Accession Number:

ADA149240

Title:

Application of the ONERA (Office National d'Etudes et de Recherches Aerospatiales) Model of Dynamic Stall.

Descriptive Note:

Technical rept.,

Corporate Author:

NATIONAL AERONUATICS AND SPACE ADMINISTRATION MOFFETT FIELD CA AMES RESEARCH CENTER

Personal Author(s):

Report Date:

1984-11-01

Pagination or Media Count:

65.0

Abstract:

A semiempirical model, developed at the Office National DEtudes et de Recherches Aerospatiales to predict the unsteady loads on an airfoil that is experiencing dynamic stall, is investigated. This study describes the math model from an engineering point of view, demonstrates the procedure for obtaining various empirical parameters, and compares the loads predicted by the model with those obtained in the experiment. The procedure is found to be straightforward, and the final calculations and measurements also indicate that a decrease in accuracy results when the values of both the reduced frequency and the amplitude of oscillation are large. Potential quantitative improvements in the accuracy of the calculations are discussed in terms of accounting for both the hysteresis in the static data and the effects of stall delay in the governing equations. Author.

Subject Categories:

  • Helicopters
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE