Investigation on full field three-dimensional flow in a multi-pass channel based on Magnetic Resonance Velocimetry (MRV)
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摘要: 核磁共振成像测速技术（MRV）因其无需复杂的光学系统，能够快速测量复杂结构全场三维三分量速度分布的独特优势，正在成为流场精细化研究的重要手段。在研究MRV关键技术的基础上，成功测得了三流程蛇形通道内的全场三维速度分布。结果表明，MRV能够高分辨率精确解析多流程通道内复杂的三维流动特征及其沿流程演变；从全场三维速度分布可以发现，弯道附近流动具有复杂的三维特征；弯道附近从通道中心向上下端壁及侧壁的二次流明显，直角弯道和U型弯道及其下游都存在清晰的迪恩涡；流体在迪恩涡的驱动下冲击上下端壁，是当地传热强化的主要原因。Abstract: Magnetic Resonance Velocimetry (MRV) has the unique advantage of rapidly measuring three-dimensional three-component (3D3C) velocity distributions in complex structures, meanwhile it doesn’t need complex optical systems and tracer particles. MRV has become an important means for the study of full flow field. The full-field 3D velocity distribution in a three-pass serpentine channel was measured successfully. Results indicate that MRV has the ability to accurately resolve the complex 3D flow characteristics in the multi-pass channel. From the full-field 3D velocity distribution, it could be found that the flow near the bends has complex 3D features. The secondary flow is obvious on the cross-sections near the bends, which directs from the center of the channel to the upper and lower end walls. Dean vortices were observed in the right-angle bend, U-shaped bend and their downstream clearly. Flow driven by the Dean vortex directs to the upper and lower end walls, which is believed to be the essential reason for local heat transfer enhancement.
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图 1 单方向速度编码二维扫描序列
Figure 1. Two-dimensional scanning sequence with single-direction velocity encoding
图 4 多流程通道流动测量实验系统图
Figure 4. Illustration of flow measurement experiment system for multi-pass channel
图 6 不同高度平面二维速度大小分布云图
Figure 6. The distribution of 2D velocity magnitude in the planes of different heights
图 8 不同截面来流速度分布云图
Figure 8. The distribution of incoming flow velocity in different slices
图 9 z/H = 0平面来流动速度分布曲线
Figure 9. Incoming flow velocity distribution curves in z/H = 0 plane
图 11 y/H = 7平面来流动速度分布曲线
Figure 11. Incoming flow velocity distribution curves in y/H = 7 plane
图 12 直角弯道z/H = 0平面局部速度分布
Figure 12. Local velocity distribution in z/H = 0 plane near the right-angle bend
图 13 直角弯道不同截面速度分布云图/直角弯道二次流发展
Figure 13. Velocity distribution in different slices near the right-angle bend / Secondary flow development near the right-angle bend
图 14 直角弯道下游二次流发展
Figure 14. Secondary flow development downstream of the right-angle bend
图 16 U型弯道z/H = 0平面局部速度分布
Figure 16. Local velocity distribution in z/H = 0 plane near the U-shape bend
图 17 U型弯道不同截面速度分布云图/U型弯道二次流发展
Figure 17. Velocity distribution in different slices near the U-shape bend / Secondary flow development near the U-shape bend
图 20 z/H=-0.4平面z向速度分布云图
Figure 20. Z-directional velocity distribution in z/H=-0.4 plane
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