aerodynamics

This article investigates the aerodynamic behavior and efficiency of swirled air jets used in modern ventilation systems. The influence of rotational motion on turbulence intensity, mixing efficiency, and air distribution uniformity is assessed. Results confirm that swirled jets enhance air mixing and reduce axial velocity and temperature gradients more effectively than traditional non-swirled jets. Key dimensionless parameters, such as velocity and temperature attenuation coefficients, are introduced to simplify calculations.

The study examines the velocity decay processes in an isothermal free swirled air jet to improve methods for controlling the aerodynamic characteristics of air flows. The objective is to intensify the velocity decay in the supply air of an isothermal free swirling jet, determine the decay coefficient, and analyze axial velocities by constructing their profiles in cross-sections. To simplify calculations, the velocity decay coefficient “m” is introduced.

This article presents a comprehensive analysis of hybrid unmanned aerial vehicles (UAVs) equipped with ducted and asymmetric propellers. The results of experimental studies confirm the advantages of using these types of propellers regarding aerodynamic efficiency, energy efficiency, noise reduction, and improved maneuverability. The possibility of combining asymmetric propellers with ducted designs, as well as their impact on thrust, flight stability, and other flight characteristics of drones, is examined in detail.