Abstract
This paper presents the results on the simulation of “hot spot” ignition in H 2 −O 2 and CH 4 -air mixtures. The hot spots which are generally considered to be formed in the Ottoengines are caused due to the non-uniformities in temperature or pressure. They generally have the potential to ignite the reacting mixture due to the increased temperature with respect to the surrounding. Since the ignition delay is highly temperature dependent, the hot spot ignites much earlier than its surrounding, leading to space- and time-dependent processes governed by the superposition of chemistry, gas-dybamics and transport. Here, simulation of “hot spot” ignition is performed in one dimensional geometries with multi-step chemistry and multi-species transport model. The governing equations after spatial discretization on an adaptive non-uniform grids are solved numerically by implicit methods. The results show that the model used is able to describe the spatial and temporal development of ignition, propagation, and the transitional phenomena from deflagration to detonations, that are initiated by hot spots.
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