ABSTRACT
Typical enough ignition sources of combustible materials (heated up to high temperatures particles of metals and nonmetals) are described in the domestic and foreign literature [1-5]. Russian works [1-3] are devoted to ignition research of litter of coniferous and deciduous trees by sufficiently small size local heat sources. Results of natural observation of “fire brands” of enough big size formation and their influence on layer of forest fuel [4, 5] are described in foreign literature sources. Researches [6] with samples from cellulose on which the spherical particles of the various sizes made of steel dropped out. It is possible to make a conclusion, that the range of particles of the relative small size is not studied enough. Besides, there are no data about ignition delay times by heated particles for enough widespread types of forest fuel, in particular, grassy rags. In Refs. [4, 5] “fire brands” of any form which were also artificially formed at the special stand are considered [7]. However, observation over control ignitions shows that typical sources of heating are the particles of nonmetals in the form of the small sizes parallelepipeds [1-3].
