Study of Rotor Configurations for Minimum Power and Rotor-Wake Pressure Distributions

摘要

Two independent tasks are included as follows: Task I - Develop a method for analytically determining rotor planform and twist distribution to minimize the power required by a hovering or slowly advancing rotor. Task II - Predict the time-varying pressure distribution on a smooth surface due to a hovering rotor. Under Task I, the mathematical developments required were completed and are discussed. The Task II effort was made in support of research being carried out concerning the transmission of sound energy across a water interface. Digital computer calculations of the unsteady static pressures on a smooth ground plane directly beneath a hovering rotor were performed for two separate rotor configurations. (Author)