The paper presents an over modification multi grid method of the ship propulsion mechanism of Weis Fogh, and obtains the complex potential integral formula by distributing vortices on the wing. The numerical formula i...The paper presents an over modification multi grid method of the ship propulsion mechanism of Weis Fogh, and obtains the complex potential integral formula by distributing vortices on the wing. The numerical formula is given on fine grid and coarse grid. The numerical results show that the algorithm is best when over modification factor is 1.5.展开更多
A Weis-Fogh mechanism wave power generation system is designed, its physical model and mathematical model are discussed, and the component expressions of fluid dynamic expression are derived. Adopting numerical integr...A Weis-Fogh mechanism wave power generation system is designed, its physical model and mathematical model are discussed, and the component expressions of fluid dynamic expression are derived. Adopting numerical integral algorithm, the work done by fluid force acting on wing is calculated.展开更多
The analytical formula and asymptotic formula of added mass of the cascade Weis Fogh mechanism are obtained by applying the complex mapping method.The numerical results show the added mass of cascade is much greater t...The analytical formula and asymptotic formula of added mass of the cascade Weis Fogh mechanism are obtained by applying the complex mapping method.The numerical results show the added mass of cascade is much greater than the one of the plane hydrofoil.展开更多
The influence of leading-edge separation vortias on the WEis-FOOH mechanism for insect hovering is investigsted under the flow upstream. The analysis makes use of a single-vortex model. We establish the motion equatio...The influence of leading-edge separation vortias on the WEis-FOOH mechanism for insect hovering is investigsted under the flow upstream. The analysis makes use of a single-vortex model. We establish the motion equation of the vortex and the initial condition,and confirm that the opening angle 90°is a removable singular Point of the motion equation, and give its asymptotic formula. The numerical results compere reasonably well with observations on a laboratory model at high Renolds number (SPedding 1986) and numerical results show that vortex separation significantly enhances the circulation on each of the wings, the circulation is found to depend on the history of the motion and to increase with a large opening angle, and that the circulation decreases with a large velocity of the flow far upsteam. The conclusions in this paper are helpful to designing new propulsion.展开更多
文摘The paper presents an over modification multi grid method of the ship propulsion mechanism of Weis Fogh, and obtains the complex potential integral formula by distributing vortices on the wing. The numerical formula is given on fine grid and coarse grid. The numerical results show that the algorithm is best when over modification factor is 1.5.
文摘A Weis-Fogh mechanism wave power generation system is designed, its physical model and mathematical model are discussed, and the component expressions of fluid dynamic expression are derived. Adopting numerical integral algorithm, the work done by fluid force acting on wing is calculated.
文摘The analytical formula and asymptotic formula of added mass of the cascade Weis Fogh mechanism are obtained by applying the complex mapping method.The numerical results show the added mass of cascade is much greater than the one of the plane hydrofoil.
文摘The influence of leading-edge separation vortias on the WEis-FOOH mechanism for insect hovering is investigsted under the flow upstream. The analysis makes use of a single-vortex model. We establish the motion equation of the vortex and the initial condition,and confirm that the opening angle 90°is a removable singular Point of the motion equation, and give its asymptotic formula. The numerical results compere reasonably well with observations on a laboratory model at high Renolds number (SPedding 1986) and numerical results show that vortex separation significantly enhances the circulation on each of the wings, the circulation is found to depend on the history of the motion and to increase with a large opening angle, and that the circulation decreases with a large velocity of the flow far upsteam. The conclusions in this paper are helpful to designing new propulsion.
