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Study on the Prevention of Fire-Spread Caused by Hot Upward Current
Sizuo YOKOI
建築研究報告 No.34, 1960 建設省建築研究所
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＜概要＞
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As new problems of
fire protection which were born after War, the following two can be enumerated;
- Protection of television towers against fire,
- Protection of spread of fire from an opening of a room to the opening
of the upstairs room with large openings.
In order to consider these problems, it is first of all necessary to investigate temperature distribution of the upward current from a burning house at windless condition. Problems concerning characteristics of hot upward current belong to the field of thermohydrodynamics, and so it is of extreme difficulty to solve them in directway. On the other hand, for financial reason, it is also impossible for us to solve them by performing a number of tests with full-scale fire experiment.
In solving these difficult problems, the author performed a
number of model experiments of various scales in the laboratory, basing
on these results and refering to the equations of motions in hydro-dynamics
and of heat continuity, he tried to find the relations among the important
factors in these phenomena and to find the approximate similarity law between
the model and full-scale experimental fire. The results were compared with
those of the tests performed 4 times. It was successfull in this way to
establish a series of systematic theories in this field of fire-study which
had been left unsolved.
The two new problems of fire-protection described at the beginning
have been easily solved by applying these theories. They are reported in
this paper.
The author wishes to express his hearty thanks to Dr. T. Kinbara,
M. Hamada, H. Hatakeyama and K. Fujita, for their kind encouragement and
guidance throughout this work.
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