变流量工况下熔盐泵性能仿真实验  

Performance Simulation of the Molten Salt Pump under Variable Flow Conditions

作　　者：程文洁[1] 王赛赛[1] 周勇军[1] 

机构地区：[1]南京工业大学机械与动力工程学院,南京211816

出　　处：《实验室研究与探索》2017年第3期31-35,共5页Research and Exploration In Laboratory

基　　金：江苏省大学生创新训练项目(2016DC275)

摘　　要：为了提高高温熔盐泵的水力性能,采用数值模拟仿真实验,对不同流量、不同叶片数(z=5,6,7)熔盐泵内部定常流动进行了数值模拟分析。结果表明:3个模型泵内压力分布相似,出口处静压最大,其大小顺序为:p_(s-z7)>p_(s-z6)>p_(s-z5);小流量工况下(0.4Q,0.6Q)蜗舌附近流道内存在明显的漩涡(Ⅲ、Ⅳ两个象限),且漩涡随着流量增加而减小,当流量达到Q以后各个流道内的漩涡消失;泵的扬程随着流量的增加不断减小,在0.8Q^1.1Q之间扬程下降较快,同一流量下z=7泵的扬程明显高于其他两个模型泵;叶片数的改变对此结构熔盐泵影响不是很大,从性能曲线的对比可以看出,z=7泵略优于其他叶片数泵,熔盐泵在0.8Q^1.1Q之间工作效率较高。该研究可为揭示熔盐泵内部流动现象提高熔盐泵水力性能提供参考。To enhance the hydraulic performance of the molten salt pump, the steady flow in the molten salt pump was studied numerically based on the simulation experiment. Under different flow rates, the internal flow fields in the pumps with different blade number were systematically simulated. The results revealed that the pressure distribution in the three model pumps are similar, the largest static pressure appears at the volute outlet, and Ps-z7 〉Ps-z6 〉Ps-z5. There are obvious vortex in the flow passage （ Ⅲ , Ⅳ quadrants） near the volute tongue under low flow rate conditions （0.4Q,0.6Q） , and the vortex decreases with the increase of flow, when the flow rate reaches Q the vortex disappear. The pump head decreases with the increase of flow rate, and the head fails faster between 0.8Q - 1.1 Q. Moreover, the z = 7 pump has higher head than that of the other two pumps under the same flow rate. Changing of blade number has little influence on this structure of molten salt pump, it can be seen from the comparison of performance curves, z = 7 pump is slightly better than the other blade number pumps, and the molten salt pump has better efficiency between 0.8Q - 1.1Q. These results can be taken as references on the development of high-performance molten salt pump.

关 键 词：变流量 熔盐泵 叶片数 小流量 

分 类 号：TH311[机械工程—机械制造及自动化]