プロペラ翼断面摩擦抵抗におよぼすスキューの影響

概要

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Effects of propeller skew on propeller blade skin friction drag are studied numerically. Boundary layer equations on non-orthogonal curvilinear coordinate system are solved using Anderson's finite difference scheme successfully. Accuracy of the code is verified with two experimental results. To clarify the effects of skew alone, boundary layer characteristics on rotating skewed flat sectors without pressure gradient are calculated. At the model Reynolds number region the results showed that large skew angle causes three-dimensional separations near mid-chord. Resulting from the wider turbulent region, section skin friction increases significantly. So, frictional torque increase up to 63%. But, no significant effects are predicted at high Reynolds number region. Next, boundary layer characteristics of four propellers having 0, 30, 60 and 90 degree skew are calculated. Analogous results as those for skewed flat sectors are obtained. Estimated amount of defect of propeller open efficiency resulting from skew for a 90 degree skewed propeller at model Reynolds number is near 3%.
2000-09-04