Aerodynamic Performance of Ducted Propulsion Systems
Summary
The aerodynamic performance of ducted propulsion systems centres on the integration of a rotor or fan within a cylindrical or annular shroud to control airflow and improve efficiency. By enclosing the disc, ducted configurations can reduce tip vortex losses, suppress noise and enhance thrust characteristics compared with open rotors. The extent of performance gain depends on parameters such as duct profile, blade tip clearance, camber and wall thickness, as well as operational factors including advance ratio and proximity to surfaces. Research has focused on elucidating the interactions between the rotor wake and duct, the contraction and rotation of the slipstream, and the suppression of flow separation under varying inflow conditions. Computational fluid dynamics, semi-analytical modelling and experimental measurements have been employed to optimise design variables, yielding improvements in propulsive efficiency, thrust coefficient and figure of merit. Special attention has been given to emerging electric ducted fan applications for unmanned aerial vehicles and eVTOL platforms, where compactness, safety and noise reduction are paramount. Studies of ground effect reveal complex shifts in blade and duct loading near surfaces, influencing stall behaviour and thrust distribution. Advances in materials, manufacturing and control have further refined performance, enabling ducted systems to play an increasingly important role in both civil and military aviation.
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Aerodynamic Performance of Ducted Propulsion Systems publication trend
The graph below shows the total number of articles in aerodynamic performance of ducted propulsion systems across all publications each year (not limited to Nature Index journals).
Technical terms
Ducted propulsion system: An arrangement where a rotor or fan is enclosed within a shroud to control airflow, reduce losses and improve thrust efficiency.
Tip gap: The clearance between the rotor blade tips and the inner surface of the surrounding duct, which affects leakage and vortex formation.
Figure of merit: A non-dimensional ratio comparing actual power required for hover to the ideal power, used to assess rotor efficiency.
Ground effect: The alteration of aerodynamic forces when a rotor or wing operates close to the ground, typically increasing lift and modifying drag.
Camber: The curvature of an airfoil cross-section, influencing lift distribution and pressure recovery within the duct.
References
- Effects of Duct Cross Section Camber and Thickness on the Performance of Ducted Propulsion Systems for Aeronautical Applications. International Journal of Aerospace Engineering (2016).
- Effect of Electric Ducted Fans Structural Arrangement on Their Performance Characteristics. Applied Sciences (2023).
- Aerodynamic Characteristics of a Ducted Fan Hovering and Transition in Ground Effect. Aerospace (2022).
- Experimental and Numerical Studies on the Effect of Airflow Separation Suppression on Aerodynamic Performance of a Ducted Coaxial Propeller in Hovering. Aerospace (2022).
- CFD Study of an Annular-Ducted Fan Lift System for VTOL Aircraft. Aerospace (2015).
- A Study on Hover Performance of Ducted Fans for an Unmanned VTOL Aircraft. International Journal of Aerospace Engineering (2022).
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