FLUID FLOW AND TURBULENCE MODELLING IN 4.VALVE ENGINES

Abstract eng:
In this paper some results concerning the effect of turbulence model variation onto flame propagation in a particular combustion chamber with four tilted valves were elucidated. Flame propagation was represented by the evolution of spatial distribution of temperature in various cut-planes within combustion chamber while the flame front location was determined by dint of zones with maximum temperature gradient. The results presented are only a small part of broader on-going research activity in the field of multidimensional modeling of reactive flows in combustion chambers with complicated geometries encompassing various models of turbulence, different fuels and combustion models. The effect of turbulence model variation was analyzed through comparison of results of flame propagation obtained with eddy-viscosity model i.e. standard k-ε model of turbulence and results obtained with k-ξ-f model of turbulence. In the case of combustion all differences ensuing from turbulence model variation encountered in the case of non-reactive flows were annihilated entirely. Namely the interplay between fluid flow pattern and flame propagation is invariant as regards both turbulence models applied.

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