Modeling the Dynamic Behavior of Building Fires.
Final rept. Aug 70-Aug 71,
STANFORD RESEARCH INST MENLO PARK CALIF
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The practical modeling of fire behavior in a burning building requires separate techniques for simulation of the convective and radiative fields about the fire. Previously derived scaling methods for modeling the fluid flow environment in mass fires appear applicable to 116-scale structural fires. The time duration of a fire can be scaled as the square root of a characteristic dimension of the burning structure upon satisfaction of geometric similarity with the model to which it is being compared. The perturbation of the flow, e.g., the smoke column, by the ambient wind is shown to depend on wind velocity, burning rate, and fire size. If the material thickness in a model is increased to about the thickness of combustible sheathing in full-size buildings, the resulting model will exhibit the radiative characteristics of large fires at the low viewing angles pertinent to evaluation of building-to-building fire spread. Although study of ambient wind enhancement of fuel consumption rate and room-to-room fire spread appear to require altogether different modeling techniques, the above model for radiative simulation has potential in these two areas as well. Author
- Safety Engineering
- Structural Engineering and Building Technology