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Propeller system with two counter-rotating propellers, a method for measuring the thrust of a propeller system with two counter-rotating propellers and wind tunnel with a model positioned therein having a propeller system
Propeller system with two counter-rotating propellers, a method for measuring the thrust of a propeller system with two counter-rotating propellers and wind tunnel with a model positioned therein having a propeller system
A propeller system with two propellers, arranged one behind the other and separated by a propeller gap, respectively comprising a propeller hub and at least one rotating force measuring device, comprises at least two differential pressure sensors and an evaluation unit. The rotating force measuring devices are mechanically connected to the respective propellers and are adapted for determining the individual thrust force of each propeller. At least one of the said differential pressure sensors is arranged on or in each propeller and is adapted for measuring a differential pressure between the propeller gap and the respectively opposing side of the propeller. By adding the measured individual thrust forces and by subtracting the gap area forces that are based on the respectively measured differential pressures, the evaluation unit can determine a precise overall thrust force for the propeller system.
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