【摘要】 为了探索水下仿生扑翼的推进机理,研究水下扑翼推力及推进效率的特性,建立了二自由度水下扑翼运动模型及水下扑翼推进效率估算方法。采用计算流体力学的方法,利用动网格技术处理运动边界问题,基于Realizable k-ω湍流模型对水下扑翼运动的非定常水动力性能进行了数值计算。通过对多种运动工况下水下扑翼推进性能数值计算的结果分析,阐述了水下扑翼推力产生的机理,得到了扑动频率、上下拍动幅度、翻转幅度等扑翼运动参数对扑翼推力的影响关系,给出了水下扑翼推进效率随运动参数的变化曲线及最佳推进效率点,为水下扑翼推进技术的研究和发展提供了重要参考。更多还原

【Abstract】 Bionic flapping hydrofoil underwater vehicles show obvious advantages over traditional underwater vehicles.One of the key problems in the bionic flapping hydrofoil research is the propulsion performance.Sections 1,2 and 3 of the full paper explain the exploration mentioned in the title.Their core consists of:"The mechanism,the thrust property and propulsive efficiency of the bionic flapping hydrofoil propulsion is investigated by solving numerically the incompressible Navier-Stokes equations in a non-inertial reference frame moving with the rigid foil.First,a 2-DOF motion model of the rigid flapping foil is developed.Then the computational domain was discretized into unstructed grid within the ANSYS ICEM software.Finally,numerical computations of the flapping foil movement under various propulsion conditions were carried out by means of code Fluent.".The computational results,given in Figs.4 through 8,and their analysis demonstrate preliminarily the mechanism of flapping foil,and show preliminarily and quantitatively the relationship between the propulsion performance and the motion parameters,including inflow velocity,flapping frequency,pitch amplitude and heaving amplitude;all these can be used as useful reference in the further research of flapping foil propulsion technology.Section 4 gives some useful conclusions of the full paper.更多还原