This paper considers a variation on Conditional Moment Closure (CMC) modelling for turbulence-chemistry interaction called the Uniform Conditional State (UCS) model and its application to the prediction of swirl-stabilized flames. UCS is essentially a zero-spatial dimensional, multi-condition CMC method.  Unlike conventional CMC methods, for flames that are in (statistically) steady flows, the chemistry can be solved *a priori* in conditional space only with reactive scalars mapped into real space by taking the inner product of the resulting conditional averages with the joint probability density function (JPDF) of the conditioning variables, here taken to have a presumed form that is a function of the mean and variance of the conditioning variables. Two conditioning variables are used, mixture fraction and progress variable, which allow for the resulting chemistry table to be applicable to both premixed and non-premixed combustion but also in the partially-premixed regime.  In doing so, this new approach is promising to be highly suitable for simulating industrial applications and complex geometries. Another promising aspect is the universal applicability to different fuels and kinetic mechanisms providing great flexibility to the user of this method.

Ultimately it is intended to aid the development of industrial burners by providing detailed information about the local composition and emission production, while keeping computational costs significantly low. Not only does this provide additional insight into global emissions and fuel consumption of a new design, but it allows for variability between different stages of mixedness as well as the testing of, for example, alternative fuels in established burner configurations.

In this present study a comparison of different fuels and initial conditions is being conducted to analyze their effect on the resulting UCS solution - meaning the chemical source-terms, composition and thermodynamic state in conditional space.  Furthermore the use of the UCS solutions as a predictive method in a RANS simulation will be presented here. The paper will illustrate the UCS predictions and compare them to simpler, more established modelling approaches, as well as experimental data. The experimental test case chosen was a model combustor of high technical relevance which demonstrates the applicability of the UCS method to industrial designs.

Promising results led to further investigations being done by applying this new tool to a real industrial combustor within the framework of this collaboration with MTU Aero Engines AG.  
First results of the latter can be followed up on in the paper by L. de Guillebon et al. of this conference.


Evaluation of the Uniform Conditional State Method for Turbulence-Chemistry Interaction Modelling of Swirl-Stabilized Flames

Division / Sponsor:
International Gas Turbine Institute (IGTI)

Paper Proceedings: https://asmedigitalcollection.asme.org/GT/GT2020/volume/84058

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