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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 byTomo-TRPIV
投稿时间: 2017-02-05  最后修改时间: 2017-03-29
DOI:
中文关键词:  层析粒子图像测速技术,湍流边界层,拟序结构,四极子,喷射,下扫,猝发
英文关键词:tomo-PIV,turbulent boundary layer,coherent structure,quadrupole,eject,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E-mail
姜楠 天津大学 力学系 nanj@tju.edu.cn 
庄茜 天津城建大学土木工程学院  
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中文摘要:
      层析粒子图像测速技术(Tomographic Particle Image Velocimetry, 简称Tomo-PIV)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。本文简要介绍了层析粒子图像测速技术的基本原理,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。实验证明层析粒子图像测速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 Particle Image Velocimetry (Tomo-PIV)is a new-developed non-intrusive 3D-3C fluid velocimemtry. It can measure the three velocity comconents in 3D flow field non-intrusively. The fundamental principle, the main composition of measurement system and the main measuring procedure are presented as well as the measured results of coherent strucutre in turbulent boundary layer in a water channel. The experiments indicate that tomo-PIV can measure the instantaneous and mean flow field of logarithmic-law region in a turbulent boundary layer. In the logarithmic-law region , the typical vorticity field for coherent structure behaves as a quadrupole mode. The vortexes in the quadrupole induce each other leading the burst events such as ejection and sweep which maintain the development and evolution of turbulent boundary layer.
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