COMBUSTION RESEARCH & FLOW TECHNOLOGY INC — National Aeronautics and Space Administration SBIR Phase I: A1.03

Description

Electric propulsion represents an attractive path for reducing overall emissions. For larger commercial aircrafts operating in the mega-watt range, power turboelectric and hybrid electric aircraft propulsion will continue to rely on gas turbine engines/generators to provide part of the thrust, charging batteries and driving generators. As a result, reduction of emissions such as oxides of nitrogen (NOx) remains a key concern. The innovation proposed is a software toolkit supporting high-fidelity yet computationally-tractable predictions of NOx emissions and other pollutants in gas-turbine engines/generators within the context of unsteady Computational Fluid Dynamics (CFD) simulations. A well-known difficulty limiting the accurate prediction of NOx levels in turbulent flames is related to the fact that NOx production can evolve through several different chemical pathways characterized by drastically different time scales. In this regard, the overall objective of the proposed SBIR program is to develop and implement an accurate modeling extension to CRAFT Tech?s parameterized LEM-CF turbulent combustion modeling framework to address pollutant formation such as NOx in a computationally-tractable manner and by capturing the relevant characteristic chemical time scales. The Phase I effort is intended to build the foundation of the proposed software toolkit by addressing the feasibility of the key attributes of predictive accuracy, computational efficiency, software portability and general applicability.