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RISThe Impact of Blade Loading and Unsteady Pressure Bifurcations on Low Pressure Turbine Flutter Boundaries
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The three major aeroelastic issues in the turbomachinery blades of jet engines and power turbines are forced response, nonsynchronous vibrations, and flutter. Flutter primarily affects highaspect ratio blades found in the ...
Physical Understanding and Sensitivities of Low Pressure Turbine Flutter
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Successful, efficient turbine design requires a thorough understanding of the underlying physical phenomena. This paper investigates the flutter phenomenon of low pressure turbine (LPT) blades seen in aircraft engines and ...
A Fluid–Structure Interaction Tool Using a Van der Pol-Based Reduced-Order Model for Buffet and Nonsynchronous Vibrations
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: This paper builds upon a two-degree-of-freedom Van der Pol oscillator-based reduced-order model for studying the mechanisms around nonsynchronous vibrations (NSV) in turbomachinery. One degree tracks the fluid motion ...
Quasi-Dynamic Approximation of Unsteady Pressure Distribution for Transonic Airfoils in Flutter
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: A lack of reliable experimental data on transonic blade flutter in real turbomachines hampers the further improvement of computational design predictions for off-design operation regimes of newly-built machines. Acquiring ...
Forced Response Sensitivity of a Mistuned Rotor From an Embedded Compressor Stage
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The frequency mistuning that occurs due to manufacturing variations and wear and tear of the blades has been shown to significantly affect the flutter and forced response behavior of a blade row. While tuned computational ...
Mistuned Higher-Order Mode Forced Response of an Embedded Compressor Rotor—Part II: Mistuned Forced Response Prediction
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: This paper is the second part of a two-part paper that presents a comprehensive study of the higher-order mode (HOM) mistuned forced response of an embedded rotor blisk in a multistage axial research compressor. The resonant ...
Numerical Investigation of Classic Flutter Mechanism Under Circumferentially Non-Uniform Inlet Condition
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Over recent years, the aeroelastic problem of fan blades has become significantly serious due to the demand for high performance of aero-engines. To explore the aeroelastic issue of flutter, fan instability is represented ...
Mistuned Forced Response Predictions of an Embedded Rotor in a Multistage Compressor
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: This paper covers a comprehensive forced response analysis conducted on a multistage compressor and compared with the largest forced response experimental data set ever obtained in the field. The steadystate aerodynamic ...
Vortex Induced Vibration and Frequency Lock In of an Airfoil at High Angles of Attack
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Vortexinduced vibration is a fluid instability where vortices due to secondary flows exert a periodic unsteady force on the elastic structure. Under certain circumstances, the shedding frequency can lock into the structure ...
Developing a Reduced Order Model of Nonsynchronous Vibration in Turbomachinery Using Proper Orthogonal Decomposition Methods
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The paper develops a reducedorder model of nonsynchronous vibration (NSV) using proper orthogonal decomposition (POD) methods. The approach was successfully developed and implemented, requiring between two and six POD modes ...