Analysis of influence of D-cylinder on hydrodynamic performance of flapping hydrofoil
In order to study the influence mechanism of the D-cylinder on the hydrodynamic performance of the flapping hydrofoil,the hydrodynamic performance of the flapping hydrofoil in the uniform flow field and D-cylinder wake field was calculated based on computational fluid dynamics(CFD)method and Fluent's dynamic mesh technology.By changing the flapping frequency and heave amplitude of the flapping hydrofoil,the propulsion performance of the flapping hydrofoil under the uniform flow field and the D-cylinder wake field was calculated,and the pressure distribution contour and vortex structure of the flow field were analyzed.The results show that the increase of flapping frequency and heave amplitude can increase the average thrust of the flapping hydrofoil.The average thrust of the flapping hydrofoil in the D-cylinder wake field is always greater than that of the flapping hydrofoil in the uniform flow field.The shedding vortex of the D-cylinder compresses with the leading edge vortex of the flapping hydrofoil,so that the trailing vortex area of the flapping hydrofoil is enlarged,the shedding vortex dissipates faster,and the inducing effect between the vortex pairs is stronger to generate greater thrust.
万方数据
维普
