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This study investigates the impact of ventilation, specifically modeled by a radiator fan, on heptane pool fires within a military ground vehicle engine compartment. Experiments were conducted in a 2.44 m3 scale-1 compartment with varying fan-generated inflow velocities, initial fuel thicknesses, and pan diameters. The primary objective is to comprehensively assess how ventilation conditions affect pool fire behavior, focusing on properties such as mass loss rate, heat release, temperature, and heat flux in both the boiling and steady stages. The results reveal that the boiling stage occurs at initial fuel thicknesses of 10 and 15 mm, allowing us to analyze the boiling-to-steady ratio. This ratio exhibits variation across parameters. For burning duration, the ratios range from 0.45 to 0.93, while for mass loss rate, the ratios range from 2.3 to 3.5. Regarding total heat flux, the ratios span from 2.5 to 4. The boiling-to-steady ratio for temperature varies by position: in the vertical tree, it ranges from 1.1 to 1.7; in the ceiling tree, it ranges from 2.2 to 2.9; and in the ceiling side tree, it ranges from 1.2 to 2.25. Ventilation influences the boiling-to-steady ratio. Increasing inflow velocity generally increases the ratio for burning duration and ceiling tree temperature while decreasing the ratio for mass loss rate. The impact of ventilation on other properties depends on pan diameter and initial fuel thickness. [ABSTRACT FROM AUTHOR]

Both military and civilian vehicles are prone to fire, with severe potential consequences in terms of material and life losses. Vehicles generally contain highly combustible and flammable materials, such as gasoline, lubricants, oil, electronic devices, rubber, plastics, and so on. At the same time, fire ignition sources are present in vehicles in electronic devices, friction, heat, etc. Fire ignition can also be caused by external sources, especially in military applications (aggression on the vehicle). Thus, appropriate measures and fire-fighting systems should be implemented to mitigate the risk of fire in military and civilian vehicles to ensure passenger safety and preserve the vehicles' mobility. Halon was previously commonly used as a fire-fighting agent in military and civilian vehicles but is currently phased out due to environmental issues. In this context, this paper aims to review the research advances and progress over the last 50 years in fire-fighting systems and agents employed in both civilian and military vehicles for land, sea, and air applications. [ABSTRACT FROM AUTHOR]