Research on aerodynamic configuration design principle for advanced hypersonic vehicle

The contradiction between the higher performance and the humble controllability becomes more and more serious as higher and higher flight performance is required, the traditional three-axis static stability principle is not appropriate to the configuration design for new generation hypersonic vehicle, whose flight performance requirement will exasperate the control performance. It is necessary to explore a new configuration design principle, which expands the available design space and creates possibilities for higher performance hypersonic vehicle. In the new method, the lateral and directional performance is dealt with as a unity. From the overseas experience, Cn_β-dyn (Dynamic Directional Stability Parameter) and LCDP (Lateral Control Departure Parameter) can be used to classify the open-loop and close-loop lateral-directional model characteristic well and truly, which can be adopted as the advanced criterion for aerodynamic configuration design. According to the combination of Cn_β-dyn and LCDP, three typical states of a certain hypersonic vehicle are research objects, and open-loop mode characteristic and close-loop mode characteristic for six kinds of feedback performance are investigated with root locus method in this paper. Elementary result shows the controllability and close-loop feedback characteristic are closely connected with different areas divided by these two combination parameters, and Cn_β-dyn and LCDP parameter can be used as the aerodynamic configuration design criterion.