Abstract
Computational analysis of several ducted rotor systems is performed to determine the effect of rotor inflow on thrust generation in hover and axial flight. An outboard-biased rotor inflow has been shown to increase the performance of a hovering ducted rotor system. The duct-rotor aerodynamic interactions and their resulting effects on rotor inflow are studied to provide insights on duct-rotor design. Multiple duct-rotor configurations are studied using high-fidelity CFD in hover and axial flight for various twist distributions and increasing rotor collective values. Performance and efficiency gains are shown for multiple duct-rotor configurations in hover. Rotor inflow calculations show an outboard bias that allows rotors to be operated more efficiently for a range of collective angles. Benefits of outboard-biased rotor inflow in axial flight for a fixed collective were minimal. This analysis shows the extent to which performance and efficiency benefits are achieved for a ducted rotor based on the behavior of rotor inflow.
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