Naval Postgraduate School
Conpressibility Effects on Dynamic Stall of Oscillating Airfoils
Chandrasekhara_Compressibility_Effects_1990-08.pdf (1.399Mb)Date
1990-08-23Metadata
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A research proposal to investigate the "Compressibility Effects on Dynamic Stall
of Oscillating Airfoils" was submitted to ARO and the project was funded in April
1986. The aim was to obtain a basic understanding of the effect of compressibility
on the phenomenon of dynamic stall under typical flight conditions encountered by a
helicopter in forward flight., so that eventually a means for its control can be devised
and thus, its flight envelope can be expanded.
The initial phase of the study was devoted to building a drive system to produce
the necessary unsteady airfoil motion. A novel design was arrived at after reviewing
the various possibilities and was built. It uses a four-bar chain mechanism of which
the airfoil is one of the links.
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