Science and Technology of Energetic Materials

Vol.62, No.2 (2001)


Measurement of heat flux for the UN bonfire test(*in Japanese)
Ken-ichi Miyamoto, Takehiro Matsunaga, Mitsuaki Iida, Shuzo Fujiwara,
and Masatake Iwakura


Combustion experiments were carried out to determine the applicability of a radiometer to the UN bonfire test. At the same time, validity of estimation methods of thermal flux proposed by the United States and sweden in the committee of experts on the transport of dangorous goods was evaluated. Signal flares, smoke powder contained in the signal flares, and a kind of toy fireworks were used as test samples. Major results and conclusions were as follows : (1) the use of a radiometer is effective to assess the effects of themal flux because the heat flux messures with the radiometer well reflected the burning condition. (2) Temperature measurement with a single thermocouple under the test samples was not suitable for the assessment of the thermal flux but helpful to verify the spread of fire. (3) The estimation equations of thermal flux proposed by the United States and Sweden underestimated the maximum value but evaluated the average value adequately. (4) It is necessary to measure the thermal flux directly in the case of articles and low energy substiuices, especially when their burning is intemittent, (5) The ratio of heat of radiation to the heat of combustion was ranged from 0.29 to 0.45, which corresponded to the reported studies.

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