An Analysis of Increasing Thrust of an Air Propeller Through Additional Lift Surface
Proceedings of Higher Educational Institutions. Маchine Building(2019)
Abstract
Air propellers used in small scale unmanned aircraft operate at low Reynolds numbers. The aerody-namic force occurring on the blade when the air propeller is in operation is of variable nature. It is observed that for Reynold numbers below 5⋅105 flow separation can occur on some sections of the propeller surface. To deal with the problem, increase the lift on the blade and therefore, reduce the turbulence boundary level, a new design called bi-blade propeller is developed and patented. This design features an additional blade above the main one. Using ANSYS Fluent, samples of the bi-blade propellers were investigated to determine the positions where the inductive resistence and the turbulence boundary level decreased, and the lift increased when the air propeller was in operation. A comparison study was conducted in laboratory conditions to investigate static thrust of the bi-blade propeller on a test bench at 2000–4500 мин–1. The bi-blade propeller was compared with a conventional propeller.
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Key words
air propeller,additional lift surface,thrust
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