Design and Analysis of Canard Configurations with Adjustable Longitudinal Static Stability Margin

The position relationship between aerodynamic center and center of mass, i.e. the static stability margin, is an important parameter in the development and use of aircraft. In order to realize real-time adjustment of reasonable static stability margin during flight, three forms of morphing canard were proposed, namely variable sweep canard, stretch canard and slide canard. The aerodynamic center position adjustment ability of three morphing canard forms in a wide speed range was studied by computational fluid dynamics simulation. The results show that the three forms have effective aerodynamic center position adjustment ability. Within the range of studied parameters, the variable sweep canard has the strongest aerodynamic center adjustment ability in the subsonic region. The stretch canard has a relatively strong ability to adjust the aerodynamic center position in transonic and supersonic regions. The slide canard has the strongest aerodynamic center position adjustment ability in the hypersonic region. The analysis shows that the variable sweep canard has the most engineering value among the three forms.