2008 02 No.50 98-102+136
圆柱绕流的流场特性及涡脱落规律研究
基金项目(Foundation):
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中文作者单位:
中国计量学院计量测试工程学院,中国计量学院计量测试工程学院,中国计量学院计量测试工程学院 浙江杭州310018,浙江杭州310018,浙江杭州310018
摘要(Abstract):
采用粒子图像测速技术对630、800及950三种雷诺数条件下的圆柱绕流场进行了实验,给出了圆柱下游沿流动方向4倍圆柱直径和垂直方向3倍圆柱直径区域内的速度场、涡量场以及涡脱落现象的时空演化规律.结果表明:圆柱尾流区域位于垂直方向约1.5~2.5倍圆柱直径范围内,随着雷诺数增大,这一范围呈现缩小趋势,而主流对涡的拉伸和输运能力有所增强;涡脱落频率随雷诺数增大而增大,小雷诺数时能够较为完整地捕捉到涡生成、脱落、发展和耗散过程,由于PIV采集频率的限制,大雷诺数条件下涡脱落整个过程不易被完整捕捉到.
关键词(KeyWords):
圆柱绕流;;粒子图像测速技术;;速度场;;涡量场;;涡脱落
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参考文献
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[2]WILLIAMSON C H K.Vortex dynamics in the cylinderwake[J].Annual Review of Fluid Mechanics,1996,28:477-539.
[3]WILLIAMSON C H K,GOVARDHAN R.Vortex-in-duced vibrations[J].Annual Review of Fluid Mechanics,2004,36:413-455.
[4]JULIO S.An investigation of the wake of a circular cylin-der using a video-based digital cross-correlation particle im-age velocimetry technique[J].Experimental Thermal andFluid Science,1996,12:221-233.
[5]LEE S J,DAICHIN.Flow past a circular cylinder over afree surface:Interaction between the near wake and the freesurface deformation[J].Journal of Fluids and Structure,2004,19:1049-1059.
[6]张玮,王元.圆柱绕流涡系演变的DPIV测试[J].空气动力学报,2002,15(4):381-387.
[7]刘宇,苏中地.不同雷诺数下方柱绕流的数值模拟[J].中国计量学院学报,2006,17(1):40-43.
[8]PRECE S J,SUMNER D.Flow visualization around a cir-cular cylinder near to a plane wall[J].Journal of Fluids andStructures,2002,16(2):175-190.
[9]SLAOUTI A,GERRARD J.An experimental investigationof the end effects on the wake of a circular cylinder towedthrough water at low Reynolds numbers[J].Journal ofFluid,1981,112:297-314.
[10]ZDRAVKOVICH M M.Flow around circular cylinders[M].Oxford:Oxford University Press,1997:4-5
[11]谢明亮,林建忠.边界层流场时空模式动力稳定性的数值计算及相互转换[J].中国计量学院学报,2007,18(2):89-95.
[12]周杏鹏,仇国富.现代检测技术[M].北京:高等教育出版社,2006:268-270.
基本信息:
DOI：
中图分类号:O357.1
引用信息:
[1]涂程旭,王昊利,林建忠.圆柱绕流的流场特性及涡脱落规律研究[J].中国计量学院学报,2008,No.50(02):98-102+136.
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