Near-Stall Loss Measurements in a CD Compressor Cascade with Exploratory Leading Edge Flow Control

Abstract

Loss measurements were conducted using a five-hole conical pneumatic probe in a subsonic wind tunnel containing a modeled cascade of controlled diffusion (CD) stator blades. Following reference measurements at high incidence one blade was modified (slotted at the leading edge) in an attempt to (passively) reduce the size of the leading edge separation bubble and thereby improve performance. Prior to the surveys, the acquisition and reduction software was modified to provide loss calculations using both mass-averaged and fully-mixed-out conditions for the upstream and downstream flows. Results showed that the mass-averaged method provided the more consistent results, and this was explained. The slotted leading edge blade was found to produce less loss than the reference blade, and it was concluded that the control concept should be explored in more detail.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1990
Accession Number
ADA237497

Entities

People

  • Jeffrey H. Armstrong

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Materials and Manufacturing Processes
  • Sensors

DTIC Thesaurus Topics

  • Boundary Layer
  • Computational Fluid Dynamics
  • Data Acquisition
  • Data Reduction
  • Downstream Flow
  • Flow Fields
  • Flow Visualization
  • Fluid Dynamics
  • Leading Edges
  • Measurement
  • Pressure Distribution
  • Pressure Measurement
  • Reynolds Number
  • Test Facilities
  • Three Dimensional
  • Two Dimensional
  • Wind Tunnels

Fields of Study

  • Physics

Readers

  • Aerodynamics.
  • Fluid Mechanics and Fluid Dynamics.