Large Eddy Simulation of Turbulent Combustion at Supercritical Conditions
The primary goal of this project is to develop and validate turbulence and combustion models for large eddy simulation (LES) of combustion under supercritical conditions relevant to direct fired supercritical CO2 power cycles. Such models have four major components: real gas equation of state along with corresponding thermodynamic properties, transport properties, generalized description of heat and mass diffusion and additional subgrid scale (SGS) effect occurring at elevated pressures. In this study, proof of concept is demonstrated by incorporating models for all these components within LES formulation consisting of mass, momentum and energy conservation as well as scalar transport equations. Heat and mass diffusion are described by diffusion models for binary mixtures. The real gas equation of state includes cubic Peng-Robinson which is taken into account along with corresponding thermodynamic mixture variables. The aforementioned constituents are implemented in an in-house high-order finite-difference code and fully appraised by performing LES of temporal mixing layer at supercritical pressure involving transport of passive scalars. Evaluation of the SGS models is be done by a priori and a posteriori assessments against data generated by conducting direct numerical simulation (DNS) of the same layer. In this final report, a concise description of mathematical formulations used for each modeling component is provided. Subsequently, the flow configuration used for model assessments is described and finally, some results demonstrating the accuracy and feasibility of this approach are provided.
- Research Organization:
- Dena Scientific, Wellesley, MA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- SC0017097
- OSTI ID:
- 1468303
- Type / Phase:
- SBIR (Phase I)
- Report Number(s):
- DOE-DENA-17097
- Country of Publication:
- United States
- Language:
- English
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