Wind Tunnel Investigation of Aeolian Tones from Rough Surface Cylinders

1986 ◽  
pp. 421-428
Author(s):  
F.-R. Grosche
Keyword(s):  
Wind Tunnel ◽  
Rough Surface

Wind-Tunnel Tests on Attitude Change due to Rough Surface of Reentry Capsule

2020 ◽  
Vol 2020 (0) ◽  
pp. OS11-05
Author(s):  
Koju HIRAKI ◽  
Akihiro AOKI ◽  
Yu HANDA
Keyword(s):  
Wind Tunnel ◽  
Rough Surface ◽  
Attitude Change ◽  
Wind Tunnel Tests

Drag and lift measurements of solid sports balls in still air

2017 ◽  
Vol 232 (3) ◽  
pp. 255-263 ◽  
Author(s):  
Jeff R Kensrud ◽  
Lloyd V Smith
Keyword(s):  
Surface Roughness ◽  
Wind Tunnel ◽  
Drag Coefficient ◽  
Rough Surface ◽  
Lift Coefficient ◽  
Laboratory Setting ◽  
Air Drag ◽  
High Speeds ◽  
Drag And Lift ◽  
Lift And Drag

The following article considers lift and drag measurements of solid sports balls propelled through still air in a laboratory setting. The balls traveled at speeds ranging from 26 to 134 m/s with spin rates up to 3900 r/min. Light gates measured the speed and location of the balls at two locations from which lift and drag values were determined. Ball roughness varied from polished to rough surface protrusions, that is, seams as high as 1.5 mm. Lift and drag were observed to depend on speed, spin rate, surface roughness, and seam orientation. A drag crisis was observed on smooth balls as well as non-rotating seamed balls with seam heights less than 0.9 mm. The drag coefficient of approximately 0.42 was nearly constant with speed for spinning seamed balls with seam height greater than 0.9 mm. The still air drag coefficient of smooth balls was comparable to wind tunnel drag at low speeds ( Re < 2 × 105) and higher than wind tunnel results at high speeds ( Re > 2 × 105). The lift and drag coefficients of spinning balls increased with increasing spin rate. The lift coefficient of baseballs was not sensitive to ball orientation or seam height.

A wind tunnel study of dense gas dispersion in a neutral boundary layer over a rough surface

2001 ◽  
Vol 35 (13) ◽  
pp. 2243-2252 ◽  
Author(s):  
Alan Robins ◽  
Ian Castro ◽  
Paul Hayden ◽  
Nathan Steggel ◽  
Daniele Contini ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Wind Tunnel ◽  
Rough Surface ◽  
Dense Gas ◽  
Gas Dispersion ◽  
Neutral Boundary Layer ◽  
Wind Tunnel Study

A wind tunnel study of dense gas dispersion in a stable boundary layer over a rough surface

2001 ◽  
Vol 35 (13) ◽  
pp. 2253-2263 ◽  
Author(s):  
Alan Robins ◽  
Ian Castro ◽  
Paul Hayden ◽  
Nathan Steggel ◽  
Daniele Contini ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Wind Tunnel ◽  
Rough Surface ◽  
Stable Boundary Layer ◽  
Dense Gas ◽  
Gas Dispersion ◽  
Stable Boundary ◽  
Wind Tunnel Study

Theory of the kinetic coefficients of the atomically rough surface of 4He crystals

1983 ◽  
Vol 44 (6) ◽  
pp. 723-736 ◽  
Author(s):  
R.M. Bowley ◽  
D.O. Edwards
Keyword(s):  
Rough Surface ◽  
Kinetic Coefficients

Automated Fiber Placement of Composite Wind Tunnel Blades: Process Planning and Manufacturing

2019 ◽  
Author(s):  
Ramy Harik ◽  
Joshua Halbritter ◽  
Dawn Jegley ◽  
Ray Grenoble ◽  
Brian Mason
Keyword(s):  
Wind Tunnel ◽  
Process Planning ◽  
Fiber Placement ◽  
Automated Fiber Placement
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