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Many factors have an influence on the development of compartment fire notably  on its heat release rate as well as on its capability to propagate and  become a flashover situation. The main element which rapidly conveys fire  from a compartment to another is hot smoke flowing out through openings of  the compartment source of fire. The present work aims to experiment the  impact of the variation of heat release rate of the source on the behaviour  of fire. So, five fire tests with different heat release rates were thus  carried out in a reduced scale room. Temperature of burned gases inside the  room, were measured during tests by sensors connected to a data acquisition  system. Results revealed that temperature of burned gases as well as its  content in carbon monoxide, evolves differently according to two ranges of  the incoming air/outgoing gases ratio. The first range of which the ratio is  lower than 2, corresponds to the case where both parameters decrease  rapidly. The second range of which the ratio is higher than 2, corresponds  to the case where both parameters decrease moderately. The transition from  the first to the second range, points out the passing from the  ventilation-controlled fire to the fuel-controlled fire. A relation  expressing the variation of the mass flow rate of outgoing burned gases  according to the heat release rate of the fire source has been given.

Effect of ratio between incoming cool air and outgoing hot gases on behaviour of compartment fire