Vorticity Measurements Using Calibrated Vane-Vorticity Indicators and Comparison with X-Wire Data,

Abstract

Vane-type vorticity indicators of various sizes have been constructed, calibrated and used for direct and rapid measurement of local mean streamwise vorticity in several swirling flows. The dependence of their calibration factor, which relates the vane rotational speed to the local angular velocity of the fluid, on the free-stream velocity, the fluid rotational speed, and the transverse vorticity gradient was determined. When the vanes were carefully calibrated, and regularly checked and maintained, good agreement was achieved between vorticity profiles obtained using them and X-wire data. Otherwise, a vane can only be used to give an indication of vorticity. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1977
Accession Number
ADA048451

Entities

People

  • H. M. Nagib
  • Mahmoud Ahmed
  • R. A. Wigeland

Organizations

  • Illinois Institute of Technology

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Agreements
  • Autocorrelation
  • Bearings
  • Bodies
  • Calibration
  • Eddies (Fluid Mechanics)
  • Flow
  • Free Stream
  • Friction
  • Jewel Bearings
  • Measurement
  • Photographs
  • Secondary Flow
  • Signal Processing
  • Solid Bodies
  • Trailing Vortices
  • Vortices

Readers

  • Aerospace Test and Evaluation
  • Combustion and Flow Dynamics.
  • Fluid Mechanics and Fluid Dynamics.