Transactions of Nanjing University of Aeronautics & Astronautics
Numerical Study on Influence of Key Parameters of Aerodynamic Characteristics of Shaftless Ducted Rotor
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Abstract:
Shaftless ducted rotor （SDR） is a new type of ducted rotor system designed with ducted-rotor-motor integration， which is quite different from traditional ducted rotor （DR） in aerodynamic characteristics. The sliding mesh based on unstructured grid is used to simulate the aerodynamic characteristics of SDR and DR. Then， the effects of five key parameters， namely， the rotor disk height， the number of blades， the spread angle of the duct， the central hole radius and the ducted lip radius on the aerodynamic characteristics of the SDR are investigated. It is found that the same-sized SDR produces a larger total lift than the DR in hovering， but the lift proportion of its duct is reduced. In the forward flight， a large low-speed region is generated behind the SDR duct， and the reflux vortex in blade root above the advancing blade has the trend for inward diffusion. The rotor disk height has similar effects on SDR and DR. Increasing the number of blades can effectively increase the total lift of SDR， which also increases the lift proportion of duct. Increasing the spread angle of the duct will lead to the rotor lift coefficient decrease， reducing the central hole radius can increase the total lift， but the component lift coefficient decreases. Appropriately increasing the ducted lip radius can increase the total lift， which begins to decrease after reaching a certain value.
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V211.3
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