Experimental Study on the Smoke-Logging Phenomenon Owing to Sprinkler Operation During Initial Fire

This study establishes basic data for the reasonable evaluation of evacuation safety and investigates the smoke-logging phenomenon owing to the operation of sprinklers during the initial fire. The spray droplet characteristics of a sprinkler and water mist head were examined, and the descending air current of the smoke layer was analyzed according to the type of fire source (ethanol, polyurethane) and head. A regression equation based on the findings was derived using the prediction equation for the descending air current of the smoke layer presented in a previous study.