船艦機庫幾何構型對直升機起降甲板風場結構之影響

During the landing or taking off procedure on the flight deck of frigates, a helicopter might be influenced by the vortex structure caused by the wind passing through the hangar. To study the flow field in the region of flight deck, this research measured the flow field above the flight deck of Simple Frigate Shape (SFS) Models by using particle image velocimetry (PIV) in a circulating water tank. With observing the flow structure of four types of hangar (Base, Corner, Incline, and Chamfer) and analyzing the streamlines, flow speed, vorticity, and turbulence intensity, we can summarize the characteristics of flow structure influenced by the airwake of hangar. Therefore, with taking these conclusions as a basic knowledge, we offer pilots several guidelines to determine the flow structure under different conditions. Furthermore, it can also provide some concepts of flight deck flow field controlling and optimizing when designing the hangar in the future.