Combustion and emission modelling near lean blow-out in a gas turbine engine

Eggenspieler, Gilles; Menon, Suresh

doi:10.1504/pcfd.2005.007062

Cited by 27 publications

(18 citation statements)

References 24 publications

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“…Menon et al [16][17][18] from Georgia Institute of Technology applied LES to study the LBO of the swirl stabilized premixed flame and the bluff body stabilized premixed flame. Their results showed that LES could capture the detailed flow field including the flame stretching and its effect on flame propagation near the LBO.…”

Section: Numerical Prediction Methodsmentioning

confidence: 99%

On the Quick Prediction of Lean Blowout Limits for Gas Turbine Combustors

Huang¹,

Sun²

2018

dteees

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The lean blowout (LBO) limit plays a critical role in the operation of gas turbine combustors. In order to achieve the quick prediction of the LBO limit, three major prediction tools for the LBO limit, i.e. the semi-empirical correlation, the numerical prediction method and the hybrid prediction method are proposed. The semi-empirical correlations are mainly based on the characteristic time (CT) model and the perfect stirred reactor (PSR) model. The semi-empirical correlations based on the PSR model are widely applied. Among these correlations, Lefebvre's LBO model that had been validated on 8 different aero gas turbine combustors with the uncertainty ±30% is the most successful. Later, many researchers did further studies to improve Lefebvre's LBO model. The numerical prediction methods are reported increasingly with the rapid development of the computing power. Up to now, some researchers validated the numerical prediction methods in 2 different combustor configurations with the prediction uncertainties about ±25%. More studies are required to validate the effects of the combustor configurations and the atomization performances on the LBO limit. The hybrid prediction methods try to combine the semi-empirical correlations with the numerical methods and are widely attempted in recent years. Many researchers have studied the numerical based hybrid method, which needs more validations and general criterions for different configurations and operating conditions. Other researchers have studied the semi-empirical based hybrid method, which has shown good agreement for 11 different combustor configurations with the prediction uncertainties about ±16%. Further improvements are required for all prediction tools to achieve more general and accurate predictions for the LBO limits of gas turbine combustors.

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Section: Numerical Prediction Methodsmentioning

confidence: 99%

On the Quick Prediction of Lean Blowout Limits for Gas Turbine Combustors

Huang¹,

Sun²

2018

dteees

View full text Add to dashboard Cite

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“…The closure of the subgrid stresses in the momentum equation and the subgrid heat flux in the energy equation are achieved using an eddy viscosity model [24]. The eddy viscosity model used here is based on the solution of a transport equation for the subgrid kinetic energy, k sgs that has been used extensively for both non-reacting and reacting flows [25][26][27]. The model coefficients are obtained using the localized dynamic K -equation (LDKM) approach as part of the solution [24].…”

Section: Mathematical Formulationmentioning

confidence: 99%

Large eddy simulation of soot formation in a turbulent non-premixed jet flame

El-Asrag

Menon

2009

Combustion and Flame

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“…The homogenization method that will be employed is based on a multi-scales expansion technique, [14], by which all dependent variables are asymptotically expanded using a small parameter, ε > 0. To make this asymptotic expansion consistent with (3) we require that the symmetries of (3) must be preserved, [39], and particularly the scaling symmetry.…”

Section: Les By Homogenization By Multi-scale Expansion Techniquesmentioning

confidence: 99%

“…Concerning the reaction modeling, the situation is even more pressing, and some models employ a simplified set of equations (typically a mixture fraction and a progress variable) to describe the progress of reaction, [5], together with very intricate modeling, [10,11], that result in models that are difficult to use when analyzing practical combustion devices, whereas other models rely on crude assumptions for the modeling of the filtered reaction rates, [12,13]. The present approach, departs noticeably from the conventional lowpass filtered LES, but has similarities with LEM-LES, [8,14], and other recently suggested multi-scale methods, [15,16]. In this approach, we use a multi-scales expansion technique to decompose the reactive Navier-Stokes Equations (NSE) into a cascade of equations for different scales, thereby representing the large-and small scales, respectively.…”

Section: Introductionmentioning

confidence: 99%

Homogenization Based LES for Turbulent Combustion

Fureby

2009

Flow Turbulence Combust

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In this work we propose a novel methodology for performing Large Eddy Simulations (LES) of premixed, non-premixed and partially premixed laminar and turbulent flames. The motivation behind this study is the need for more accurate and flexible LES computations of increasingly complex engineering applications, for which current LES models are limited. The main drawback of present LES methods for reactive flows is that most of the chemical activity, and thus also most of the exothermicity, occurs on the subgrid scales, and is hence subject to modeling using only information about the resolved scale flow. Reasonable results have been achieved in several studies with present LES models but improved accuracy, flexibility and reliability is needed. Here, we use a homogenization-based approach based on a multi-scale expansion technique to convert the reactive Navier-Stokes equations, with finite rate chemistry, into a cascade of equations for different scales. The equations of motion for the large-scale dependent variable dynamics are explicitly simulated, whereas the equations of motion for the small-scale dependent variable dynamics are simplified by reducing the spatial dimensions from three to one, thus permitting affordable simulations in a grid within the grid approach. Presently, the methodology is limited to low Ma number variable density flows, but can be extended to high Ma number reactive flows. This method has some similarities with the LES-LEM and the TLS models of Menon et al., but differs in some important aspects. The model developed is here applied to a bluff-body stabilized flame and comparisons with both experimental data and conventional flamelet and finite rate chemistry LES Track: SI DNS and LES of Reactive Flows. C. Fureby (B)Flow Turbulence Combust (2010) 84:459-480 models are made. The results show that the performance of this model is as good or better than any of the other models, and to a reasonable computational cost.

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Combustion and emission modelling near lean blow-out in a gas turbine engine

Cited by 27 publications

References 24 publications

On the Quick Prediction of Lean Blowout Limits for Gas Turbine Combustors

On the Quick Prediction of Lean Blowout Limits for Gas Turbine Combustors

Large eddy simulation of soot formation in a turbulent non-premixed jet flame

Homogenization Based LES for Turbulent Combustion

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