自由空間燃料蒸気雲爆発の特性とスケール則

概要

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Small scale experiments of unconfined fuel vapor cloud explosions are carried out for various masses of fuel (2.9-25.2 g of iso-butane), and compared with the results obtained by the numerical analysis based o the spherically expanding piston model, where the volume of the piston is expressed by a simple function of time. A self-consistent scaling law of the unconfined fuel vapor cloud explosion is found. The size and the duration of the fireball, and the peak overpressure generated by the explosion of M kg of hydrocarbon fuels, are approximated as follows, although the dispersions in experiments are large. The maximum diameter of the fireball D_<max>≒5.5 M^<1/3> [m]. The duration of the fireball t_b≒1.6 M^<1/6> [s] ; and the peak overpressure of the blast Δp_<max>≒1.6×10^3 M^<2/3>r^<-1> [Pa], or Δp_<max>/p_0≒5.7×10^<-3>M^<1/3>(r/r*)^<-1>, where p_0 is the initial pressure and r/r* is the so-called scaled distance. These relations are in good agreement not only with the present experiments but also with the existing experiments for both larger and smaller fuel vapor cloud explosions.
一般社団法人日本機械学会の論文
1989-08-25