Hotwire Measurements of the Turbulent Flow Into a Cascade of Controlled- Diffusion Compressor Blades

Abstract

Turbulence measurements near the leading edge of a compressor stator were made in a subsonic cascade wind tunnel with a hotwire system. Using a single hot-film probe, velocity and turbulence distortion data were obtained about the leading edge of the Controlled-Diffusion (CD) blades in order to verify Laser Doppler Velocimetry (LDV) data taken in earlier studies. Measurements were conducted at a Mach number of .25, a Reynolds number of 711000 and an inlet flow angle of 48 degrees. Turbulence profiles obtained in the pitch-wise direction were found to be in good agreement with previous LDV measurements. These data indicated a localized increase in turbulence around the leading edge due to the interaction of the free-shear layer with the inlet turbulence. This free-shear layer extends over the separation bubble, which forms on the suction side of the blades' leading edge. Turbulence, Separation bubble, Hotwire, Free-shear layer, Cascade, Controlled-diffusion.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1993
Accession Number
ADA277297

Entities

People

  • Bryce E. Wakefield

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Materials and Manufacturing Processes
  • Sensors

DTIC Thesaurus Topics

  • Acquisition
  • Boundary Layer
  • Data Acquisition
  • Flow Fields
  • Fluid Dynamics
  • Measurement
  • Pressure Distribution
  • Pressure Measurement
  • Right Angles
  • Static Pressure
  • Statistical Analysis
  • Test Equipment
  • Test Facilities
  • Turbulent Flow
  • Turbulent Mixing
  • United States
  • Wind Tunnels

Fields of Study

  • Physics

Readers

  • Aerodynamics.
  • Fluid Dynamics.

Technology Areas

  • Directed Energy
  • Directed Energy - Lasers