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A "variational" theory, which gives a least upper bound to the rate of a chemical reaction, is presented. The reaction is represented by the motion of a point in phase space across a trial surface dividing the "initial" and" final" chemical states. The trial surface is well defined in regions of phase space where interactions causing reaction are(More)
According to the underlying concept of the rate-controlled constrained-equilibrium (RCCE) method, the relaxation of a complex reacting system towards the final equilibrium state is governed by a set of active and passive constraints imposed by the internal dynamics of the system that is considerably smaller in dimension than the original system. A set of 10(More)
This report summarizes the key results and conceptual findings from a three year research program on hydrocarbon formation and oxidation mechanisms in spark-ignition engines. Research was carried out in four areas: laminar flame quenching experimental and analytical studies; quench layer studies in a spark-ignition engine using a rapid-acting gas sampling(More)
The basic mechanisms responsible for the production of nitrogen oxide and hydrocarbon emissions from automotive spark-ignition engines are reviewed. It is shown how the formation of nitric oxide is rate controlled in the high-temperature burned gases inside the engine cylinder. A mathematical model which predicts nitric oxide emissions for given engine(More)
According to the underlying concept of the rate-controlled constrained-equilibrium (RCCE) method, the relaxation of a complex reacting system towards the final equilibrium state is governed by a set of active and passive constraints imposed by the internal dynamics of the system, which is considerably smaller in dimension than the original sys tem. A set of(More)
The generation of the mesh consists of diierent steps: Calculation of neighbouring cells { procedure NEICELL For a given cell K i this procedure calculates the cell coordinates K j i of the neighbouring cells K j i. Checking of a cell { procedure CHKCELL For a given cell K j this procedure calculates the coordinates L k of the 2 m vertices of the cell and(More)
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