12 April 2004 Study the characteristics of fire under air flow: wavelet analysis
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Abstract
Environments have great influence on the development and propagation of flame during fire disaster. When the fire is under the exertion of air flow, the structure of flame is changed by the air flow. The effect results of air flow depend on its flow parameters, such as velocity and flux. The influence of air flow on fire is one of the important parts in fire dynamics research. Experiment study was conducted to study the structure change of a pool fire under air flows with fixed scale but different velocities. Flame temperature was measured by fine wire thermocouples in different positions of fire. Heat flux gauge was used to measure the change of heat flux. A pair of photoelectric probe measured the fluctuation of flame. The velocity of air flow was measured and all other test data were processed by wavelet transforms. Low frequency components corresponding to stable part of fire and high frequency component with corresponding to unstable part of fire are separated by wavelet analysis. The stable threshold that disappears under a certain velocity of air flow is illustrated by the data process. These results are also compared with those obtained from short time Fourier transforms.
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Qiang Xu, Cong Jin, "Study the characteristics of fire under air flow: wavelet analysis", Proc. SPIE 5439, Independent Component Analyses, Wavelets, Unsupervised Smart Sensors, and Neural Networks II, (12 April 2004); doi: 10.1117/12.540779; https://doi.org/10.1117/12.540779
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