This work raises the issues of feasibility of developing a conceptual approach to the detailed differentiation of combustion modes. Its goal is to try to characterize the modes of combustion for gas-, vapor- and dust-air mixtures as an explosion or deflagration (clap), calculated dependences, allowing to identify an explosion and a higher deflagration (clap) in accordance with the fire and explosion hazard indicators and criteria that characterize their consequences.
Although these processes are close to each other, they run at different speeds, are implemented at different pressures and are characterized by certain, different level of injury to people, the level of damage and (or) destruction of building structures, i.e., the consequences of an accident. This paper defines the indicators and criteria that allow to identify the combustion mode as a deflagration (clap) or as an explosion of flammable gas-, vapor-, and dust-air mixtures based on the fire and explosion hazard indicators of mixtures determined by calculation and data describing their consequences.
Definitions (terms) and criteria are proposed that allow to identify the concepts as an explosion and as an increased deflagration (clap). Increased deflagration (clap) — ignition and subsequent combustion of combustible gas-, vapor-, dust-air mixtures with an apparent speed from 10 to 60 m/s without the formation of a shock wave, with a pressure increase of no more than 5 kPa and not accompanied by damage and destruction of load-bearing structures.