灯泡贯流泵装置内部流动及水力特性  

Flow pattern and hydraulic performance of tubular pump

作　　者：成立[1] 刘超[1] B.P.M.van Esch 汤方平[3] 金燕[1] 周济人[1] 

机构地区：[1]扬州大学水利科学与工程学院,江苏扬州225009 [2]埃因霍温理工大学机械工程系 [3]扬州大学能源与动力工程学院,江苏扬州225009

出　　处：《排灌机械工程学报》2012年第4期436-441,共6页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家自然科学基金资助项目(50809057;51179167);国家基金委国际(地区)合作与交流项目(51010105026);教育部留学出国人员科研启动基金资助项目(教外司留[2010]1561号)

摘　　要：为了深入研究灯泡贯流泵装置内部流动与水力特性之间的联系,采用数值计算、性能试验与PIV流场测试方法,获得了灯泡贯流泵装置在大流量、小流量和最优工况下的流动和水力特性.采用RNG紊流模型和SIMPLEC算法,基于多旋转坐标系模型,计算了灯泡贯流泵内部定常流动.分析了泵装置内部流动,指出小流量工况下泵叶轮的进口有较大范围的旋涡区,出水灯泡体内流态较为紊乱;而在最优工况及大流量工况下,泵装置内未见明显回流区.研究表明,灯泡贯流泵进水流道水力损失符合传统管道内局部水力损失规律,而出水流道的水力损失表现为与泵装置运行工况相关的规律,最优工况点附近损失最小,小流量和大流量工况点水力损失均较大.计算结果与二维PIV流动测试结果均表明在小流量下进口近泵壳侧有明显的回流区,而在叶轮出口靠近轮毂处有大面积的脱流.因此,灯泡贯流泵装置优化水力设计应当重视小流量工况下叶轮和导叶处的流动特性.In order to establish a relationship between flow pattern and hydraulic performance of a tubular pump, the flow pattern and hydraulic performance at a low flow rate, best efficiency point and a high flow rate were investigated by means of flow simulation, performance test and PIV measurement in a tubular pump. The steady flow field in the pump was obtained through solving the time-averaged N - S equations in the multiple reference frames （MRF） with the help of the SIMPLEC algorithm and the RNG k -e turbulence model. The flow patterns in the pump were analyzed at different operating points. There was a large recirculation zone before the blades inlet when the pump operated at the low flow rate. The flow patterns were fine and there was no any reverse flow regions in the pump when it worked at the BEP （Best Efficiency Point） and the high flow rate. The results indicated the hydraulic loss in the suction pipe is similar to that in a normal pipe, but the hydraulic loss in the discharge pipe depended on operating points. A minimum hydraulic loss in the discharge appeared at the BEP. The estimated performance was in agreement with the test data, both the predicted flow patterns and the PIV measurements showed that there was remarked reverse flow region in front of blades near the tip and there existed a large separated flow zone near the hub downstream of blades at the low flow rate. Thus, attention should be paid on the flow pattern in impeller and guide vanes at a low flow rate in the optimal design of such a tubular pump.

关 键 词：贯流泵 流态 水力性能 泵装置 数值模拟 

分 类 号：S277.9[农业科学—农业水土工程] TV131.4[农业科学—农业工程]