A review of oscillation mechanisms and the role of the precessing vortex core (PVC) in swirl combustion systems

https://hal.archives-ouvertes.fr/hal-00803230/document

Large Eddy Simulations of gaseous flames in gas turbine combustion chambers

The combined dynamics of swirler and turbulent premixed swirling flames

Lean premixed prevaporized (LPP) combustion is a widely used concept for reducing pollutant emissions ingas turbines. In LPP systems, a mixing tube is added between the injector and the combustion chamber to promote mixing and combustion eff

Large eddy simulation and experimental study of flashback and blow-off in a lean partially premixed swirled burner

Flow–flame interactions causing acoustically coupled heat release fluctuations in a thermo-acoustically unstable gas turbine model combustor

Comparative study of turbulent mixing in jet in cross-flow configurations using LES

The method of large eddy simulation (LES) has a high potential to accurately predict complex turbulent flows. Gas turbine combustion systems feature a number of phenomena interacting with each other such as swirl with recirculation, complex turbulent mixing and combustion of premixed, non-premixed as well as partially premixed nature. We therefore tend to approach the simulation of real gas turbine combustors step by step. The aim of this paper is to document some of the progress made at EKT in assessing the capability of LES in flows separately exhibiting distinct features of gas turbine combustors. Some results from two configurations are presented and discussed: a non-confined isothermal swirl flow with precessing vortex core and a non-premixed bluff-body flame.

Large eddy simulation of combustion processes under gas turbine conditions

While the basic capability of large eddy simulation (LES) has been amply demonstrated on a number of relatively simple academic configurations, there is still a lack of works applying LES to practical systems also performing detailed quantitative comparisons based on experimental data. In this paper, we tend to approach the simulation of real gas turbine combustor step by step as we first present results of the isothermal LES of a generic gas turbine combustor rig. The available detailed measurements are used to thoroughly validate the LES results. Beyond a pure validation, the LES is used to analyze the influence of the precessing vortex core present in the studied configuration on the mixing of fuel and oxidizer, and possible implications for reacting conditions are discussed.

Study of Flow and Mixing in a Generic GT Combustor Using LES

In order to evaluate the direct and indirect contributions to the total combustion noise emission, a combustion chamber consisting of a swirl burner and an exit nozzle of Laval-shape, representing a gas turbine combustor, is investigated by means of experiments and large eddy simulation. Focused on the isothermal flow case first and encouraged by a good overall agreement between the LES and the experimental data for the flow field, a first characterisation of the flow with respect to noise sources is performed. To analyse acoustic properties of the flow, time and length scales are evaluated inside the combustor. Furthermore, the evidence for the existence of a precessing vortex core (PVC), typical for configurations with swirl, is revealed. Finally, the effect of the PVC on the flow inside the Laval nozzle is discussed.

Analysis of Unsteady Motion with Respect to Noise Sources in a Gas Turbine Combustor: Isothermal Flow Case

Evaluation of u-rans performance in predicting an unconfined swirling flow with precessing vortex core based on les and experiments

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