Chemical Kinetic and Thermodynamics of Flameless Combustion Methodology for Gas Turbine Combustors

Levy, Y.; Rao, G. Arvind; Sherbaum, V.

doi:10.2514/6.2007-5629

Cited by 5 publications

(7 citation statements)

References 9 publications

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“…When done correctly, with the different mass flows in correct proportions and inlets at the right locations, flameless combustion can be established. Although not always operating in the exact same way, multiple research setups are present around the world [37,38].…”

Section: Flox®mentioning

confidence: 99%

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An Experimental and Numerical Investigation of the Aerodynamic Characteristics of a Flameless Combustor

Huijts

Perpignan

Rao

2019

Volume 4A: Combustion, Fuels, and Emissions

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The flameless combustion (FC) regime is a promising technology for gas turbines, as it potentially yields lower NOx emissions while maintaining high combustion efficiencies. However, the application of FC to gas turbines is still challenging as required conditions for its occurrence depend on several factors such as reactants mixing, residence times, heat losses, and chemical time-scales. Since the mixing of the reactants and incoming fresh air-fuel mixture plays an important role in FC, the aerodynamic characteristics of the combustor are instrumental in determining the combustor emission performance. Focusing on the aerodynamic characteristics, this paper is dedicated to the visualization and description of the flow inside a jet-based combustor designed to operate under FC. The cylindrical combustor has a FLOX® burner head with 12 concentrically placed nozzles, while an acrylic cylinder allowed full optical access to the flow field. The investigation was performed for non-reactive flow. Using Particle Image Velocimetry and a Reynolds-averaged Navier-Stokes CFD analysis, the flow was visualized and modelled. The simulations were run with the Standard and Realizable k-ε (SKE and RKE, respectively), as well as a Reynolds Stress turbulence model. The effect of modifying the SKE model C1ε constant was also investigated. In the experimental campaign, the influence of combustion chamber length, nozzle diameter, and jet velocity were investigated with respect to flow structure, recirculation ratios and entrainment behavior. The results show that the flow structure is mainly dependent on nozzle diameters, while the jet momentum is the correct parameter to assess the recirculation impact of a certain jet flow. The numerical investigation shows that the turbulence intensity at the boundaries is an important parameter to accurately simulate the jet spreading. None of the used turbulence models fully represented the flow field. Nonetheless, the SKE model with model C1ε = 1.44 was the best at representing the jets penetration and vortex core positions, and the recirculation ratio values predicted by it were in good agreement.

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Section: Flox®mentioning

confidence: 99%

“…Next to experimental setups computer models are also intensively used to try describing the working ways of flameless combustion and test the influence of the different variables [10,11]. Many others write about doing both [9,12,26,30,32,37,38,42,43,45,47,49].…”

Section: Costairmentioning

confidence: 99%

An Experimental and Numerical Investigation of the Aerodynamic Characteristics of a Flameless Combustor

Huijts

Perpignan

Rao

2019

Volume 4A: Combustion, Fuels, and Emissions

View full text Add to dashboard Cite

show abstract

“…Levy Y. etc. had researched on th ode in the gas turbine chamber and indicate that MILD combustion mode may be built as Kv is larger than 3.0 [10]. Figure 3 showed that when Rein ≥ 1.13 × 105, at the flame lift-off location x = 0.132m, its local Kv is 1.365, 1.191 and 1.182 respectively, are both larger than 0.3~0.5 of ordinary stable combustion mode such as bluff body combustion.…”

Section: ) Mild Combustion Temperature Fieldmentioning

confidence: 99%

“…For the current period, all kinds of fuel can be used for MILD combustion based on the air jet of normal temperature [4][5][6]. The application scope of MILD combustion is expanded from various industrial furnaces to high-tech field includes gas turbine and aeroengine [7][8][9][10][11]. Great differences of operating condition between industrial furnace and gas turbine lead to grand technical challenge [10].…”

Section: Introductionmentioning

confidence: 99%

“…The application scope of MILD combustion is expanded from various industrial furnaces to high-tech field includes gas turbine and aeroengine [7][8][9][10][11]. Great differences of operating condition between industrial furnace and gas turbine lead to grand technical challenge [10]. Nowadays, this research is on a stage of rapid development including mechanism analysis, experiment and numerical simulation.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Re Influence on MILD Combustion of Gas Turbine

Wang¹,

Qi²,

Sui³

et al. 2013

EPE

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The paper numerical studied the MILD(Moderate or Intense Low-oxygen Dilution) combustion mode and performances in the designed gas turbine chamber. The influence of air jet Re number on flue gas recycles ratio Kv and hereby on kerosene fuel MILD combustion were modeled. For fixed equivalence ratio, increasing the air jet Re number to the Kv value of 3.3 -3.8, MILD combustion mode will be formed. It has MILD combustion performances of volume combustion, excellent outlet temperature field and very low pollutant emissions. Combustor confinement has little effects on MILD combustion. Calculating results agree with other's similar experimental data.

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Flameless combustion with liquid fuel: A review focusing on fundamentals and gas turbine application

et al. 2017

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Chemical Kinetic and Thermodynamics of Flameless Combustion Methodology for Gas Turbine Combustors

Cited by 5 publications

References 9 publications

An Experimental and Numerical Investigation of the Aerodynamic Characteristics of a Flameless Combustor

An Experimental and Numerical Investigation of the Aerodynamic Characteristics of a Flameless Combustor

Analysis of Re Influence on MILD Combustion of Gas Turbine

Flameless combustion with liquid fuel: A review focusing on fundamentals and gas turbine application

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