无人战斗机缩比训练机气动特性计算分析

Aerodynamic Performance Computation Analysis of the Subscale UCAV for Training

针对无人战斗机系统维护和飞行训练耗费巨大的问题,借鉴缩比模型验证机飞行试验的思路,研制具有相同飞行性能和操纵特性的缩比训练机。应用相似性原理,通过相似参数分析获得了缩比机与全尺寸原型机的飞行范围。在缩比机几何外形的基础上,应用Gridgen软件创建机体周围流场的非结构网格。通过Fluent软件,计算了缩比机纵向气动特性。根据俯仰力矩系数估算出全机气动中心位置,为缩比机的操纵性稳定性研究和控制率设计奠定了基础。

In order to decrease the maintenance and flight training cost of UCAV, a subscale model for training with the same flight performance and controlling characteristic as full scale prototype vehicle ass developed referring to the flight test of subscale model during the process of aircraft design. According to similar parameters analysis with the similarity theory, the flight alitude of subscale model was compared to the full scale prototype vehicle. The geometry of the subscale model was imported to Gridgen soft to build the flow field around the model with unstructured grid. The longitudinal aero- dynamic performances of the subscale model were computed by Fluent soft. The position of aerodynamic center was esti- mated with pitch moment coefficient data. It prepares for the further work at controllability/stability investigation and con- trol law design.