非定常拍动翼的水动力性能研究

拍动翼推进方式为水下机器人推进提供了更有效地选择,为了探究拍动翼的水动力性能,采用基于速度势的面元法对非定常拍动翼在特定运动规律下产生的水动力进行了计算,通过与相关实验数据的对比,同时采用计算流体力学FLUENT软件进行了计算并且将结果进行比较,结果的变化趋势一致,最小误差只有11%,充分验证了面元法计算的可靠有效性.通过对拍动翼水动力计算结果的研究,分析了各个运动参数包括来流速度、运动幅值、相位差和运动频率对拍动翼水动力性能的影响.

Hydrodynamic performance of an unsteady flapping foil

The flapping foil propulsion method offers a more efficient choice for underwater vehicle propulsion. To mathematically study the hydrodynamic performances of flapping foils, the panel method was employed, based on potential flow theory. The hydrostatic forces of a flapping foil in specified motion were calculated by panel method using Fortran code. The results calculated by the panel method agreed well with thrust data of MIT experimental. The software Fluent was used to perform the same calculations to verify other dydrodynamic force caculation results by panal method such as lift and moment. The caculation results by panel mathod agreed well with the calculation results by Fluent. They had the similar variation tendency and calculation error was about 10%, verifying that calculating with the panel method was appropriate. Deeper analysis of the calculation methodology allowed the effects of some parameters of hydrodynamic performances to be investigated, including incoming velocity, flap amplitude, phase difference and oscillation frequency.