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庄茜*,姜楠.用Tomo-TRPIV测量湍流边界层及拟序结构的空间模态[J].实验力学,2018,33(3):359~365
用Tomo-TRPIV测量湍流边界层及拟序结构的空间模态
Measurement of turbulent boundary layer and coherent structure spatial mode based on Tomo-TRPIV
投稿时间: 2017-02-05  最后修改时间: 2017-03-29
DOI:10.7520/1001-4888-17-017
中文关键词:  层析时间分辨粒子图像测速技术  湍流边界层  拟序结构  四极子  喷射  下扫  猝发
英文关键词:tomographic time-resolved particle image velocimetry technique  turbulent boundary layer  coherent structure  quadrupole  ejection  sweep  burst
基金项目:国家自然科学基金(11572221)、(11332006)、(11411130150)联合资助
作者单位
庄茜* 1.天津大学水利工程安全与仿真重点实验室 天津 300354 2.天津城建大学土木工程学院 天津 300384 
姜楠 1.天津大学机械工程学院 天津 300354 2.天津市现代工程力学重点实验室 天津 300354 
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中文摘要:
      层析时间分辨粒子图像测速(Tomographic Time-Resolved Particle Image Velocimetry,简称Tomo-TRPIV)技术是新近发展起来的一种先进的流体无接触测速技术,能够无干扰地测量流场的三个速度分量的三维空间分布。本文简要介绍了Tomo-TRPIV技术的基本原理、测量系统的主要组成和测量的主要步骤以及水槽中平板湍流边界层及其拟序结构的测量结果。实验证明,Tomo-TRPIV技术能够很好地测量平板湍流边界层对数律区的瞬时及平均流场,实验发现,在对数律区,平板湍流边界层中的拟序结构的涡量场主要以空间四极子的形式存在,四极子涡旋相互诱导,产生喷射和下扫等猝发事件,维持湍流边界层的发展演化。
英文摘要:
      Tomographic time-resolved particle image velocimetry (abbreviated as TRTomo-PIV)is a newly-developed advanced non-intrusive 3D-3C fluid velocimetry. It can measure the distribution of 3 velocity components in 3-dimensional velocity field without interference. The fundamental principle of Tomo-TRPIV, the main components of measurement system, the main measuring steps as well as measurement results of turbulent boundary layer and its coherent structure of flat plate turbulence in a flume are presented in this paper. Experimental results indicate that Tomo-TRPIV can measure the instantaneous and mean flow field in logarithmic-law region of turbulent boundary layer. Experiment reveals that in logarithmic-law region, the vorticity field of coherent structure in turbulent boundary layer exists mainly in the form of the space quadrupole. Quadrupole vortices are induced by each other, and generate burst events such as ejection and sweeping, which maintain the evolution of turbulent boundary layer.
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