Accession Number : AD0768797

Title :   An Analytical and Experimental Study of Farfield Rotor Wake Geometry and Velocity

Descriptive Note : Master's thesis

Corporate Author : PENNSYLVANIA STATE UNIV STATE COLLEGE DEPT OF AEROSPACE ENGINEERING

Personal Author(s) : Egolf, Thomas A

PDF Url : AD0768797

Report Date : Aug 1973

Pagination or Media Count : 89

Abstract : All fixed wing aircraft generate trailing vortex wakes whose circulatory strength is dependent on flight conditions and aircraft geometry. A rotor also generates a vortex wake. A vortex sheet is shed from each blade. Each sheet rolls up rapidly outboard to form a tip vortex. The purpose of the study reported here is to estimate the rotor wake geometry and velocity field downstream of the rotor for the particular case where the rotor wake exhibits strong similarities to the fixed wing wake. A method is developed by which the helicopter far field wake can be readily compared to the far field wake generated by an equivalent wing.

Descriptors :   *HELICOPTER ROTORS, *ROTOR BLADES(ROTARY WINGS), AIRFOILS, DRAG, FLOW FIELDS, FLUID DYNAMICS, NUMERICAL ANALYSIS, THESES, VORTICES, WAKE

Subject Categories : Aerodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE