Accession Number:

AD0735205

Title:

Theoretical Investigation of Oscillatory Blade Row Aerodynamics under Unstalled Conditions,

Descriptive Note:

Corporate Author:

FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s):

• Stern,J.

Report Date:

1971-10-28

Pagination or Media Count:

36.0

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