Accession Number : ADA195440

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

Descriptive Note : Final rept. Jan-Dec 87,

Corporate Author : TENNESSEE UNIV SPACE INST TULLAHOMA

Personal Author(s) : Kurosaka, M

PDF Url : ADA195440

Report Date : Apr 1988

Pagination or Media Count : 5

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.

Descriptors :   *VORTEX SHEDDING, *WAKE, *GAS TURBINE BLADES, AERODYNAMIC FORCES, AIRCRAFT ENGINES, CONTAMINATION, DISTORTION, FLOW FIELDS, FREQUENCY, GAS TURBINES, HUBS, LABORATORIES, SEPARATION, STEADY FLOW, THEORY, TURBOFAN ENGINES, UNSTEADY FLOW, VORTICES, EFFICIENCY, ENTROPY

Subject Categories : Fluid Mechanics
      Jet and Gas Turbine Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE