Design and research for a new type buoyancy-lifting row flying-wings

It has important sciencfic and engineering applications for aircrafts of low speed to design the buoyancy-lifting aircraft with both bigger volume and higher aerodynamic efficiency. Based on the aerofoil NACA0030, some aerodynamic configurations of row flying-wings with the higher volume efficiency (volume/surface) were constructed. Different arrayed row flying-wings were calculated and investigated minutely. An aerodynamic configuration of row sweptback flying-wings with the better maneuverability and stability was educed. The numerical simulation results indicate that the lift-drag ratios of row straight flying-wings and row sweptback flying-wings increase by up to 40% and 20%, respectively, and the aerodynamic efficiency of aircrafts are improved obviously from the block of airflow under the anterior flying-wing by the posterior flying-wing. Meanwhile, the chordwise size of buoyancy-lifting row flying-wings is comparatively small so that the surface tension of skin material can be reduced availably. This characteristic provides the wider scope on the skin flexible material selection for high altitude aircrafts.