Accession Number:

AD0667384

Title:

THEORETICAL AND EXPERIMENTAL INVESTIGATION OF THE INSTANTANEOUS INDUCED VELOCITY FIELD IN THE WAKE OF A LIFTING ROTOR

Descriptive Note:

Technical rept.

Corporate Author:

DYNASCIENCES CORP BLUE BELL PA

Report Date:

1968-01-01

Pagination or Media Count:

174.0

Abstract:

Measurements have been made of the instantaneous and time-averaged values of the induced velocities in the wake of a full-scale helicopter in actual steady flight conditions. These measurements were made with three- dimensional pitot static and two-dimensional hot film probes. The test setup provided for measurements at several radial, axial, and azimuthal positions relative to the rotor centerline. Simple, analytical methods are formulated to predict the instantaneous and time-averaged, induced velocities in the rotor wake. Calculated values of the induced velocities are compared with the experimental data, and agreement is obtained for the hovering flight condition.

Subject Categories:

  • Helicopters
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE