|
|
Internal flow characteristic analysis on outlet conduit based on whole flow field |
ZHANG Fan, ZHANG Jinfeng*, ZHANG Xia, YUAN Shouqi, LI Yalin, XIE Liheng |
National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China |
|
|
Abstract In order to investigate the flow characteristics of the outlet conduit flow characteristics of the vertical axial-flow pump device, a certain pumping station was taken as the research object, and the numerical simulation was conducted on the model pump device based on the whole flow field. Combining with the turbulent kinetic energy, streamline distribution and pressure distribution, the dynamic characteristics of unsteady flow inside the outlet conduit was researched. Then, the Q criterion was used to analyze the vortex structure in the outlet conduit. Based on the eigenvalue method and the vorticity method, the vortex core was extracted from the outlet conduit under different working conditions in an unsteady rotation cycle. The results show that under part-load conditions, more vortex structure and vortex core could be captured at the inlet of outlet conduit, and these vortex gradually disappear along the exit direction. Besides, the strength of vortex core reduces gradually as the fluid flows from the entrance of the outlet conduit; the number of vortex under the designed condition is the least for the two methods; under the designed condition, there is no vortex core at the middle part.
|
Received: 13 April 2018
|
|
|
|
[1]严登丰. 泵站工程[M]. 北京: 中国水利水电出版社, 2005.[2]岳金文,李志鹏,秦武,等.基于目标电耗的城镇供水泵机组节能技术的研究及应用[J].流体机械,2017,45(5):46-50. YUE Jinwen, LI Zhipeng, QIN Wu, et al. Energy-saving technology research for water pump unit of urban Based on target power consumption and its implement[J]. Fluid machinery, 2017,45(5):46-50.(in Chinese)[3]顾巍, 成立, 蒋红樱,等. 立式轴流泵装置虹吸式出水流道水力特性CFD研究[J]. 江苏水利, 2018(1):7-15. GU Wei, CHENG Li, JIANG Hongying, et al. CFD study on the hydraulic characteristics of siphon outlet conduit of vertical axial flow pump[J]. Jiangsu water resources,2018(1):7-15.(in Chinese)[4]张帅帅, 蒋劲, 应锐,等. 某泵站全流道CFD仿真及流道改造研究[J]. 济南大学学报(自然科学版), 2018, 32(1):20-26. ZHANG Shuaishaui, JIANG Jin,YING Rui, et al. CFD simulation and passage reform of whole flow passage in a pumping station[J]. Journal of Jinan University(science and technology), 2018, 32(1):20-26.(in Chinese)[5]陈松山, 颜红勤, 周正富, 等. 泵站前置竖井进水流道三维湍流数值模拟与模型试验[J]. 农业工程学报, 2014(2):63-71. CHEN Songshan, YAN Hongqin, ZHOU Zhengfu, et al. Three-dimensional turbulent numerical simulation and model test of front-shaft tubular inlet conduit of pumping station[J]. Transactions of the CSAE, 2014(2):63-71.(in Chinese)[6]陈晓强, 郑源, 曹婷, 等. 出口段长度及弯肘段半径对肘形进水流道水力特性的影响[J]. 水电能源科学, 2013(12):217-220. CHEN Xiaoqiang, ZHENG Yuan, CAO Ting, et al. Export length and radius of elbow bend ancon section water flow hydraulic characteristics [J]. Hydropower energy science, 2013(12):217-220.(in Chinese)[7]梁金栋. 低扬程立式泵装置优化水力设计研究[D]. 扬州:扬州大学, 2012.[8]杨帆, 陈世杰, 李振,等. 不同转速时贯流泵装置出水流道水力性能分析[J]. 水动力学研究与进展, 2017(6):779-789. YANG Fan, CHEN Shijie, LI Zhen, et al. Effect of rotational speed on hydraulic performance on outlet conduit of tubular pumping system[J]. Hydrodynamic research and development, 2017(6):779-789.(in Chinese)[9]陆伟刚, 董雷, 王兆飞, 等. 流量与环量对低扬程泵装置流道水头损失的交叉影响[J]. 应用数学和力学, 2012(12):1431-1441. LU Weigang, DONG Lei, WANG Zhaofei, et al. Cross influence of discharge and circulation on head loss of the conduit of pump system with low head[J]. Applied mathematics and mechanics, 2012(12):1431-1441.(in Chinese)[10]陈国柱. 泵站出水流道基本流态研究[J]. 科技创新导报, 2014(17):27-28. CHEN Guozhu. Basic flow study on outlet conduit of pump station[J]. Science and technology innovation herald, 2014(17):27-28.(in Chinese)[11]黄良勇, 吴忠, 张啸,等. 大型双向流道泵装置优化匹配与试验研究[J]. 排灌机械工程学报, 2016, 34(7):602-607. HUANG Liangyong, WU Zhong, ZHANG Xiao, et al. Hydrodynamic optimization of large pump installation with two-way channel and experiment [J]. Journal of drainage and irrigation machinery engineering, 2016, 34(7):602-607.(in Chinese) |
|
|
|