Combustion flares are widely used in oil and gas refinery units in order to burn the unwanted and unused gases. Due to high volumes of the flares feed gases and also the large heights of the flares (even more than 100 meters), appropriate way of providing the combustion air and air-fuel mixing, have significant effects on the flare combustion efficiency and pollutants emissions.One of the main affecting parameters is the wind speed at the site, where the flare is mounted. As the wind speed increases, not only the combustion efficiency of the flare decreases, but also the flame lies on the flare wall and results in increased temperature of the flare wall. Repeated occurrence of this phenomenon can lead to severe damages in the flare wall, as has been observed in Sarkhoon and Qeshm’s refinery. …