Experimental study on flame height, gas temperature and oxygen concentration profiles under spray fire scenario in an enclosed compartment

摘要

Spray fire is one of the most frequent fire accidents in ship engine compartments, drawing much attention to spray fire safety. Currently, a series of spray fire tests was conducted in a 2.0 m (L) x 2.0 m (W) x 1.88 m (H) enclosed compartment. Experimental results indicate that the combustion process can be divided into three stages and the injecting pressure has significant effect on the flame height, gas temperature, oxygen concentration, etc. The dimensionless flame height is proportional to the 1/9 power of the dimensionless heat release rate. With the increase in injecting pressure, both the slope of gas temperature rise and maximum average gas temperature increase, meanwhile the corresponding oxygen concentration and average oxygen concentration all decreases linearly. For estimating the average gas temperature and average oxygen concentration, two corresponding equations were established and verified by the current measured data. Moreover, the dimensionless gas temperature correlates well with the dimensionless oxygen concentration.