Part-Load Operation of a Piloted FLOX® Combustion System

Roediger, Tim; Lammel, Oliver; Aigner, Manfred; Beck, Christian; Krebs, Werner

doi:10.1115/gt2012-69006

Cited by 2 publications

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“…An important technology step change is the development of constant pressure sequential combustion systems, also known as axial staging concepts [11,18,21]. In these combustors, the first stage is based on lean premixed turbulent combustion, with swirled flames anchored on conventional burners.…”

Section: Introductionmentioning

confidence: 99%

Autoignition flame dynamics in sequential combustors

Schulz

Noiray

2018

Combustion and Flame

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This numerical study deals with the heat release rate response of a sequential combustor flame to temperature perturbations. These flames are found in the new generation of gas turbine combustors, which are based on sequential combustion technologies. It is shown that the temperature perturbations T upstream of the fuel injection induce mixture fraction oscillations Z which also propagate toward the reaction zone, and that the combination of these two perturbations yields a strongly nonlinear heat release rate response Q . Large Eddy Simulation (LES) were performed using an Analytically Reduced Chemistry (ARC) mechanism, which includes 22 transported species in combination with the Dynamic Thickened Flame model (DTF). The burner flame transfer function (BFTF) giving the flame response with respect to T is obtained using a broadbandexcitation-based system identification (SI) as well as harmonic single frequency excitations. A simplified configuration with perfectly premixed conditions is considered to quantify the respective contributions of the different types of perturbation. These simulations highlight (i) the strong nonlinearity of the flame response to temperature perturbations, and (ii) the difficulty to break down the global flame response into independent driving mechanisms by making use of "simplified" configurations.

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Section: Introductionmentioning

confidence: 99%

Autoignition flame dynamics in sequential combustors

Schulz

Noiray

2018

Combustion and Flame

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“…First feasibility studies of FLOX R burners for modern gas turbines demonstrated operation of single stage burners at high power densities and flame temperatures [9]. In the following development steps various piloted and staged burner configurations [10,11] were tested in order to increase the operational flexibility. The evolution of FLOX R burners for GT applications has been described more comprehensively in [1].…”

Section: Introductionmentioning

confidence: 99%

High-Momentum Jet Flames at Elevated Pressure, C: Statistical Distribution of Thermochemical States Obtained From Laser-Raman Measurements

Lammel

Lückerath

et al. 2020

Journal of Engineering for Gas Turbines and Power

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A detailed investigation on flame structures and stabilization mechanisms of confined high momentum jet flames by 1D-laser Raman measurements is presented. The flames were operated with natural gas (NG) at gas turbine relevant conditions in an optically accessible high pressure test rig. The generic burner represents a full scale single nozzle of a high temperature FLOX® gas turbine combustor including a pilot stage. 1D-laser Raman measurements were performed on both an unpiloted and a piloted flame and evaluated on a single shot basis revealing the thermochemical states from unburned inflow conditions to burned hot gas in terms of average and statistical values of the major species concentrations, the mixture fraction and the temperature. The results show a distinct difference in the flame stabilization mechanism between the unpiloted and the piloted case. The former is apparently driven by strong mixing of fresh unburned gas and recirculated hot burned gas that eventually causes autoignition. The piloted flame is stabilized by the pilot stage followed by turbulent flame propagation. The findings help to understand the underlying combustion mechanisms and to further develop gas turbine burners following the FLOX® concept. Together with the connected papers A, B and D, the results form a unique and comprehensive data set for the validation of numerical simulation models.

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Part-Load Operation of a Piloted FLOX® Combustion System

Cited by 2 publications

References 0 publications

Autoignition flame dynamics in sequential combustors

Autoignition flame dynamics in sequential combustors

High-Momentum Jet Flames at Elevated Pressure, C: Statistical Distribution of Thermochemical States Obtained From Laser-Raman Measurements

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