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RISAeroelastic Instability in Transonic Fans
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: This paper describes stall flutter, which can occur at part speed operating conditions near the stall boundary. Although it is called stall flutter, this phenomenon does not require the stalling of the fan blade in the ...
On the Importance of Engine-Representative Models for Fan Flutter Predictions
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Discrepancies between rig tests and numerical predictions of the flutter boundary for fan blades are usually attributed to the deficiency of computational fluid dynamics (CFD) models for resolving flow at off-design ...
A Parametric Study of the Effects of Inlet Distortion on Fan Aerodynamic Stability
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The performance and aerodynamic stability of fan blades operating in a circumferentially nonuniform inlet flow is a key concern in the design of turbofan engines. With the recent trends in the design of civil engines with ...
Improving the Flutter Margin of an Unstable Fan Blade
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The aim of this paper is to introduce design modifications that can be made to improve the flutter stability of a fan blade. A rig fan blade, which suffered flutter in the part-speed range and for which good quality measured ...
Transonic Fan Blade Redesign Approach to Attenuate Nonsynchronous Vibration
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Due to manufacturing tolerance and deterioration during operation, different blades in a fan assembly exhibit geometric variability. This leads to asymmetry which will be amplified in the running geometry by centrifugal ...
Impact of Exit Duct Dynamic Response on Compressor Stability
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Abrupt distortions can appear as a result of transient crosswind or during rapid aircraft maneuvers. Such distortions are known to reduce the aerodynamic stability of engines and therefore present a major concern to all ...
A Method of Stall and Surge Prediction in Axial Compressors Based on Three-Dimensional Body-Force Model
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The occurrence of stall and surge in axial compressors has a great impact on the performance and reliability of aero-engines. Accurate and efficient prediction of the key features during these events has long been the focus ...
Stall and Recovery Process of a Transonic Fan With and Without Inlet Distortion
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The aim of this research is to study the stall and recovery behavior of a transonic fan stage with and without inlet distortion. For this purpose, simulations of the stall and recovery process of NASA stage 67 are performed ...
Deficiencies in the Spalart–Allmaras Turbulence Model for the Prediction of the Stability Boundary in Highly Loaded Compressors
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Reynolds-averaged Navier–Stokes (RANS) equations are employed for aerodynamic and aeroelastic modeling in axial compressors. Their solutions are highly dependent on the turbulence models for closure. The main objective of ...
Influence of Intake on Fan Blade Flutter
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The main aim of this paper is to study the influence of upstream reflections on flutter of a fan blade. To achieve this goal, flutter analysis of a complete fan assembly with an intake duct and the downstream outlet guide ...