Ignition mechanism

The three approaches to the analysis of basic ignition mechanisms have recently been reviewed in detail by Price (P8). As he indicated, none of these approaches can be considered as verified, although each offers potential insight into the basic mechanisms. Proponents of each of these approaches are actively studying the problem it is hoped that definitive conclusions will be forthcoming in the near future. 

Ishii, K., Tsukamoto, T., Ujiie, Y, and Kono, M., Analysis of ignition mechanism of combustible mixtures by composite spark, Combust. Flame, 91,153,1992. 

Fundamentally all 13 kinds of ignition sources mentioned and also described in detail in EN 1127-1 must be considered. In EN 1127-1, the descriptions refer to both the ignition mechanisms of the different kinds of ignition source and the necessary scope of protection (material- and zone-dependent). The ignition sources should be classified according to the likelihood of their occurrence in the following manner ... 

Detonations can be initiated by ignition, mechanical impact, friction, or electromagnetic radiation, and physical confinement of the material is often but not always required. Thus, a sample of the potassium salt of 1-tetrazolylacetic acid placed on a surface at room temperature will explode if any part of the sample is heated to >200 °C (e.g. by a hot flint spark or a flame) [90]. If the conditions for detonation are met, the time between shock-initiation and detonation is about 1 ps only [91]. 

Ignition Mechanism (4,7). Hydrogen, as we have already noted, ignites with a remarkably low ignition energy. It is also easily ignited with many other sources of energy, some of which are listed ... 

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