Abstract
2D3C TR-PIV technique was utilized to investigate streamwise-oriented vortical structures behind an inclined flat plate. The angle of attack was set to 7 deg, several fields of view in the wake were investigated. The instantaneous velocity vector fields were captured, dynamics of the flow was studied using POD method. The streamwise structures are determined by vorticity and low- and high-velocity streaks are defined. The acquired results are in a good agreement with the new hypothesis of a principle of flight.
Highlights
The invention of a wing is more than a hundred years old
This experimental research is a reaction to the new ideas about principle of lift and flight by Hoffman and Johnson [1, 2]. This new hypothesis determine the streamwise vortical structures over and behind the airfoil as the main source of the lift force generation. This streamwise vorticity is developed as a consequence of the instabilities of the boundary layer developing under adverse pressure gradient of the suction side of the airfoil
This article was dealing with preliminary results of evolution of flow structures behind the inclined plate obtained using time-resolved stereo PIV technique
Summary
There are some doubts recently, how the lift force is generated This experimental research is a reaction to the new ideas about principle of lift and flight by Hoffman and Johnson [1, 2]. This new hypothesis determine the streamwise vortical structures over and behind the airfoil as the main source of the lift force generation. This streamwise vorticity is developed as a consequence of the instabilities of the boundary layer developing under adverse pressure gradient of the suction side of the airfoil. Several parallel planes were investigated along longitudinal direction and the evolution of streamwise vorticity was observed
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