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A Numerical Study on the Effects of the Wind Velocity and Height of Grassland on the flame Spread Rate of Forest Fires  

Bae, Sung-Yong (중앙대학교 기계공학부)
Kim, Dong-Hyun (국립산림과학원 산불연구팀)
Ryou, Hong-Sun (중앙대학교 기계공학부)
Lee, Sung-Hyuk (중앙대학교 기계공학부)
Publication Information
Fire Science and Engineering / v.22, no.3, 2008 , pp. 252-257 More about this Journal
Abstract
With the rapid exuberant growth of the forest, the number and size of forest fires and the costs of wildland fires have increased. The flame spread rate of forest fires is depending on the environmental variables like the wind velocity, moisture of grassland, etc. If we know the effects of the environmental variables on the fire growth, it is useful for wildland fiIre suppression. But analysis of the spread rate of wildland fire for these effects have not been established. In this study, the effects of wind velocity and height of grassland fuel have been investigated using the WFDS which is developed at NIST for prediction of the spread of wildland fires. The results showed that the relation between the height of the fuel and the spread rate of the head fires is, and the spread rates related to the wind velocity are predicted 17% less than the experimental results of Australia. When the wind velocity is over 7.5m/s, the concentration of pyrolyzed gas phase fuel is getting low due to fast movement of pyrolyzed gas, the flame spread rate becomes slow.
Keywords
WFDS; Forest Fire; Flame Spread Rate; Wind velocity; Height of grassland;
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