Novel methodology of the simulation of combustion and flow in propulsion and power generation systems is developed. The basic concept of the methodology and model is division of the working volume into reactors on the ground of equations of motion or semi-empirical models of fluid flow. Each reactor is interpreted as a time-dependent volume with uniform non-stationary parameters. Mass- and heat-transfer between neighbor reactors are simulated. Time variation of chemical composition of working medium is described by equations of chemical kinetics derived in exponential form. Depending on the specific conditions mathematical model of each reactor could include additional “submodels” and corresponding equations of accompanying processes which describe variation of temperature, pressure, mass, enthalpy, etc. Reactor’s approach is realized in invariant computer code NERCHIM. Models of combustion and flow in propulsion systems, developed on the basis of reactor’s approach and NERCHIM software are presented.

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