NASA Technical Reports Server (NASA) · 1987 · 15 citations · 0 references
EngineeringAerospace EngineeringMechanical EngineeringAerodynamicsComputational Fluid DynamicsComputational MechanicsExperimental AerodynamicsFlight SimulationRotor DynamicsRotorcraft AerodynamicsRotordynamicsWake Field AnalysisFree Wake AnalysisGround EffectGround Effect AerodynamicsRotor AerodynamicsRotor Blade AerodynamicsRotor Blade LoadsWake AnalysisWake Modeling
The objective of this work is to develop a computer program which analytically estimates the wake geometry, vorticity, and velocity distribution over a rotor and in the neighboring airflow for a variety of conditions in and out of ground effect. The resulting wake is used to provide an assessment of the blade loading distribution for various hover and low speed flight conditions. The computer program is based on a lifting line free wake model and provides stable solutions for a variety of steady state conditions, including ground effect and forward flight. The wake program was validated by comparing the computed wake geometry and experimental test data for two different rotors.