后置灯泡式贯流泵装置水力模型

Hydraulic model and its pilot-plant unit for rear bulb-type cross-flow pump

为了能够满足在南水北调东线一期工程中低扬程大流量工况的要求,针对南水北调金湖等泵站研制开发的贯流泵装置水力模型,利用FLUENT软件进行了CFD流场计算分析,并进行了反复试验和优化设计.经过江苏大学初试和河海大学复试,结果基本相符.模型在2.82 m扬程下,流量为342 L/s,效率达到79.05%,汽蚀比转速为1 105;装置模型流量大,效率高,综合性能指标达到南水北调工程经国际招标的同类装置模型的先进水平;在3 m扬程下和相同性能的立式轴流泵相比,效率约提高5%,流量提高10%以上,综合性能优势明显.

According to the pump requirements of middle and low delivery lift and large flow capacity for the first-stage construction in South-to-North Water Transfers Eastern Route Project, and the actual pump characteristics in Jinhu Pump Station, a hydraulic model and its pilot-plant unit for the cross-flow pump were built. The flow field was calculated and analyzed by computational fluid dynamics （CFD） with FLUENT code, and the hydraulic model was optimized by repeated trials in the pilot cross-flow pump. The simulating results calculated by the hydraulic model（ named JGZM-3 ） coincided with the actual results from the pretest in Jiangsu University and the retest in Hohai University. The testing parameters from the pilot cross-flow pump were as follows： delivery lift 2.82 m, flow capacity 342 L/s, power efficiency 79.05%, and cavitation specific speed 1 105. The pilot pump has the characters of large flow capacity and high power efficiency; and its overall performance indexes reach the advanced level, as the foreign made products. Compared with a like vertical axial-flow pump, the pilot cross-flow pump raised the power efficiency over 5% and flow capacity over 10%.