Abstract
The paper describes an approach for predicting the time variation of the state of a non-adiabatic reacting charge undergoing a change in density, such as that in a motored autoigniting engine or the ‘end gas’ of a spark ignition engine. To describe accurately the rates of chemical reactions involved and to account for the production of intermediate combustion products and their survival, detailed chemical kinetics involving chain reactions are employed. To test the approach developed, hydrogen gas is employed as a fuel in the closely controlled environment of a specially developed compression apparatus which is closely akin to that of the piston engine, yet more amenable to control and analysis. Subject to the availability of reliable detailed kinetic data for the reactions involved very good agreement between theory and experiment can be achieved. The future implications and utilization of such an approach is discussed.

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