Vibratory Stresses in Propellers Operating in the Flow Field of a Wing- Nacelle-Fuselage Combination

摘要

An investigation has been male to determine the first-order vibratory stresses induced in propellers of conventional design when rotating in the flow field of a wing-nacelle-fuselage combination, and to thus enable careful evaluation of the steps essential to the prediction of these stresses. Thrust measurements were obtained by means of propeller-wake surveys in order to define the magnitude of the force changes (the oscillating air loads) experienced by the blades. Stress measurements were made simultaneously to obtain the propeller response to the oscillating air loads. Three- and four-blade, hollow, steel propellers having diameters of approximately 13 feet were used in the investigation.