Wide Angle Diffuser
Corner Vanes
Screens
Settling Chamber
Flow Direction
Test Section
Axial Fan
Exit Diffuser
Contraction
Screens
Honeycomb
Fig. 1: Conventional wind tunnel design
Final Manuscript 4505-PMS, Gordon & Imbabi 22
Fig. 2: Square bend: velocity vector plot, Re=10
4
Honeycomb
Exit Diffuser
Test Section
Flow Direction
Contraction
Screens
Settling Chamber
Wide Angle Diffuser
Axial Fan
Screens
Corner Vanes
Fig. 1: Conventional wind tunnel design
Fig. 2: Square bend: velocity vector plot, Re=104
Final Manuscript 4505-PMS, Gordon & Imbabi
22
Fig. 3: 180o bend: velocity vector plot, Re=104
Final Manuscript 4505-PMS, Gordon & Imbabi
23
Fig. 4: Diffuser/ contraction section, no screens: velocity vectors, Re=104
Final Manuscript 4505-PMS, Gordon & Imbabi
24
Fig. 5: Diffuser/ contraction section, one screen: velocity vectors, Re=104
Final Manuscript 4505-PMS, Gordon & Imbabi
25
Fig. 6: Diffuser with guiding vanes and screen: speed contour plot, Re=50
Final Manuscript 4505-PMS, Gordon & Imbabi
26
Final Manuscript 4505-PMS, Gordon & Imbabi
27
Fig 7: Speed contour plots of various guiding vane settings, Re=104
Final Manuscript 4505-PMS, Gordon & Imbabi
28
Fig. 8: 3D velocity vector plot of final tunnel design, Re=200
Final Manuscript 4505-PMS, Gordon & Imbabi
29
Velocity Profile 0.25 m From Contraction (No Screens)
12
Velocity (m/s)
10
8
6
4
Max
Mean
Min
2
0
0
50
100
150
200
250
Distance From Base of Test Section (mm)
Fig. 9: Velocity profile, no screens
Final Manuscript 4505-PMS, Gordon & Imbabi
30
Velocity Profile 0.25 m From Contraction ( 2 Screens)
12
Velocity (m/s)
10
8
6
4
Max
Mean
Min
2
0
0
50
100
150
200
250
Distance From Base of Test Section (mm)
Fig. 10: Velocity profile, 2 screens
Final Manuscript 4505-PMS, Gordon & Imbabi
31
Velocity Profile 0.25 m From Contraction ( 2 Screens)
12
Velocity (m/s)
10
8
6
4
Max
Mean
Min
2
0
0
50
100
150
200
250
Distance From Base of Test Section (mm)
Fig. 11: Final tunnel velocity profile
Final Manuscript 4505-PMS, Gordon & Imbabi
32
Fig 12: Speed contour plots for final tunnel design, Re=104
Final Manuscript 4505-PMS, Gordon & Imbabi
33
Fig 13: Simulated velocity profile, with 2 screens
Final Manuscript 4505-PMS, Gordon & Imbabi
34
Plate 1: Photograph of the completed tunnel
Final Manuscript 4505-PMS, Gordon & Imbabi
35
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National Taiwan University
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Al-Azhar University
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