Experimental study and fire safety investigation of flame spreading over liquid fuels

Moghadamiyan, Hossein and Najafi, Arash and Shafaghi Asl, Seyyed Karim (2015) Experimental study and fire safety investigation of flame spreading over liquid fuels. Masters thesis, university of Mohaghegh Ardabili.

Text (بررسی آزمایشگاهی ایمنی گسترش شعله روی سوخت‌های مایع) Hossein Moghadamiyan.pdf Download (275kB)

Abstract

Inadequate information for fire engineering, safety rules and standards causes fatal fires during the history. These events in addition to thousands of human deaths, causes destruction of cities, industrial objects and other valuable things. For this reason, people are always looking for solutions to increase the safety and protection of life and their assets are in front of the fire. The steps of a fire are as such: increasing temprature to combustion point, combustion, flame spread and fire and finally extinction.To prevent occuring a fire and controlling it, good understanding of the phenomenon of flame spread is obvious and necessary. Results of tests measuring the speed of flame spread and ignition temperature in the absence of wind was reported in this research. Effect of adding solid particles on flame spread speed was studied and also effect of variables of fuel type and type of solid particles and concentration of solid particles on flame spread speed was investigated. It also studied effect of this variables on the ignition temperature. Sawdust and ash were used as an additive solid particles and kerosene and diesel were applied as a fuel. Totally, results showed that adding sawdust particles decrease kerosene flame spread speed 18.18% to 37.87% and increase diesel flame spread speed 10.5% to 31.5% respectively. It also increase kerosene ignition temperature up to 31.5% and diesel ignition temperature to 21.3% in lower concentrations.Furthermore, adding ash particles decrease kerosene flame spread speed 27.27% to 30% and diesel flame spread speed 5.2% to 26.3% respectively. It also increase kerosene ignition temperature 23% to 32.7% and diesel ignition temperature to 15.7% to 18.7%. Alsoin this thesis, effects of mixing fuels with different compositions on the flame spread speedhas been investigated. Results indicated that experimental rate of mixtures’ flame spread was lower than theorical amounts and tends to heavier fuel. The effect sawdust and ash particles onreducing the rate of flame spread in kerosene is more than nano particels, while in diesel effect of nano particels was more in low concentractions ,and it changes like oil in high concentractions. It has been concluded that these two parameters depend on factors such as type of fuel, additive materials andinitial fuel temperature.

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