Accession Number:

AD0762592

Title:

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

Descriptive Note:

Corporate Author:

CALIFORNIA UNIV LOS ANGELES SCHOOL OF ENGINEERING AND APPLIED SCIENCE

Personal Author(s):

Report Date:

1973-04-01

Pagination or Media Count:

58.0

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

Subject Categories:

  • Aerodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE