LES modeling of premixed combustion using a thickened flame approach coupled with FGM tabulated chemistry

The tremendous increase in energy demand due to increased population and rapid economics results in an increased level of atmospheric pollutants and global warming. The global shift to the use of renewable clean energies still has some restrictions in terms of the availability of the advanced reliable technologies and the cost of application compared to conventional fossil fuels. Until we can have this full conversion to renewables, the development of novel techniques for clean combustion of fossil fuels is appreciated. Forced by the simultaneous increased pressure of strict emissions regulations and the target of limiting the global warming to 2 °C, gas turbine manufacturers developed novel combustion techniques for clean power production in gas turbines as per the present review study. These novel techniques depend either on modification in the existing combustion system or developing novel burners for clean power production. In this review, different clean combustion techniques are presented including ...

Review of Novel Combustion Techniques for Clean Power Production in Gas Turbines

This study focuses on the modelling of turbulent lifted jet flames using flamelets and a presumed Probability Density Function (PDF) approach with interest in both flame lift-off height and flame brush structure. First, flamelet models used to capture contributions from premixed and non-premixed modes of the partially premixed combustion in the lifted jet flame are assessed using a Direct Numerical Simulation (DNS) data for a turbulent lifted hydrogen jet flame. The joint PDFs of mixture fraction Z and progress variable c, including their statistical correlation, are obtained using a copula method, which is also validated using the DNS data. The statistically independent PDFs are found to be generally inadequate to represent the joint PDFs from the DNS data. The effects of Z–c correlation and the contribution from the non-premixed combustion mode on the flame lift-off height are studied systematically by including one effect at a time in the simulations used for a posteriori validation. A simple model inc...

Modelling of turbulent lifted jet flames using flamelets: a priori assessment and a posteriori validation

In this work, a turbulent premixed Bunsen flame is simulated using a RANS approach for turbulence and a flamelet model for turbulence–chemistry interactions. In this flamelet model, the mean reaction rates are approximated using a progress variable approach and a Flame Prolongation of ILDM (FPI) for chemistry reduction. This method requires a presumption for the shape of the probability density function of the reaction progress variable. Two shapes have been examined: a widely used β-function and a modified laminar flamelet PDF. Radial distributions of the calculated temperature field, axial velocity and chemical species mass fraction have been compared with experimental data. This comparison shows that using the modified laminar flamelet PDF leads to predictions that are similar, and often superior to those obtained using the β-PDF. Given that the new PDF is based on the actual chemistry – as opposed to the ad hoc nature of the β-PDF – these results suggest that it is a better choice for the statistical ...

Presumed PDF modeling for RANS simulation of turbulent premixed flames

A Filtered Tabulated Chemistry model for LES of stratified flames

Study on the potential of BML-approach and G-equation concept-based models for predicting swirling partially premixed combustion systems: URANS computations

In order to simulate the premixed turbulent flame and to study the thermodynamical and chemical state in the post flame region we integrate a number of appropriate submodels in a complete model. The flame front position is described as an iso-surface of a field variable G, and chemistry and turbulence-chemistry interaction models are conditioned on the flame front position following the conditioned progress variable approach (CPVA). Three special features of the model have been addressed to clarify following questions: (1) Is it really necessary to apply the conditioned progress variable approach, or is the ILDM based on the multivariate presumed PDF alone able to predict the flame behavior with reasonable accuracy? (2) Is the CPVA based on ILDM notedly advantageous compared to that based on the chemistry equilibrium? (3) How noticeable is the influence of some model parameters for the description of the flame brush thickness on the prediction of species concentration in the postflame region? For this purpose, some simulation results are presented and compared with experimental data of a turbulent premixed flame, the so-called “F2” case experimentally investigated by Chen et al. [Combust. Flame
 107 (1996) 223–224]. Comparison results with different model combinations along with equilibrium chemistry consideration reveal that the CPVA based on ILDM achieved better agreement with experimental data provided suitable value for the model parameter is used.

Modeling and 3D-Simulation of the Kinetic Effects in the Post-Flame Region of Turbulent Premixed Flames Based on the G-Equation Approach

Swirl flows play an important role in modern combustion systems such as gas turbines, aero propulsion systems etc. Next to desirable effects such as enhanced mixing such flows often exhibit aerodynamical instabilities called precessing vortex core. The configuration under study here represents a model Gas Turbine(GT) combustion chamber and features the main properties of real gas turbine combustors: a confined swirled flow with multiple recirculation zones and reattachment points, resulting in reacting case in a partially premixed methane/air aerodynamically stabilised flame. This flame exibits also precessing vortex core (PVC). The present study especially concentrates on an evaluation of the performance of different URANS-based model-combinations in predicting this confined swirling reacting flow exhibiting such aerodynamic instabilities. For this purpose an extended Bray-Moss-Libby model and a G-equation based approach, both coupled to the mixture fraction transport equation to account for partially premixed effects, are applied. Their prediction potential in capturing partially premixed combustion properties is appraised by comparison with LDV, Raman and PLIF measurements. It turns out that the influence of the combustion model on simulation results of the flame front stabilisation or mean flow field is not obvious. Nevertheless it could be mentioned that the computation time with G-equation was approximately three times longer than with BML model due to the reinitialization needed in steady case calculations and 2 times longer in case of unsteady calculations.© 2007 ASME

Numerical Study of the Precessing Vortex Core in a Confined Partially Premixed Swirl Combustion System

Modelling of Premixed Combustion Using G-Equation in RANS Context

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Papers

Study on the potential of BML-approach and G-equation concept-based models for predicting swirling partially premixed combustion systems: URANS computations

Modeling and 3D-Simulation of the Kinetic Effects in the Post-Flame Region of Turbulent Premixed Flames Based on the G-Equation Approach

Numerical Study of the Precessing Vortex Core in a Confined Partially Premixed Swirl Combustion System

Modelling of Premixed Combustion Using G-Equation in RANS Context