Accession Number : AD0735205

Title :   Theoretical Investigation of Oscillatory Blade Row Aerodynamics under Unstalled Conditions,

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Stern,J.

Report Date : 28 OCT 1971

Pagination or Media Count : 36

Abstract : In order to calculate the critical flutter-speed of compressor and turbine blade systems, it is necessary to carry out the numerical determination of the oscillatory aerodynamic forces and moments acting on a cascade of aerofoils. The object of this paper is to give a method for calculating these oscillatory lifts and moments for the case of an infinite, two-dimensional cascade at non-zero incidence. Arbitrary stagger and interblade phase-lag angles are permitted. The blades are supposed to be flat plates undergoing oscillatory motion consisting of flexural and torsional degrees of freedom. This paper presents a natural extension of the Whitehead method to the more general case, in which the aerodynamics of cascade blades under bending-torsion oscillation is treated. (Author)

Descriptors :   (*ROTOR BLADES(TURBOMACHINERY), OSCILLATION), TURBINE BLADES, COMPRESSOR BLADES, FLUTTER, STRESSES, VORTICES, NUMERICAL ANALYSIS, CZECHOSLOVAKIA

Subject Categories : Fluid Mechanics
      Jet and Gas Turbine Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE