부산대학교 도서관

Combustible gas mixtures can be generated in disaster scenarios where small unmanned aerial vehicles are used. In such cases, there exists a potential hazard of ignition of the combustible gas mixture by sparks generated upon the collision of high-speed rotating propellers with protective goggles worn by operators. In this study, fundamental experiments were conducted using an infrared high-speed camera to measure the temperature during the collision between high-speed rotating propellers and protective goggles. The aim of these experiments was to assess the ignition risk of the combustible gas mixture. Based on the temperature measurements of the sparks, we discuss the mechanism of spark generation from the perspective of the heat generated by the main materials of protective goggles and propellers, which are polycarbonate and carbon, respectively. Under the experimental conditions of this study, the measured temperature of the sparks generated surpassed the autoignition temperature of gasoline, indicating an ignition risk.