Abstract
To examine the relation between effective wake fraction and propeller thrust loading coefficient, the contraction of flow in front of a propeller due to propeller suction was studied by use of the flow visualization method. It was shown that the rate of the contraction depends mainly upon the propeller thrust loading coefficient and is nearly estimated by the momentum theory.The nominal mean wake was calculated by taking the effect of the contraction of flow into consideration. The remarkable decrease of effective wake fraction with increase of propeller thrust loading coefficient which is normally seen in model test results of full form ship can be explained by the effect of propeller suction.
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