Unsteady Aerodynamic Model Based on the Leading-Edge Stagnation Point

作者：Suryakumar Vishvas S^*; Babbar Yogesh; Strganac Thomas W; Mangalam Arun S

来源：Journal of Aircraft, 2016, 53(6): 1626-1637.

DOI：10.2514/1.C033602

The significance of the leading-edge stagnation point as an unsteady aerodynamic observable is investigated. Using first-order unsteady potential flow theory, a simple model relating the stagnation point to the unsteady lift is derived for an airfoil undergoing arbitrary unsteady maneuvers. In particular, the dynamic circulatory effects are shown to be accounted for by tracking the stagnation point. Linearization permits the superposition of solutions for thickness and camber. The model is validated using numerical simulations, employing both steady and unsteady panel methods. In addition, its validity is investigated experimentally through steady and unsteady wind-tunnel tests of a wing section. The stagnation point is estimated in real time from the convective heat transfer distribution measured using a hot-film sensor array instrumented around the wing's leading edge. Applications of these findings to flutter suppression and gust-load alleviation are experimentally demonstrated.

• 出版日期2016-11