Accession Number:

ADA525812

Title:

CFD Simulations of Tiltrotor Configurations in Hover

Descriptive Note:

Conference paper

Corporate Author:

ARMY AVIATION-MISSILE RESEARCH DEVELOPMENT-ENGINEERING CENTER MOFFETT FIELD CA AEROFLIGHTDYNAMICS DIRECTORATE

Personal Author(s):

Report Date:

2002-06-01

Pagination or Media Count:

17.0

Abstract:

Navier-Stokes computational fluid dynamics calculations are presented for isolated, half-span, and full-span V-22 tiltrotor hover configurations. These computational results extend the validity of CFD hover methodology beyond conventional rotorcraft applications to tiltrotor configurations. Computed steady-state, isolated rotor performance agrees well with experimental measurements, showing little sensitivity to grid resolution. However, blade-vortex interaction flowfield details are sensitive to numerical dissipation and are more difficult to model accurately. Time-dependent, dynamic, half- and full-span installed configurations show sensitivities in performance to the tiltrotor fountain flow. As such, the full-span configuration exhibits higher rotor performance and lower airframe download than the half-span configuration. Half-span rotor installation trends match available half-span data, and airframe downloads are reasonably well predicted. Overall, the CFD solutions provide a wealth of flowfield details that can be used to analyze and improve tiltrotor aerodynamic performance.

Subject Categories:

  • VSTOL
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE