선박 기관구역 내의 연기거동에 대한 수치해석 연구

Abstract

In the wake of the sinking of Fishing Vessel Dae-Seong due to fire accident in Jeju(November 19, 2019), the government mandated the installation of fire alarm devices for fishing vessels, distress buttons in the crew's room, and prepared measures to prevent and reduce fishing vessel accidents (November 25, 2019). This study aims to analyze and predict the effect of the design standard and regulations applied to the ventilation system in the machinery space for T/S KAYA on the smoke behavior in case of an initial fire. The effect of air flow field and shape on smoke behavior was studied through numerical simulation using commercial code Ansys-CFX. The continuous equation, the momentum equation, and the energy equation were used for numerical analysis, and the most engineering model was applied to simulate turbulent flow. The steady state analysis was performed on the air flow field according to the blower operation, and the initial value was applied to the transient state to analyze the smoke flow, and the transient state analysis was performed for 60 seconds at 0.01 second intervals. Ventilation system design and smoke detector installation guidelines and analysis results were reflected, and the exhaust fan No.3 was removed, and 50% of the total air volume in the engine room was concentrated near the main engine, the starboard S10 duct was removed, and the re-designed funnel louver(1.3mX1.5m) was applied to improve the system. In order to compare with the point of the maximum separation distance from the bulkhead(Point01), the maximum point of the CO2 mass concentration on the X-Y Plane (Z=8.8m) was analyzed and compared with the Point02 point, and the smoke concentration was analyzed 5.47 times higher on average.