Accession Number : AD0762592

Title :   Extraction of Flow Energy by Gliding in a Wind with Uniform Vertical Shear,

Corporate Author : CALIFORNIA UNIV LOS ANGELES SCHOOL OF ENGINEERING AND APPLIED SCIENCE

Personal Author(s) : Hendriks,Ferdinand

Report Date : APR 1973

Pagination or Media Count : 58

Abstract : Gliding in non-uniform wind offers the opportunity of energy extraction by a glider. It has long been suggested that albatrosses in particular use this form of locomotion. The main problem is how to control a glider to maximize the energy gained. For three-dimensional motion, circling in a uniform shear flwo, the solution of the equations of motion by a perturbation method indicates that a synchronization of turning and phugoid frequency is required to stay aloft. For purely two-dimensional motion, it is shown that small periodic variations of the lift coefficient leads to a deterioration of glide performance. An example based on numerical integration suggests that dynamic soaring by albatrosses in the atmospheric boundary layer is not an impossibility. (Author)

Descriptors :   (*GLIDERS, *NONPOWERED FLIGHT), WIND, BOUNDARY LAYER, TURBULENCE, FLIGHT PATHS, TURNING FLIGHT, FLUID DYNAMICS, MATHEMATICAL MODELS

Subject Categories : Aerodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE