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CFD Simulation Paper 191297.2

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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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Mikail F Lumentut
National Taiwan University
Mahmoud Farag
American University in Cairo
mahmoud hafiz
Al-Azhar University
naveen noronha
Visvesvaraya Technological University