Fire Safety Science Digital Archive

Deterioration of visibility during fire fighting occurred after water injection is a problem in the development of a pneumatic nozzle system. A series of experiments had been carried out to investigate the effect of the water injection on the temperature field in a test enclosure. The process of the deterioration of visibility was recorded with video and infrared cameras. The deterioration of visibility occurred before the cooling of the hot zone in the enclosure. The movement of the smoke layer in the enclosure was determined by processing the recorded video images. The volumetric increase of the smoke layer was estimated with the obtained movement of the smoke layer.