Three-dimensional magnetic resonance velocimetry measurements of turbulence quantities in complex flow
Three-dimensional magnetic resonance velocimetry measurements of turbulence quantities in complex flow
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DOI：
10.1007/s00348-008-0559-4
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发表时间：
2009-02-01
影响因子：
2.4
通讯作者：
Eaton, John K.
中科院分区：
文献类型：
--
作者：
Elkins, Christopher J.;Alley, Marcus T.;Eaton, John K.
介绍了一种基于磁共振成像的、能够测量三维流场中湍流雷诺应力的磁共振测速实验技术。给出了基于台阶高度和台阶处自由流速度的雷诺数为48,000的方形通道中后向台阶流动的计算结果。将MRV结果与包含流向和横流轴的中心平面上的粒子图像测速(PIV)测量结果进行了比较。MRV和PIV平均速度测量显示出很好的一致性。雷诺法向应力的MRV测量结果与PIV结果的+/-20%以内相比，而湍流剪切的结果则不太准确。
A magnetic resonance velocimetry (MRV) experimental technique based on magnetic resonance imaging and capable of measuring the turbulent Reynolds stresses in a 3D flow domain is described. Results are presented in backward facing step flow in a square channel with a Reynolds number of 48,000 based on step height and freestream velocity at the step. MRV results are compared to particle image velocimetry (PIV) measurements in the centerplane containing the streamwise and cross-stream axes. MRV and PIV mean velocity measurements show excellent agreement. MRV measurements for Reynolds normal stresses compare to within +/- 20% of the PIV results while results for the turbulent shear are less accurate.