ON THE AERODYNAMIC DESIGN OF PROPELLERS AND DUCT SYSTEMS FOR GROUND EFFECT VEHICLES
TL;DRAbstract
An analytical and experimental investigation was performed to establish design methods for propeller and duct systems operating in ground effect. Methods are formulated for the calculation of propeller-in-duct performance. A simple analysis is made of the effect of exit nozzle velocity distribution and it is found that a constant nozzle velocity results in a maximum lift to power ratio. A qualitative analysis is made also of the duct efficiency. The similarity parameters of ground effect machines are determined. The effect of various geometric and operational parameters on the internal performance of propeller-duct systems in the proximity of the ground were studied. Maximum over-all internal efficiencies of 78% for an axially symmetric ducting system and 68% for a curved duct system were obtained.
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An analytical and experimental investigation was performed to establish design methods for propeller and duct systems operating in ground effect. Methods are formulated for the calculation of propeller-in-duct performance. A simple analysis is made of the effect of exit nozzle velocity distribution and it is found that a constant nozzle velocity results in a maximum lift to power ratio. A qualitative analysis is made also of the duct efficiency. The similarity parameters of ground effect machines are determined. The effect of various geometric and operational parameters on the internal performance of propeller-duct systems in the proximity of the ground were studied. Maximum over-all internal efficiencies of 78% for an axially symmetric ducting system and 68% for a curved duct system were obtained.
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