Fuel effects on lean blow-out in a realistic gas turbine combustor

Esclapez, Lucas; Peter, Christine; Mayhew, Eric; Xu, Rui; Stouffer, Scott D.; Lee, Tonghun; Wang, Shuangfeng; Ihme, Matthias

doi:10.1016/j.combustflame.2017.02.035

Cited by 160 publications

(39 citation statements)

References 42 publications

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“…The inner tube of the fuel stream is recessed from the jet exit plane by L r = 75 mm, with the bulk jet velocity is set to 57 m/s (Lr75-57 ), corresponding to 50% of the experimentally measured blow-off velocity. The recess results in a partially premixed reactant-gas mixture, which is relevant to modern gas turbine applications [46,47].…”

Section: Methodsmentioning

confidence: 99%

A general probabilistic approach for the quantitative assessment of LES combustion models

Johnson

Ihme

2017

Combustion and Flame

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The Wasserstein metric is introduced as a probabilistic method to enable quantitative evaluations of LES combustion models. The Wasserstein metric can directly be evaluated from scatter data or statistical results using probabilistic reconstruction against experimental data. The method is derived and generalized for turbulent reacting flows, and applied to validation tests involving the Sydney piloted jet flame. It is shown that the Wasserstein metric is an effective validation tool that extends to multiple scalar quantities, providing an objective and quantitative evaluation of model deficiencies and boundary conditions on the simulation accuracy. Several test cases are considered, beginning with a comparison of mixture-fraction results, and the subsequent extension to reactive scalars, including temperature and species mass fractions of CO and CO 2 . To demonstrate the versatility of the proposed method in application to multiple datasets, the Wasserstein metric is applied to a series of different simulations that were contributed to the TNF-workshop. Analysis of the results allowed to identify competing contributions to model deviations, arising from uncertainties in the boundary conditions and model deficiencies. These applications demonstrate that the Wasserstein metric constitutes an easily applicable mathematical tool that reduce multiscalar combustion data and large datasets into a scalar-valued quantitative measure.

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Section: Methodsmentioning

confidence: 99%

A general probabilistic approach for the quantitative assessment of LES combustion models

Johnson

Ihme

2017

Combustion and Flame

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“…In particular, the methane content in the fuel gas composition has a decisive influence on the energy characteristics of the gas turbine and on the performance of the installation as a whole. [13][14][15].…”

Section: Discussionmentioning

confidence: 99%

Research on the influence of fuel gas on energy characteristics of a gas turbine

2019

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The purpose of this paper is to study and analyze the gas turbine engine and the thermodynamic cycle of a gas turbine. The article describes the processes of influence of the working fluid composition on the parameters of the main energy gas turbines, depending on the composition of the fuel gas. The calculations of the thermal scheme of a gas turbine, which were made using mathematical modeling, are given. As a result of research on the operation of the GE PG1111 6FA gas turbine installation with various gas compositions, it was established that when the gas turbine is operating on different fuel gases, the engine efficiency changes. The gas turbine efficiency indicators were determined for various operating parameters and fuel composition. The impact of fuel components on the equipment operation is revealed.

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“…The prediction of such phenomena, that imply transients of the local flame structure, is one of the main challenges of current generation turbulent combustion models since the interaction between turbulence and chemistry has to be accurately captured to have reliable predictions. Although some success in predicting local extinctions has been shown with flamelet-based models [84,85], methods based on the online solution of the chemistry appear the most appropriate since it is possible to directly take into account the interaction between turbulence and flame structure, with the former directly affecting the transient evolution of the species. Furthermore, the presence of liquid sprays, as in typical gas turbines for aeronautical application, further increases the range of scales and physical processes involved in the combustion process [34] generally making the prediction of the flame behavior more challenging.…”

Section: Turbulent Combustion Modelsmentioning

confidence: 99%

“…At the same time, the flame moves closer to the injection location with evaporation strongly affecting also the local extinction behaviour. Recently, complete blow-off of a spray combustor has also been attempted with the progress variable-flamelet model [84] and reasonable prediction of the structure of the flame at the blow-off condition was made. In addition, the "Lean Blow-Out" (LBO, as global extinction is known in gas turbine combustion parlance) was simulated and the important role of evaporation in determining the [124,133].…”

Section: Examplesmentioning

confidence: 99%

“…[98] with permission extinction behavior was also highlighted in this study. Differences between experiments and simulations in terms of LBO limits indicated the necessity of further studies and model development to quantitatively predict the blow-off event [84]. The modelling of the spray, including boundary conditions and multi-component fuel properties, was identified as main source of uncertainty [84].…”

Section: Examplesmentioning

confidence: 99%

See 1 more Smart Citation

Turbulent Combustion Modelling and Experiments: Recent Trends and Developments

Giusti

Mastorakos

2019

Flow Turbulence Combust

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The development of better laser-based experimental methods and the fast rise in computer power has created an unprecedented shift in turbulent combustion research. The range of species and quantities measured and the advent of kHz-level planar diagnostics are now providing great insights in important phenomena and applications such as local and global extinction, pollutants, and spray combustion that were hitherto unavailable. In simulations, the shift to LES allows better representation of the turbulent flow in complex geometries, but despite the fact that the grid size is smaller than in RANS, the push towards realistic conditions and the need to include more detailed chemistry that includes very fast species and thin reaction zones emphasize the necessity of a sub-grid turbulent combustion model. The paper discusses examples from current research with experiments and modelling that focus on flame transients (self-excited oscillations, local extinction), sprays, soot emissions, and on practical applications. These demonstrate how current models are being validated by experimental data and the concerted efforts the community is taking to promote the modelling tools to industry. In addition, the various coordinated International Workshops on non-premixed, premixed, and spray flames, and on soot are discussed and some of their target flames are explored. These comprise flames that are relatively simple to describe from a fluid mechanics perspective but contain difficult-to-model combustion problems such as extinction, pollutants and multi-mode reaction zones. Recently, swirl spray flames, which are more representative of industrial devices, have been added to the target flames. Typically, good agreement is found with LES and some combustion models such as the progress variable-mixture fraction flamelet model, the Conditional Moment Closure, and the Transported PDF method, but predicting soot emissions and the condition of complete extinction in complex geometries is still elusive.

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Fuel effects on lean blow-out in a realistic gas turbine combustor

Cited by 160 publications

References 42 publications

A general probabilistic approach for the quantitative assessment of LES combustion models

A general probabilistic approach for the quantitative assessment of LES combustion models

Research on the influence of fuel gas on energy characteristics of a gas turbine

Turbulent Combustion Modelling and Experiments: Recent Trends and Developments

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