Study of Mechanisms of Increase in the Combustion Rate of Diluted Granulated Ti + C Mixtures for Varied Amounts of Co-Current Gas Flow

Abstract

In this work, we investigated the dependence of the burning rate of a Ti + C granulated mixture diluted with inert corundum granules by 30 and 60 wt % on the amount of co-current gas flow. A strong influence of the inert (argon) and active (nitrogen) gas co-current flow on the propagation velocity of the combustion front was found. When the mixture is diluted by 60%, in the whole range of gas flow values, the qualitative correspondence of the experimental burning rates with semi-experimental calculations is shown, when the experimentally detected speed increase due to compression of the mixture during the combustion process is added to the speed calculated by the theory of filtration combustion. When the mixture is diluted by 30%, a significant excess of the experimental velocities in the gas flow over the calculated ones indicates a significant role of the internal radiation heat losses. When nitrogen flows above 600–700 L/h, a sharp increase in speed can be attributed to the transition of combustion to the convective mode. It was found that lower increments in burning rates in nitrogen than in argon at low gas flows are associated with nitrogen absorption in the interaction with titanium for mixtures diluted with corundum by 30%.