In the paper there is presented the methodology of researches as well as the numeric researches results, which
aim is the analysis of fumes flow parameters in the exhaust manifold in the diesel engine, particularly the velocity, the
temperatures and the turbulence of gas. It has been presented that the research methodology depending on three
dimensional model of air flow in the outlet systems with the application of standard numeric methods based on the
principles of conservation of: mass, energy and momentum can be the way of researches. The model may be to be the
basis for performing changes in geometry of outlet system concerning minimizing the flow losses and shaping the field
of velocity. The model enables of calculations of outlet system of internal combustion engines on the stage of its
construction. Results show that the numerical simulations methods are one of the possible to use for achievements of
investigations low costs, especially that the hardware engine parts must be not prepared. Inter alia, complete model of
exhaust manifold, model of fluid volume fitting in the manifold with the numbers of ducting, the grid with applied edge
conditions, linear outline of static pressure on the walls of exhaust manifold, total pressure, tension, distribution of
total temperature, distribution of fluid velocity on the walls, turbulence intensity are presented in the paper.
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