Abstract
In this paper, we consider the effectiveness of suppression of wooden building fire by the use of water and by varying the beginning time of water application. Several parameters and functions concerning the effectiveness are obtained by analyzing the data of real fires in K city.
Furthermore the effectiveness is simulated by using standard fire condition, G = 300 m2 and ν = 3.0 m/sec, in eq. (4-1) as a case of fire model.
Following results are obtained:
(1) Burnt Area A(t) which is influenced by water application can be calculated by using eq. (3-10) and eq. (3-11).
(2) Necessary water application coefficient q0 can be expressed by the function Burnt Area A0 And coefficient q0 is shown by eq. (4-3) from the method of non-linear least squares.
(3) The water application rate Q is expressed by the function t (time from the beginning of water application). Q2 (a case of the average in K city; eq. (4-6)) is adequate three fire engines if one fire engine's water application rate is expected 1.0-1.2 m3 /min.
(4) It is proved that the necessary and enough number of fire engines is three if the fire area is under 100 m2, and if the water application begins within 10 min. from fire broken out.
(5) We refer to the estimation method of parameters in eq. (3-2), which is the fire spread of formula without fire fighting from applying the method of least squares to eq. (3-6) by using the data of real fire fighting.
