Hydrogen Enriched   Confined Methane Flame  Behavior and Flashback Modeling

Tunçer, Onur; Acharya, Sumanta; Uhm, Jong Ho

doi:10.2514/6.2006-754

Cited by 6 publications

(4 citation statements)

References 11 publications

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“…This difference in failure mechanism is primarily attributed to the difference in the microstructure of the TBC as the EB-PVD is more strain compliant. APS coatings are porous due to processing with a relatively non-uniform distribution of micro-cracks that weaken its fracture toughness (≈0.5 MPa√m) [34]. EB-PVD coatings consist of loosely interconnected columnar grains, usually oriented normal to the coating/substrate interface.…”

Section: High Temperature Interfacial Growth Kinetcs and Tgo Studiesmentioning

confidence: 99%

A Study of Advanced Materials for Gas Turbine Coatings at Elevated Temperatures Using Selected Microstructures and Characteristic Environments for Syngas Combustion

Diwan¹,

Mensah²,

Li³

et al. 2011

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Thermal barrier coatings (TBCs) that can be suitable for use in industrial gas turbine engines have been processed and compared with electron beam physical vapor deposition (EBPVD) microstructures for applications in advanced gas turbines that use coal-derived synthesis gas. Thermo-physical properties have been evaluated of the processed air plasma sprayed TBCs with standard APS-STD and vertically cracked APS-VC coatings samples up to 1300 o C. Porosity of these selected coatings with related microstructural effects have been analyzed in this study. Wet and dry thermal cycling studies at 1125 o C and spalling resistance thermal cycling studies to 1200 o C have also been carried out. Type I and Type II hot corrosion tests were carried out to investigate the effects of microstructure variations and additions of alumina in YSZ top coats in multi-layered TBC structures. The thermal modeling of turbine blade has also been carried out that gives the capability to predict in-service performance temperature gradients. In addition to isothermal high temperature oxidation kinetics analysis in YSZ thermal barrier coatings of NiCoCrAlY bond coats with 0.25% Hf. This can affect the failure behavior depending on the control of the thermally grown oxide (TGO) growth at the interface. The TGO growth kinetics is seen to be parabolic and the activation energies correspond to interfacial growth kinetics that is controlled by the diffusion of O 2 in Al 2 O 3 . The difference between oxidation behavior of the VC and STD structures are attributed to the effects of microstructure morphology and porosity on oxygen ingression into the zirconia and TGO layers. The isothermal oxidation resistance of the STD and VC microstructures is similar at temperatures up to 1200 o C. However, the generally thicker TGO layer thicknesses and the slightly faster oxidation rates in the VC microstructures are attributed to the increased ingression of oxygen through the grain boundaries of the vertically cracked microstructures. The plasma sprayed TBC microstructure (VC and STD) with NiCoCrAlY-Hf bond coat are stable up to 1100 o C. However, as with other TBC structures, a considerable amount of interdiffusion was observed in the different layers, although the TBC growth was self-limiting and parabolic. The addition of Hf to the VC microstructure appears to have some potential for the future development of robust TBCs with improved isothermal and service temperatures in advanced gas turbines.

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Section: High Temperature Interfacial Growth Kinetcs and Tgo Studiesmentioning

confidence: 99%

A Study of Advanced Materials for Gas Turbine Coatings at Elevated Temperatures Using Selected Microstructures and Characteristic Environments for Syngas Combustion

Diwan¹,

Mensah²,

Li³

et al. 2011

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“…As the cycle progresses and the total fluid velocity attains a positive value that exceeds the flame speed (which always points towards the reactants side flame front) recovers its shape and re-attaches to the center body tip. For a more elaborate discussion of this phenomenon (including a theoretical background) please refer to [11,12]…”

Section: Emissions Measurementsmentioning

confidence: 99%

“…The basic design of the fuel-air premixing section represents a generic configuration with characteristic features similar to industrial gas turbine systems. More detailed discussion about the design of this specific combustor can be found in [11,12]. Combustor exit is only restricted not fully choked.…”

Section: Introductionmentioning

confidence: 99%

Dynamics, NOx and Flashback Characteristics of Confined Pre-Mixed Hydrogen Enriched Methane Flames

Tunçer

Acharya

Uhm

2007

Volume 2: Turbo Expo 2007

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The operating regime of a gas turbine combustor is highly sensitive to fuel composition changes. In particular, the addition of hydrogen, a major constituent of syngas, has a major effect on flame behavior due to the higher burning rates associated with hydrogen. A laboratory scale pre-mixed test rig is constructed in order to study such effects. The fuel composition is incremented with increasing hydrogen starting from 100% methane. It is observed that increased RMS pressure levels and higher susceptibility to flashback occurs with increasing hydrogen volume fraction. Furthermore, hydrogen enrichment can cause an abrupt change in the dominant acoustic mode. Phase locked hydroxyl PLIF measurements have been performed with respect to the dominant acoustic instability limit cycle. These measurements are complemented with real time heat release, emissions and flashback measurements. Particular emphasis is put on time resolving the thermoacoustic instability induced flashback cycle of the wedgeshaped flame front and the temporal events associated with flashback.

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“…Koch et al analyzed the effects of hydrogen enrichment on the methane internal combustion engine using Reynolds-averaged Navier-Stokes equation (RANS) and large eddy simulation (LES) with Gequation based turbulent flame speed modeling [32,33]. Tuncer et al showed that thermo-acoustic instability-induced flame flashback of hydrogen-enriched methane flames, which contain hydrogen fractions up to 50 %, could be captured using the Gequation, and its results showed good agreement with experiments [34].…”

Section: Introductionmentioning

confidence: 99%

Ensemble-averaged kinematics of harmonically oscillating turbulent premixed flames

Kim

Aspden

et al. 2023

Combustion and Flame

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Hydrogen Enriched Confined Methane Flame Behavior and Flashback Modeling

Cited by 6 publications

References 11 publications

A Study of Advanced Materials for Gas Turbine Coatings at Elevated Temperatures Using Selected Microstructures and Characteristic Environments for Syngas Combustion

A Study of Advanced Materials for Gas Turbine Coatings at Elevated Temperatures Using Selected Microstructures and Characteristic Environments for Syngas Combustion

Dynamics, NOx and Flashback Characteristics of Confined Pre-Mixed Hydrogen Enriched Methane Flames

Ensemble-averaged kinematics of harmonically oscillating turbulent premixed flames

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