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CFD simulation does an adequate job of predicting temperature globally, so it served well to solve the NOx problems of the past 20 years. However, the combustion challenges that designers need to simulate today are kinetically driven and require detailed chemical simulation. This simulation has been accomplished for over 30 years through the use of idealized chemical reactor modeling using chemistry simulation software packages such as CHEMKIN®. But these packages have always lacked the ability to directly take into account effects of the complex 3-D flow field and geometry. Building ENERGICO networks to represent the local chemical reactions in appropriate regions of the geometry is a proven method of incorporating the effects of both the flow and the kinetics in a single simulation.