Accession Number:

ADA210317

Title:

Unsteady Gas Dynamics Problems Related to Flight Vehicles

Descriptive Note:

Final rept. 1 Apr 1974-31 Mar 1979

Corporate Author:

STANFORD UNIV CA DEPT OF AERONAUTICS AND ASTRONAUTICS

Personal Author(s):

Report Date:

1979-05-01

Pagination or Media Count:

17.0

Abstract:

Report summarizes the findings of a five-year program devoted to improving fundamental knowledge on unsteady aerodynamic phenomena related to flight vehicles and on associated aeroelastic problems. With regard to minimum- weight structural optimization with aeroelastic constraints, both new results and new methods of solution for free and forced motion were published. The effect of chordwise-force components on flutter of large aspect ratio wings proved often to be unfavorable. Improved steady and unsteady theories were published for the loading of vertical-axis wind turbines, and discoveries were made regarding free vibration of their curved blades. It was learned how to adapt linear theory for simple harmonic oscillation to cover arbitrary small motion, with applications to automatic control. A nonlinear approach was published for transient lifting airloads at low speeds. A study was undertaken on aerodynamics useful for the analysis of variable-geometry propulsive devices. An approximate scheme was devised for highlighting the importance of partial- chord shocks for transonic aeroelastic stability, their influence proving often large and unfavorable.

Subject Categories:

  • Aerodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE