콴다 효과를 적용한 고정식 핀 안정기의 양력 성능에 관한 연구

초록

A ship operating in rough sea may suffer from an undesirable motion which may severely degrade the performance of equipment onboard and givea person an uncomfortable feeling. Hence, Roll stabilization received a considerable attention and various devices including bilge keels, stabilizing fins,gyroscopic, tanks, rudders and flaps have been conceived and utilized for the purpose. The Coanda effect is evident when a jet stream is appliedtangential to a curved surface of a hydrofoil since then the jet increases the circulation around the foil and accordingly the lift. Model tests andNumerical simulation have been conducted to examine the practicality of a fixed type fin stabilizer augmented by the Coanda jet. The results showthat the lift coefficient of the modified Coanda fin at the zero angle of attack α identically coincides with that of the original fin at α = 26° whenCoanda jet is supplied at the rate of Cj=0.1. It is also shown that fixed type fin stabilizers to actively control the motion of ships and the other mobileunits without variation in the angle of attack can be put to practical use if the Coanda effect is applied.