Study of the Characteristics of a Coaxial Screw System Placed Within a Guiding Tube

Abstract

Unmanned aerial vehicles (UAVs) are rapidly and significantly evolving in the modern world from a technical perspective. Therefore, it is critically important for the development of their propulsion systems to align with the overall system design, as engines are the primary structural component of any aircraft. This study examines a coaxial screw system placed within a guiding tube that features two independent shafts, differing from traditional and existing coaxial screw systems. During the research, a test rig was designed and constructed, with its schematic shown in Fig. 3. Tests were conducted on this rig, and based on the results, conclusions were drawn regarding the operational regimes in which the coaxial screw system within the tube is most effective. These conclusions and results provide insights into the critical aspects that must be considered for maximizing the positive effects of the propulsion system when applying the coaxial screw system in various aircraft.