DRAG MEASUREMENTS IN A STREAM WITH SINUSOIDALLY FLUCTUATING VELOCITY IN THE LONGITUDINAL DIRECTION
ARMY AVIATION MATERIEL LABS FORT EUSTIS VA
Pagination or Media Count:
The drag coefficients of cylinders and plates in a stream with sinusoidal fluctuations in velocity are investigated. A tube with counterrotating vanes at the rear is used to produce the flow fluctuations. This tube was placed in the open jet of a low speed tunnel. The models were mounted on a vertical sting, which supported the one-component force transducer. The drag coefficients, based on average values of drag and dynamic pressure, show no variation with frequency parameter changes. The fluctuating component of drag does show a dependence on the frequency parameter. Also, a phase shift is noticed between the velocity and the force.
- Atmospheric Physics
- Fluid Mechanics