Accession Number : ADA111935

Title :   Aerodynamics of Cascaded Airfoils Oscillating or Subject to Three-Dimensional Periodic Gusts.

Descriptive Note : Final rept. 1 Oct 78-31 Dec 80,

Corporate Author : NOTRE DAME UNIV IN DEPT OF AEROSPACE AND MECHANICAL ENGINEERING

Personal Author(s) : Atassi,H

PDF Url : ADA111935

Report Date : Jan 1980

Pagination or Media Count : 42

Abstract : Three problems which have been investigated are discussed in this report. Aerodynamic theory and computational procedures have been developed to study the aeroelastic stability of oscillating loaded airfoils in cascade with interblade phase angle. Contrary to linear theory, results show that classical flutter can occur for low speed turbine cascades operating at typical design conditions. Ground effects on fan inlet flows were investigated based on data from NASA - Lewis. The analysis showed that swirling flows are the dominant source of flow disturbances entering the fan. Finally, a study was made of three-dimensional periodic disturbances acting upon loaded airfoils in cascade. (Author)

Descriptors :   *CASCADE STRUCTURES, *BLADE AIRFOILS, *FLUTTER, TURBINE BLADES, COMPRESSOR BLADES, AEROELASTICITY, TURBOFAN ENGINES, PRESSURE DISTRIBUTION, AERODYNAMIC LOADING, OSCILLATION, UNSTEADY FLOW, THREE DIMENSIONAL FLOW, PERIODIC VARIATIONS, INTERFERENCE, GUIDE VANES, LOW VELOCITY, GUSTS, GROUND EFFECT, JET ENGINE INLETS, DISTORTION, VIBRATION, TURBOMACHINERY, STABILITY, PERTURBATIONS

Subject Categories : Fluid Mechanics
      Jet and Gas Turbine Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE