The large reverse flow region of the rotor with a high advance ratio is an important factor that affects performance improvement helicopters. This paper examines dynamic stall airfoil in to develop set pressure measurement systems for low region. pitch oscillation experiment NACA0018 and out has been carried out, influence motion parameters on stalls studied. results show more likely under stat...

Abstract Unsteady aerodynamic phenomena appearing close to the stall boundary in axial fans and compressors have been subject of extensive investigations. A particular phenomenon known as “rotating instabilities” typically occurs tip region at highly loaded conditions is often linked blade vibrations. During rig engine testing, it usually identified by characteristic shape its pressure spectra....