跨介质航行器是一种能在水与空气两种介质中运动的海洋运载装备，具有广阔的海洋探测开发应用前景。本文首先提出了一种利用海上清洁能源供能、由可变形双翼帆驱动的新型可跨介质的无人帆船方案，可自主切换水面、水下、空中三种航态实现对海洋的多环境探测；在水面依靠翼帆驱动航行作为所提出的跨介质无人帆船的主要航态，本文将基于计算流体力学重点分析该航态下并列双翼帆的气动特性与推进性能，包括并列双翼帆的展弦比、锥度比及帆间距等结构参数，攻角、帆向角等控制参数，以及帆间流场干扰对其性能的影响。结果表明：在展弦比取为2～3、锥度比不小于0.6、双帆间距不低于1.5倍翼帆弦长时，并列双翼帆能够获得相对较优的气动推进性能；风向角小于90°时调整翼帆攻角利用升力推进、大于90°时增大翼帆迎流面积利用阻力推进可获得较高推进效率；双帆间流场干扰则主要表现为阻挡效应及梢涡合并，以及由此导致的双帆气动特性的不平衡性。本文研究结果可为所提出的跨介质航行器型线设计及其水面航态航行性能预报提供理论支持。

Hybrid aquatic-aerial vehicle (HAAV) is a kind of marine transportation equipment that can operate in both aquatic and aerial environments, and holds a bright prospect for marine exploration applications. This paper firstly proposes a novel trans-medium unmanned sailboat scheme. The sailboat is driven by deformable wing sails using clean energy from the ocean, which can autonomously switch between surface, underwater, and air modes to enable multi-environment ocean exploration. For the unmanned sailboat, driving on surface by the wing sails is the main navigation mode. Based on Computational Fluid Dynamics (CFD), this paper will focus on analyzing the aerodynamic characteristics and propulsion performance of the parallel dual-wing sails in this mode, including structural parameters, such as aspect ratio, taper ratio and spacing of two wing sails, control parameters, such as attack angles and sail angles, as well as the impact of flow field on the wing sails performance. The results indicate that when aspect ratio is between 2 and 3, taper ratio is not less than 0.6 and spacing of two wing sails is at least 1.5 times the chord length of wing sail, the parallel dual-wing sails can achieve relatively optimal aerodynamic performance. When the wind angle is less than 90°, the wing sails should be adjusted to optimal attack angle to utilize lift for propulsion. Meanwhile, when the wind angle exceeds 90°, the upstream area of wing sails should be increased to use drag for propulsion, then the wing sails can obtain a higher propulsion efficiency. The flow field interference between two wing sails is mainly manifested as blocking effect and tip vortex merging, leading to a serious aerodynamic performance imbalance. The research results can provide theoretical support for profile design of the hybrid aquatic-aerial vehicle and prediction of its surface navigation performance.