Analysis on 3D full flow field in a cooling channel with diamond pin fins based on MRV
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摘要:
在研究核磁共振成像测速（MRV）技术测速核心方法的基础上，成功实现了在10 min内对大宽高比肋柱通道200×100×25个空间点上三维全场速度的测量，并对流场结构进行了深入的解析。将MRV测得的通道中心截面速度分布与粒子成像测速（PIV）的实验结果进行了对比，两者吻合良好。利用MRV测得的空间三维速度分布解析了菱形肋柱与端壁附近复杂的三维流场与涡量场，发现端壁附近流体靠近肋柱时，先向下冲击端壁，仅在肋柱前缘两侧形成马蹄涡，随后绕过肋柱两侧尖角处向上抬升，端壁边界层内的涡，迅速演变为肋柱两侧尖角附近以及下游的剪切层涡。
Abstract:Based on the study of core method of magnetic resonance imaging velocimetry (MRV), the 3D velocity field of 200×100×25 spatial points in a large aspect ratio channel with pin fins was obtained in 10 min successfully, and the flow field was resolved deeply. The velocity distribution in the mid-plane of channel measured by MRV was compared with the experimental results of particle imaging velocimetry (PIV), which were in good agreement. The 3D velocity distribution measured by MRV presented the complex 3D flow field and vorticity field distribution around diamond pin fin and end wall. It was found that when the fluid near the end wall approached to pin fin, it impinged the end wall firstly and horseshoe vortex only occurred on both sides of the leading point. Then fluid climbs up around the sharp corners on both sides of the pin fin, and the vortex in the end wall boundary layer rapidly evolved into shear layer vortex near the sharp corners on both sides of the pin fin and downstream section.
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图 3 大宽高比肋柱冷却通道流动测量实验系统示意图
Figure 3. Illustration of flow measurement experiment system for large aspect ratio channel with pin fins
图 5 大宽高比菱形肋柱通道三维速度大小分布云图
Figure 5. Distribution of 3D velocity magnitude in a large aspect ratio channel with diamond pin fins
图 6 PIV和MRV中间截面速度分布对比
Figure 6. Comparison of velocity distribution in the mid-plane of PIV and MRV
图 7 X/D=1.1处流向速度分布曲线对比
Figure 7. Comparison of streamwise velocity distribution curves at X/D=1.1
图 8 X/D<−2区域
$ {\bar{u}}^{+} $ 随Z+变化曲线Figure 8.
${\bar{u}}^{+}$ versus Z+ in the region of X/D<−2
图 10 X/D=0，Y/D=1处肋柱周围部分流线分布
Figure 10. Streamlines distribution around pin fin located at X/D=0 and Y/D=1
图 11 X/D=0，Y/D=1处肋柱周围涡线分布
Figure 11. Vortexlines distribution around pin fin located at X/D=0 and Y/D=1
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