摘要
为了研究导叶位置对双向竖井贯流泵水力性能与流态的影响,利用CFX14.5对6种导叶位置方案的双向竖井贯流泵在正向运转与反向运转时分别进行小流量工况(0.8Qdes)、设计流量工况与大流量工况(1.1Qdes)的定常计算,总计共36个工况。将数值模拟结果与泵装置外特性试验数据进行验证对比,并对计算结果进行水力性能与流态分析。研究结果表明:泵装置数值模拟结果与试验数据吻合度良好,最大相对误差小于5%。泵装置正向运转时,在小流量下,泵装置效率随导叶位置S增加而下降,S=40 mm时的导叶水力损失最大;但是在设计流量与大流量下,泵装置效率随导叶位置S增加而上升,S=100 mm时的导叶水力损失最小。泵装置反向运转时,导叶位置对泵装置水力性能与流态没有显著影响,综合考虑,选择导叶位置S=100 mm作为最终方案。
Two-direction tubular pump device can be adopted to meet the drainage and water transfer,so it was often used along Yangtze River and sea area. The analysis of hydraulic performance and internal flow becomes research hotspot. The two-direction tubular pump device consists of inlet flow passage,twodirection impeller,straight blade guide vane and outlet flow passage. In order to analyze the effect of guide vane position on hydraulic performance and flow pattern,the CFX14. 5 was used to obtain the steady flow field in pump device of six different guide vane positions under positive and reverse conditions. The SST model was chosen,and mass flow rate and total pressure were set at inlet and outlet,respectively. The interfaces between inlet flow passage and impeller,and between impeller and guide vane were set as ＂Frozen Rotor＂. The interface between guide vane and outlet flow passage was set as＂None＂. In addition,a smooth wall condition was used for the wall function. The results showed that good agreements between simulated and experimental results can be obtained,and the maximum relative error was less than 5%. Under positive rotation,for part-load condition,the efficiency was declined with the increase of guide vane position S and the maximum loss value in diffuser passage can be observed when S was 40 mm. However,for over-load condition and design condition,the efficiency was increased with the increase of S and the minimum loss value in diffuser passage can be obtained when S was100 mm. Under negative rotation,the effect of guide vane position on hydraulic performance was not obvious. In summary,the guide vane position S with value of 100 mm was optimal. The results can provide reference opinion for two-direction tubular pump device.
出处
《农业机械学报》
EI
CAS
CSCD
北大核心
2017年第2期135-140,共6页
Transactions of the Chinese Society for Agricultural Machinery
基金
"十二五"国家科技支撑计划项目(2015BAD20B01)
国家自然科学基金项目(51409123)
江苏省自然科学基金青年基金项目(BK20140554)
关键词
双向竖井贯流泵
导叶位置
水力性能
流态分析
two-direction tubular pump device
guide vane position
hydraulic performance
flow pattern analysis
