Off-Design Loss Measurements in a Compressor Cascade

Abstract

Data acquisition software was written to recover the ability to make loss measurements using a five-hole pneumatic probe in a wind tunnel facility currently containing a modeled subsonic cascade of controlled diffusion (CD) stator blades. Acquisition, reduction and ancillary programs were written for a Hewlett Packard 9000 Series 300 computer/HP 3052 Data Acquisition System in HP BASIC 5.0. The new software was demonstrated and validated by conducting a set of surveys at the (near to stall) air inlet flow angle of 48 degrees. The survey results showed a diminishing core of two-dimensional flow through the blading due to side wall boundary layer effects, and integration of upstream and downstream measurements gave an axial velocity-density ratio of 1.108 and a NASA loss coefficient of 0.097. Prior to the surveys, the probe was calibrated in a free jet facility, thus also revalidating the calibration software. It was concluded that the facility instrumentation and procedures were now in place for making accurate off-design loss measurements on a routine basis.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1989
Accession Number
ADA220094

Entities

People

  • Michael A. Classick

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Cyber
  • Energy and Power Technologies
  • Sensors

DTIC Thesaurus Topics

  • Acquisition
  • Aeronautics
  • Barometric Pressure
  • Boundary Layer
  • Computer Programming
  • Computer Programs
  • Computers
  • Data Acquisition
  • Flow
  • Instrumentation
  • Measurement
  • Operating Systems
  • Pressure Distribution
  • Static Pressure
  • Test Facilities
  • Two Dimensional
  • Wind Tunnels

Fields of Study

  • Physics

Readers

  • Aerospace Engineering
  • Fluid Dynamics.
  • Fluid Mechanics and Fluid Dynamics.