Bulletin of Japan Association for Fire Science and Engineering

Paper

On the Upward Stream from the Heat Sources arranged on the Circle.

Shizuo YOKOI

1955 Volume 5 Issue 1 Pages 1-4
Published: 1955
Released on J-STAGE: February 25, 2015

DOIhttps://doi.org/10.11196/kasai.5.1_1

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The temperature distribution in the upward stream from the heat sources is investigated. Near the sources, the upward stream from every source, ascends concentrating to the central vertical axis. In the region where the height from the source exceeds the limit value, the behaviour of the hot stream is equal to that of the stream arose from the point heat source having the same intensity. The similarity theory of the upward stream is discussed in this paper.

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Flash Point Measurement.

Nobukazu SODA

1955 Volume 5 Issue 1 Pages 5-8
Published: 1955
Released on J-STAGE: February 25, 2015

DOIhttps://doi.org/10.11196/kasai.5.1_5

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This is a theoretical and experimental study on flash point measuring method.
This report aims to investigate many factors of deviation about the flash point determination.

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Experiment of a Full Size Fire in a Protected Steel Construction.

Kunio KAWAGOE

1955 Volume 5 Issue 1 Pages 9-12
Published: 1955
Released on J-STAGE: February 25, 2015

DOIhttps://doi.org/10.11196/kasai.5.1_9

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A first story of a fire protected steel construction house was burned for experiment, on which the combustion speed, the flame temperature, the vertical pressure distribution on the inner wall and the expansion of walls were measured. Results were as follows :
1) The maximum temperature reached very high, about 1100°C.
2) The combustion speed was very great, about 40kg/min, and it was compared with the theoretical value, explained in the same bulletin Vol. 2 , No. 1.
3) Expansion of walls was very small, and therefore the decrease of the earth-quake resistance of this house after the fire, was concluded to be very small.

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Study on the Fire Protection of Town-Risk. (Fire Extinguishment)

Tatunobu ISAWA

1955 Volume 5 Issue 1 Pages 13-16
Published: 1955
Released on J-STAGE: February 25, 2015

DOIhttps://doi.org/10.11196/kasai.5.1_13

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For the purpose of selection of the most available fire-protective means of town-risk, the author proposed a measure of the effects of various fire-protective means. And some applications are examined on the effects of reinforcement of fire-extinguishment.

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Ignition of Wood (5) On the Thermal Decomposition Rate of Wood.

Kazuo AKITA

1955 Volume 5 Issue 1 Pages 17-22
Published: 1955
Released on J-STAGE: February 25, 2015

DOIhttps://doi.org/10.11196/kasai.5.1_17

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Over-all rate of thermal decomposition in wood and its components (cellulose, lignin) was measured at a low pressure (2 mm Hg) by the spring method.
The conclusions were as follows :
( 1 ) The over-all rate of carbonization of wood is composed of the rates of all components.
( 2 ) The rate of each component is given with the 1st order reaction formula.
( 3 ) Carbonization rate of components become large in order of hemicellulose, lignin, cellulose.
( 4 ) Activation energy of carbonization is estimated as follows ; cellulose 31 Kcal, lignin 26 Kcal.
( 5 ) Rate in atmosphere is larger than rate in low pressure.
( 6 ) Residuum of carbonization becomes large in order of lignin, wood, cellulose and its weight becomes small rapidly with increase of temperature.

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Forest Fire Hazard in Kitami District, Hokkaido

Katsura INOUE, Masao OKANOUE

1955 Volume 5 Issue 1 Pages 23-24
Published: 1955
Released on J-STAGE: February 25, 2015

DOIhttps://doi.org/10.11196/kasai.5.1_23

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In Hokkaido the forest damage caused by fires is the greatest in Kitami district, the fact being foreseen from its climatic and topographic conditions. As the causes of fires are almost all artificial, it would be possible to take measure against the forest fire hazard, if the elements having influence upon the forest fire hazard can be rightly analysed.
The writers tried to analyse the forest fire hazard in Kitami district, Hokkaido.

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Test for Resistance of Air Foam to Destruction by Petroleum Oils at Room Temperature

Tomio IZUMI, Takakage SAKURAI

1955 Volume 5 Issue 1 Pages 25-28
Published: 1955
Released on J-STAGE: February 25, 2015

DOIhttps://doi.org/10.11196/kasai.5.1_25

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A description was given of the performance of tests of resistance of air foam to petroleum oils at room temperature for use in laboratories and in the field, and of the results by the test.

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An Analogous Method of Calculation for the Amounts of Flow of Pipeline-Networks (III)

Jun MIYAMA, Kaoru KITA, Toshihisa USUBA, Yoshio KANAMORI

1955 Volume 5 Issue 1 Pages 29-31
Published: 1955
Released on J-STAGE: February 25, 2015

DOIhttps://doi.org/10.11196/kasai.5.1_29

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An electric network was composed of resistance tubes, having the voltage coefficients K_υ between 1.64 and 1.78 as mentioned in the last paper.
At first the current and the voltage drop of each branch was measured. Then these values were calculated exactly by means of Cross’s method as applied to solving problems of pipeline-networks, utilizing K_υ instead of head loss coefficients.
Errors of experimental values are within 2 percent.

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