Accession Number:

ADA129710

Title:

Free Wake Aerodynamic Analysis of Helicopter Rotors.

Descriptive Note:

Final rept. 17 Oct 79-26 May 83,

Corporate Author:

BOSTON UNIV MA CENTER FOR COMPUTATIONAL AND APPLIED DYNAMICS

Report Date:

1983-05-26

Pagination or Media Count:

99.0

Abstract:

A formulation for the free wake analysis of helicopter rotors in incompressible potential flows is presented here. The formulation encompasses both the theory and its numerical implementation. For the case of a single-bladed rotor in hover, the formulation is validated by numerical results which are in good agreement with the generalized wake of Landdgrebe. Extension of the theory to compressible flows is also outlined. These results indicate that the formulation does not require any empirical assumption such as the rate of contraction of the radius of the wake in order to avoid numerical instabilities. To our knowledge, the results presented here are the first ones ever obtained not requiring any ad-hoc assumptions in order to avoid such problems. Author

Subject Categories:

  • Helicopters
  • Theoretical Mathematics
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE