Abstract: Experiments of 1/3 scale were carried out to investigate the effect of outdoor wind on stratification characteristics and natural smoke exhaust in corridors. Fire power, outdoor wind speed and outside window size were variables and stratification characteristic of fire smoke in the corridor and the effect of natural smoke exhaust was judged. Critical failure wind speed of temperature stratification in the corridor and the critical failure wind speed of natural smoke extraction were found out. The relation between the dimensionless fire power and dimensionless critical failure wind velocity were researched by dimensional analysis and data fitting. It was found that there is a good linear relationship between dimensionless critical failure wind speed of temperature stratification and dimensionless fire power. The critical failure wind speed of temperature stratification increases with the decrease of window size.There is a significant logarithmic function relationship between the dimensionless critical failure wind speed of natural smoke exhaust and the dimensionless power of fire source. When the size of the window is the same, the higher the power of the fire source is, the higher the critical failure wind speed of natural smoke exhaust is.

Key words: smoke stratification, outdoor wind, natural smoke exhaust, critical failure wind velocity