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Title: Flame Characteristics of a Rotating Pool Fire // Proceedings of the Ninth International Seminar on Fire and Explosion Hazards. Vol. 1: 21-26 April 2019, Saint Petersburg, Russia
Creators: Sugawa O.; Kamiya K.; Watanabe N.
Organization: Suwa University of Science
Imprint: Saint Petersburg, 2019
Collection: Общая коллекция
Document type: Article, report
File type: PDF
Language: English
Links: http://doi.org/10.18720/SPBPU/2/k19-58
Rights: Свободный доступ из сети Интернет (чтение, печать, копирование)

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Tangential air flow can generate a fire whirl characterized by unique flame shapes that extend upwards. In this work, the temperature profiles along the centre axes of fire whirl flames were obtained using a series of thermocouples. A circular fire source and a varying number of polycarbonate guide plates were set on a turntable, which was rotated clockwise or anticlockwise. The rotation rate ranged from -90 (anticlockwise) to +150 rpm (clockwise). In trials without guide plates, the flame height increased along with the rotation rate except for slow rotation in the range of 0 to +30 rpm, during which precessional movements were observed. With guide plates, the heat release rate increased with increases in the rotation from 0 to -90 rpm, and the data strongly suggest that the heat release rate was proportional to the degree of air circulation. Over the rotation range of -60 to -70 rpm and with guide plates the fire whirl changed from a slender flame shape to a thick tubular morphology having an eye wall. The excess temperatures, DT, along the centre axis of a flame produced with guide plates indicated the absence of an intermittent flame region, which is typically observed in free burning flames. The behaviour of this flame was therefore significantly different from that of a general pool fire.

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