Contamination and Distortion of Steady Flow Field Induced by Discrete Frequency Disturbances in Aircraft Gas Engines.

Abstract

The main objective of this program was to acquire fundamental understanding of two aerodynamic effects induced by vortices shed by blades of aircraft gas turbines: a) the instantaneous separation of total temperature and pressure around vortices in the wake shed and its time averaged effect; and b) the issue of over 100% efficiency measured near the hub section of an advanced turbofan design of the Air Force Aeropropulsion Laboratory. Through the combination of experimental and theoretical investigations, the mechanisms of the two phenomena have been identified. Keywords: Vortex shedding; Turbofan engines; Unsteady flow; Negative entrophy.

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1988
Accession Number
ADA195440

Entities

People

  • M. Kurosaka

Organizations

  • University of Tennessee Space Institute

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Air Force
  • Energy
  • Engines
  • Flow Fields
  • Fluid Dynamics
  • Fluid Mechanics
  • Frequency
  • Gas Turbines
  • Heat Energy
  • Heat Transfer
  • Mechanics
  • Physics Laboratories
  • Standing Waves
  • Steady Flow
  • Turbines
  • Turbofan Engines
  • Vortex Shedding

Fields of Study

  • Physics

Readers

  • Combustion and Flow Dynamics.
  • Fluid Mechanics and Fluid Dynamics.