PROPELLERS WITH DISTORTED INFLOW
PENNSYLVANIA STATE UNIV UNIVERSITY PARK ORDNANCE RESEARCH LAB
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An investigation was made of the steady-state reaction of a propeller to velocity perturbations induced by deflected control surfaces located upstream of the propeller. Theoretically, actuator disk theory is used, first, to represent the control surfaces and introduces a distortion into the flow and, secondly, to represent the action of the propeller when exposed to the distorted flow. The problem is reduced to a boundary value problem by linearizing the equations of motion and the continuity equation and then solved by proper choice of boundary and matching conditions at the actuator disks. The experimental results show that the maximum reactive force of the propeller is abut 34 of the control surface force. This maximum occurs for a 10-bladed propeller with lesser percentages occurring for propellers of 2 and 5 blades. Practically no variation with advance ratio and spacing distance was measured. The theoretical method can easily be extended to the case of a ducted rotating device.
- Fluid Mechanics