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)
Aerodynamics of Cascaded Airfoils Oscillating or Subject to Three-Dimensional Periodic Gusts
1980
42 pages
Report
No indication
English
Jet & Gas Turbine Engines , 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 , Swirling flow , Unsteady aerodynamics , Aeroelastic stability
Unsteady Aerodynamics of Airfoils Encountering Traveling Gusts and Vortices
Online Contents | 1997
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