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扇翼能够通过前缘横流风扇的高速旋转对前方来流进行加速和重新整流。利用这一特点提出了一种串列式扇翼布局,其由一定间距和空间高度分布的前后双排或多排扇翼组成,并基于二维模型对该布局开展了流动数值模拟,分析得到了不同前后间距、高度差以及排数下串列式扇翼布局的升力和推力特性。结果表明,相对单个扇翼,在合适的设计参数下串列式扇翼可得到更大的单排平均升力和推力,其中间距一倍风扇直径的四排扇翼平均升力和推力分别提高了约10%和30%。基于扇翼附近流场分布和翼型上下表面压强分布,分析了引起升力和推力提升的原因。该研究可为未来设计具有更好低速大载荷特性的扇翼飞行器提供参考。
The wings are able to accelerate and re-direct the flow ahead by the high-speed rotation of the leading-edge cross-flow fan. Based on this feature, a tandem-type fan-wing layout is proposed, which consists of two or more rows of front and rear fan blades with a certain spacing and space height distribution. Based on the two-dimensional model, the layout is numerically simulated and analyzed The lift and thrust characteristics of tandem-type wing layout with different front-to-back spacing, altitude difference and row number are obtained. The results show that, compared with a single wing, the tandem wing achieves greater single-row average lift and thrust with suitable design parameters, and the average lift and thrust of the four-row wing with a pitch of one fan increases by about 10% and 30%. Based on the distribution of flow field near the fan wing and the pressure distribution on the upper and lower surfaces of the airfoil, the causes of the lift and thrust increase are analyzed. The research can provide references for the future design of the wing-type aircraft with better low-speed and large-load characteristics.