Experiment on the fire under the sloped ceiling and its relationship with the flame length

There are many slopes in ceiling in many buildings. For instance, escalators structure and roofs are ones that come to mind easily. Also, from designs point of view, buildings which have sloped ceilings are becoming increased.
It is empirically known that the sloped portion boost the spreading of fire easily. In order to analyze this quantitatively, an experiment was done with the ceilings of horizontal and sloped in 15 degree and 30 degree structures and their fire spreading states with those different structures have been compared.
In those fire experiments, only optical image camera has been used so far. However, it can not capture the images of whole flames correctly because of its tendency to generate halation in the fire image.
On the other hand, the TVS can capture the image of dangerous high temperature portion of flames, which visual camera cannot do like avoiding halation.
It was verified by TVS that, as the length of flame become longer, the amount of heat radiated from the flame increases and it heats up more the surrounding objects by increasing the possibility of spreading fire.
Therefore, the thermal image of flames by TVS provides us a very important data to analyze the thermal destructing regions correctly.
As a result of experiment, it was proved quantitatively that the flame becomes longer and increases the possibility of fire spreading, as the inclination of the slope becomes greater at flame contacting portion.

Photo of the experiment on the ceiling of horizontal structure

Photo of the experiment on the ceiling of horizontal structure

Photo of the experiment on the ceiling with angle of 15 degrees

Photo of the experiment on the ceiling with angle of 15 degrees

Photo of the experiment on the ceiling with angle of 30 degrees

Photo of the experiment on the ceiling with angle of 30 degrees

Thermal image of the experiment on the ceiling of horizontal structure

Thermal image of the experiment on the ceiling of horizontal structure

Thermal image of the experiment on the ceiling with angle 15 degrees

Thermal image of the experiment on the ceiling with angle 15 degrees

Thermal image of the experiment on the ceiling with angle 30 degrees

Thermal image of the experiment on the ceiling with angle 30 degrees

(Thermal images by TVS-8100)

  • * Information was provided by Research Institute of Construction, attached to the Ministry of Construction

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