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RISModeling the Transport of Fuel Mixture Perturbations and Entropy Waves in the Linearized Framework
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: In this paper, a new method is introduced to model the transport of entropy waves and equivalence ratio fluctuations in turbulent flows. The model is based on the Navier–Stokes equations and includes a transport equation ...
Advanced Identification of Coherent Structures in Swirl-Stabilized Combustors
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: We present an application of a newly introduced method to analyze the time-resolved experimental data from the flow field of a swirl-stabilized combustor. This method is based on the classic proper orthogonal decomposition ...
Stability and Sensitivity Analysis of Hydrodynamic Instabilities in Industrial Swirled Injection Systems
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The hydrodynamic instability in an industrial, two-staged, counter-rotative, swirled injector of highly complex geometry is under investigation. Large eddy simulations (LES) show that the complicated and strongly nonparallel ...
Guiding Actuator Designs for Active Flow Control of the Precessing Vortex Core by Adjoint Linear Stability Analysis
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The fundamental impact of the precessing vortex core (PVC) as a dominant coherent flow structure in the flow field of swirl-stabilized gas turbine combustors has still not been investigated in depth. In order to do so, the ...
Examining the Effect of Geometry Changes in Industrial Fuel Injection Systems on Hydrodynamic Structures With BiGlobal Linear Stability Analysis
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Shape optimization with respect to the suppression or enhancement of dynamical flow structures is an important topic in combustion research and beyond. In this paper, we investigate the flow in an industrial fuel injection ...
Impact of Shear Flow Instabilities on the Magnitude and Saturation of the Flame Response
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Amplitudedependent flame transfer functions, also denoted as flame describing functions, are valuable tools for the prediction of limitcycle amplitudes of thermoacoustic instabilities. However, the effects that govern the ...
Why Nonuniform Density Suppresses the Precessing Vortex Core
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Linear stability analysis is applied to a swirlstabilized combustor flow with the aim to understand how the flame shape and associated density field affects the manifestation of selfexcited flow instabilities. In isothermal ...
Methods for the Extraction and Analysis of the Global Mode in Swirling Jets Undergoing Vortex Breakdown
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Swirling jets undergoing vortex breakdown are widely used in combustion applications, due to their ability to provide aerodynamic flame stabilization. It is well known that vortex breakdown is accompanied by a dominant ...
Characterization of Different Actuator Designs for the Control of the Precessing Vortex Core in a Swirl-Stabilized Combustor
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The precessing vortex core (PVC) represents a helical-shaped coherent flow structure typically occurring in both reacting and nonreacting swirling flows. Until now, the fundamental impact of the PVC on flame dynamics, ...
Experimental Study of Transient Mechanisms of Bistable Flame Shape Transitions in a Swirl Combustor
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Sudden changes of flame shape are an undesired, yet poorly understood feature of swirl combustors used in gas turbines. The present work studies flame shape transition mechanisms of a bistable turbulent swirl flame in a ...