Experimental Study on Suppression of n-Heptane Pool Fire with Water Mist under Longitudinal Ventilation in Long and Narrow Spaces

Abstract

This paper studies suppression of n-Heptane pool fire with water mist under different longitudinal ventilation velocities in a long and narrow space. Through the suppressing experiments with two different spraying positions and seven ventilation speeds, it is found that the extinguishment of fires has a close relationship with the fuel temperature. Moreover, the fuel temperature, when the fire is extinguished by spraying at different positions, is almost the same within the measurement ranges, and it tends to decrease as the wind speed rises. Mechanism studies show that the coupling effect of dilution and replacement of oxygen and fuel surface cooling is the main mechanism in n-Heptane fire extinguishment of water mist under longitudinal ventilation. In addition, the ability to efficiently cool the fuel plays a determinant role in the n-Heptane pool fire suppression.

Study of the effectiveness of water mist curtain in blocking fire-induced smoke in tunnel by means of CFD simulations

“…Obviously, an essential question is to examine to what extent the fire-induced heat and smoke can be blocked by the water system. So far, there is still a lack of investigation of using water systems as a curtain to prevent smoke and heat spreading in tunnel, and there are no clear design specifications [4][5][6][7][8][9][10][11][12]. Therefore, it is of great importance to study the effectiveness of water systems with respect to blocking smoke and heat in tunnels.…”

Experimental study of the effectiveness of a water system in blocking fire-induced smoke and heat in reduced-scale tunnel tests

“…To date, many research studies have been conducted concerning the use of water mist systems in enclosures (Jenft et al, 2014;Kim and Ryou, 2003;Prasad et al, 2002;Yang et al, 2010). Restricting the survey to water mist in tunnel configurations, experimental and numerical approaches are found on the interaction between water mist and fire source (Blanchard et al, 2014;Hart, 2006;Li et al, 2013).…”

“…Small-scale experiments were carried out by Ingason (Ingason, 2008) ,Chen (Chen et al, 2009), and Li (Li et al, 2013) on the suppression efficiency between water mist characteristics (water flow rate, mean diameter, spray angle, etc.) and tunnel environment (ventilation condition, heat release rate, etc.…”