Wind Tunnel Experiment for the Firebreak Effect and the Influence on Fire Plume by Surface Roughness.

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In order to discuss the firebreak method and the safety of activities for fire prevention, it is important to clarify the estimative method of temperature of fire plume from burning houses by urban fire.This paper is to clarify the influence on the temperature distribution of fire plume by surface roughness of buildings and wind velocity.1. Wind tunnel tests for surface roughness : Wind tunnel tests were conducted using the scale models (reduced scale 1/200 and 1/140) of built-up area which were constructed by the low-rise buildings.2. A theoretical study of temperature distribution downwind from a plane heat source : The author has attempted to assume a plane source as the experimental model of burning area. Equations for temperature distribution downwind from this heat source were discussed by theoretical consideration and shown as the function of dimensionless temperature (PSI), dimensionless velocity (LAMBDA), Froude number (Fr), and ratio (X/D) of downwind distance (X) to wide (D) of a plane heat source.3. Wind tunnel tests for surface roughness and temperature distribution of fire plume. : In order to examine the relation between above-mentioned theory and experiment, measurements of temperature and velocity were performed on the scale models of built-up area constructed by the low-rise buildings in a wind tunnel which was placed a square vessel for burning alcohol.4.Wind tunnel tests for the flow around the scale model of the highrise building in built-up area which were constructed by low-rise buildings.5. Wind tunnel tests for the firebreak effect and the influence on fire plume by the highrise building in built-up area : The author considered the similarity law of fire plume for a wind tunnel test, and examined the relation between theory and experiments. These similar experiments were satisfied with the validity of the theory.