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Numerical investigation of auto-pitch wing-in-ground effect oscillating foil propulsor

机译：自动间距翼型振动箔推进器的数值研究

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摘要

The propulsive characteristics of auto-pitch wing-in-ground effect oscillating foil propulsors (APWIGs) were numerically investigated through an unsteady Reynolds Averaged Navier-Stokes solver. The kinematics of such a biplane configuration is characterized by the prescribed heave motion and flow-induced pitch motion restrained by a torsional spring for each foil. Based on the validated numerical model, the comparison of propulsive performance between APWIGs and single auto-pitch oscillating foil, as well as dual-foil heave-only configuration, was conducted at different advance speeds. Results show that APWIGs is advantageous in both thrust production and efficiency enhancement over other two configurations due to the resulting wing-in-ground effect and substantial reduction of flow separation by the flow-regulated pitch motion. Furthermore, the effect of torsional spring stiffness on the propulsion of APWIGs was studied under different loaded conditions. It was found that both the maximum pitching angle and phase difference of pitch with heave are dramatically affected by the spring stiffness, which has major contribution to the hydrodynamic behaviours of the foils. Under a certain operating speed, an optimal torsional spring stiffness that produces the best propulsive performance can be found. With respect to the parametric space in the current study, the APWIGs can achieve a constant high efficiency over 70% by employing an appropriate spring stiffness.
机译：通过不稳定的Reynolds平均Navier-Stokes求解器进行数值研究了自动间距翼型振荡箔推进器（APWIGS）的推进特性。这种双飞轴构造的运动学的特征在于规定的升降运动和流动诱导的俯仰运动，由每个箔的扭转弹簧抑制。基于验证的数值模型，在不同的提前速度下进行APWIG和单个自动间距振荡箔之间的推进性能以及双箔升降配置的比较。结果表明，由于由此产生的翼面效应和通过流量调节的音调运动，在其他两个配置上，APWIGS在其他两个配置上具有效率提高的优点。此外，在不同负载条件下研究了扭转弹簧刚度对APWIG的推进的影响。结果发现，通过弹簧刚度显着影响振缩的最大俯仰角和相位差，这对箔的流体动力学行为具有重要贡献。在一定的操作速度下，可以找到产生最佳推进性能的最佳扭转弹簧刚度。关于当前研究中的参数空间，通过采用适当的弹簧刚度，APWIG可以通过70％实现恒定的高效率。

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