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Figure 2.36: Comparison of velocity uniformity along different sections Figure 2.37 shows the cross-sectional velocity contour at the potential testing section in the main channel. Figure 2.37(a) is the result from a smoothly curved trumpet, while Figure 2.37(b) is from a multi-linear trumpet. It illustrates that the “streamlined” version of the trumpet design produces a more uniform velocity distribution than the multi-linear one does along a long stretch of the straight channel downstream. TRACC/TFHRC Y2Q2 Page 55
(a) Streamline trumpet transition case (b) Multi-linear trumpet transition case Figure 2.37: Comparison of velocity uniformity along different sections in the test regime The configuration of honeycomb located between the diffuser and the trumpet plays a significant role in the orientation of the water streamlines. The simulation with and without the honeycomb for streamlined trumpet case is shown in Figure 2.38. The flow streamlines with the configured honeycomb in Figure 2.38(a) obviously have more uniform velocity and stay more coherent than the other case that does not have a honeycomb. Figure 2.38(b) shows a potential recirculation zone that consists of high variation in velocity and significantly warped streamlines. This may reduce the efficiency of the inlet and contribute to the increase of non-uniformity of the flow predicted in the main channel. TRACC/TFHRC Y2Q2 Page 56
Page 1 and 2:
ANL/ESD/12-27 Energy Systems Divisi
Page 3 and 4:
ANL/ESD/12-27 Computational Mechani
Page 5 and 6: List of Figures Figure 2.1: Bridge
Page 7 and 8: Figure 2.35: Two different transiti
Page 9 and 10: 1. Introduction and Objectives The
Page 11 and 12: 2. Computational Fluid Dynamics for
Page 13 and 14: flat surface assumption is good exc
Page 15 and 16: conditions from Example 1 defined i
Page 17 and 18: scour rate is initially highest nea
Page 19 and 20: Figure 2.6 Dividing streamline posi
Page 21 and 22: 2.1.3. Resolving Issues of the Seco
Page 23 and 24: educe the rate of increase for y wh
Page 25 and 26: Design Scour Depth 0.400 0.350 0.30
Page 27 and 28: extend the impact of the findings t
Page 29 and 30: Table 2.2 Contour plots comparing C
Page 31 and 32: Figure 2.14 Comparison of CFD and P
Page 37 and 38: consistent with the lab test setup,
Page 51 and 52: RMSD area area ( V1 V2 ) n area 2
Page 53 and 54: 2. Marian Muste, Hao-Che Ho, Daniel
Page 55: Honeycomb Streamline Trumpet Unifor
Page 59 and 60: 2.6. Training and Technology Transf
Page 61: Figure 2.40: Announcement for CFD t
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