The Research On The Principle Of The Increasing Lift Of The Deform Fin Stabilizer And Numerical Calculation

The fin stabilizer is one of the most widely used device for ship roll. For long time, many scientists have done a lot of research and improving on the fin Stabilizer. All of the research and improving can be summarized as two major categories of thought as follow: 1. the improvement of the fin stabilizer control system, Such as the fin angle feedback control and the lift feedback control.2.the improvement of the fin-type. The development of the improvement of the fin stabilizer control system is more sophisticated. But the fin-type improvement is still rare in China, only the similar study on the improvement of airfoil in the aviation field.The thesis is mainly based on the research done by the second study thought, enhancing the anti-rolling capacity by improving the fin-type. Under a certain angle of attack, the lift of fin Stabilizer increases as the increase of the angle of attack. However, when the angle of attack is too large, the fin Stabilizer will stall, and the boundary layer above fin Stabilizer surface flow field will separate, and the lift will decline rapidly, and the resistance increase sharply. in order to increase the fin stabilizer lift coefficient and postpone the arrival of stall angle, in the process of increase of the attack angle, this paper presents two kind way of finstabilizer deformed——the flexible deformation of the front edge and the afteredge, by which fin stabilizer surface flow field distribution is controlled to postpone the separation of the boundary layer. By the knowledge of fluid mechanics, we can see that delay for the fin surface boundary layer separation can improve the fin stabilizer's ability to increasing lift or reducing resistance. So the deform fin Stabilizer at the same angle of attack can produce a greater lift at the same angle of attack as well as improve the stall angle, and enhance the anti-rolling capacity of fin stabilizer. Then calculate and compare the lift coefficient of fin stabilizer before and after deformation by FLUENT to illuminate superiority of the deform fin stabilizer further. Finally the deformation fin stabilizer is loaded into a ship, to simulate the effects of the deform fin stabilizer's anti-rolling.The design of the flexible deformation fin stabilizer, Neither will bring additional equipment or extra power consumption and possess space, and will not cause fluid pollution, just by changing the shape of the fin stabilizer can play a very good effect for increasing lift, which have important research value...