Computation and Analysis of Lateral-directional Dynamic Derivatives of the Near Space Solar Powered Aircraft

摘要

Dynamic derivatives calculation results indicate that, the near space solar powered aircraft differs obviously from conventional low speed aircrafts in the aspect of lateral-directional dynamic derivatives. However, existing methods could not be applied to investigate mechanisms leading to the differences. In order to solve this problem, dynamic derivatives calculation formulas which need only a few general and aerodynamic parameters are derived. The analysis based on the dynamic derivatives calculation formulas suggests that, the configuration with a high aspect ratio wing and the large cruising lift coefficient of the near space solar powered aircraft impact strongly on lateral-directional dynamic derivatives. Derived calculation formulas could be used as a convenient tool for dynamic derivatives calculation and analysis of this kind of aircraft.