论文标题
一种低阶预测分离和失速在未踩踏翅膀上的方法
A Low-Order Method for Prediction of Separation and Stall on Unswept Wings
论文作者
论文摘要
提出了一种低阶方法，用于对在近台和档后飞行条件下运行的机翼进行空气动力学预测。该方法旨在用于设计，建模和仿真。在这种方法中，摊位引起的流量分离在涡旋晶格框架中建模为室内的有效减少或“ decambering”。对于机翼的每个部分，通过迭代来计算抛物线的decamber膜皮瓣，铰接在截面的分离位置，以确保该部分的提升和矩系数与二维粘性输入曲线的值匹配，以实现该部分的有效攻击角度。作为早期低阶方法的改进，此方法还可以预测机翼上的分离模式。该方法的结果显示，对于具有各种机翼，宽高比，锥度比和小的准稳态滚动速率的无扫机翅膀提出，证明与文献中的实验结果以及作为当前工作的一部分获得的计算解决方案非常吻合。
A low-order method is presented for aerodynamic prediction of wings operating at near-stall and post-stall flight conditions. The method is intended for use in design, modeling, and simulation. In this method, the flow separation due to stall is modeled in a vortex-lattice framework as an effective reduction in the camber, or "decambering." For each section of the wing, a parabolic decambering flap, hinged at the separation location of the section, is calculated through iteration to ensure that the lift and moment coefficients of the section match with the values from the two-dimensional viscous input curves for the effective angle of attack of the section. As an improvement from earlier low-order methods, this method also predicts the separation pattern on the wing. Results from the method, presented for unswept wings having various airfoils, aspect ratios, taper ratios, and small, quasi-steady roll rates, are shown to agree well with experimental results in the literature, and computational solutions obtained as part of the current work.
