一种联结翼布局气动特性的求解模型

联结翼布局与常规布局相比具有结构重量轻、诱导阻力小、升力系数大和稳定性良好的特点。从升力线理论出发,引入普朗特对干扰因子的假设,推导出适合于平列式联结翼布局的气动求解模型,并给出了干扰因子的取值范围。该模型保持了工程估算方法所具有的简单、快捷的优势,与计算流体力学(CFD)计算结果的对比显示,模型具有较好的精度。研究结果表明,在机翼面积不变的情况下,增大前翼展弦比、展长比及翼隔可有效降低总诱导阻力,与单翼布局相比诱导阻力最大可降低28%。

Solution Model for Aerodynamic Characteristics of Joined-wing Configuration

The joined-wing configuration, as compared with the normal configuration, is characterized by low structural weight, small induced drag, big lift coefficient and good stability. Starting from the lifting line theory and introducing Prandtl assumption of interference factor, this article derives an aerodynamic solution model for parallel joined-wing layout, and provides the value range of its interference factor. This model retains the advantages of engineering estimation in simplicity and rapidity, and a comparison with the calculation results of computational fluid dynamics (CFD) indicates that the precision of this model is preferable. The results show that an increase of aspect ratio, span ratio and space of the front wing, while keeping the wing area invariable, could reduce the total induced drag effectively. The induced drag is reduced by 28% as compared with the single-wing configuration.