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Abstract
The use of chemical kinetic calculations to predict the formation of nitric oxide in spark ignition engines and gas turbine combustors is reviewed. Although the basic chemical kinetic mechanism is the same in both cases, differences in thermodynamics and fluid mechanics account for different NO emission levels. In spark ignition engines it is necessary to account for temperature gradients in the engine. In gas turbines the NO kinetics are frozen before the NO is formed in equilibrium amounts.