Abstract
To clarify the effects of wake contraction, swirl velocity and mutual interactions on the cruising performances of a counter rotating propellers ATP, fundamental analyses based on the generalized momentum theory were carried out. Assuming a linear interaction scheme, the optimum propulsion efficiency and the wake geometry which minimize the total induced losses for a given thrust were established as solutions of a calculus of variations problem. The optimum combinations of operating parameters such as the thrust sharing ratio, the power sharing ratio and the disc area ratio between top and bottom propellers were also specified and their dependency upon the axial velocity, the total thrust level and the axial spacing were revealed. It was understood that, in addition to the counter rotating effect of propellers, upwash effect of the contracted top propeller wake on the outer part of the bottom propeller disc play a fundamental role for improving the propulsion efficiency of a CR ATP.
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