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›› 2011, Vol. 11 ›› Issue (4): 541-548.

• 流动与传递 • 上一篇    下一篇

翼型桨叶片尾涡结构的PIV实测与LES模拟研究

蔡清白 戴干策   

  1. 上海华谊集团技术研究院 过程开发研究所 华东理工大学化学工程联合国家重点实验室
  • 收稿日期:2011-02-12 修回日期:2011-05-03 出版日期:2011-08-20 发布日期:2011-08-20
  • 通讯作者: 蔡清白

Measurement of Trailing Vortices around a Hydrofoil Impeller with PIV and Large Eddy Simulation

CAI Qing-bai DAI Gan-ce   

  1. Technology Research Institute of Shanghai HuaYi Group State Key Laboratory of Chemical Engineering, East China University of Science and Technology
  • Received:2011-02-12 Revised:2011-05-03 Online:2011-08-20 Published:2011-08-20
  • Contact: CAI Qing-bai

摘要: 在塔径383 mm、高径比为1的翼型桨搅拌反应器内,采用粒子图像测速(PIV)技术和大涡模拟(LES)研究了一种翼型桨的叶片尾涡结构. 对比二维PIV技术测定的翼型桨搅拌反应器平均速度场数据,验证了LES方法的可靠性. 并通过叶片端的速度矢量场、叶片区内的涡量大小及湍动能分布清楚地识别了翼型桨叶片尾涡结构. 发现该叶片尾涡为单涡结构,其尾涡轴心轨迹几乎就在桨叶尖划过的圆柱面上. 此外,还探讨了叶片尾涡对湍动能分布、湍流特性等的影响,表明最大无因次湍动能k/Vtip2约为0.04~0.06,其位置约在0.5

关键词: 翼型桨, 粒子图像测速, 大涡模拟, 叶片尾涡

Abstract: The trailing vortices around a hydrofoil impeller were investigated in a 0.383 m i.d. stirred tank with a 0.188 m i.d. hydrofoil impeller using PIV and LES. The comparison between angle-averaged axial velocities by LES and PIV data was in very good agreement, verifying the validity and effectiveness of LES simulation. The presence of trailing vortices formed around the hydrofoil impeller blades were indicated by the mean velocity vectors near the edge of blades, the contours of turbulence levels and kinetic energy of turbulence. It was found that single trailing vortex formed around each blade. The vortex axis was identified to fall on the cylinder swept by the blade tip. The effect of trailing vortices on the turbulence structure was also discussed. The maximum normalized kinetic turbulence energy k/Vtip2 was about 0.04~0.06, which was located at 0.5

Key words: hydrofoil impeller, particle image velocimetry, large eddy simulation, trailing vortex

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