taking the rear bulb tubular pump device of Huai'an Station of the East Route of South-to-North Water transfer Project as the research object, and using the ANSYS-CFX numerical simulation method and the model test method to calculate and analyze the flow characteristics of the "saddle" zone.The flow characteristics are compared with those under design conditions.The results show that when the pump unit is running in the saddle area, the axial velocity distribution uniformity of the outlet section of the inlet passage is equal to the weighted average angle of the velocity, and the head loss of the front and back impellers.The distribution of velocity field and pressure field in flow passing parts can not meet the design requirements, and the hydraulic performance of large flow is better than that of small flow in saddle zone.
【作者单位】：江苏大学国家水泵及系统工程技术研究中心;江苏省灌溉总渠管理处;
【基金】：江苏省水利厅科技项目“7-10米扬程贯流泵水力模型设计以及稳定性研究”(2016043)
【分类号】：TV675

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