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首页> 外文期刊>Journal of marine science and technology >Relation between the lifting surface theory and the lifting line theory in the design of an optimum screw propeller
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Relation between the lifting surface theory and the lifting line theory in the design of an optimum screw propeller

机译：最佳螺旋桨设计中的升力面理论与升力线理论之间的关系

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摘要

A theory on an optimum screw propeller is described. The optimum means optimum efficiency of a propeller, that is, maximizing thrust horse power for a given shaft horse power. The theory is based on the propeller lifting surface theory. Circulation density (lift density) of the blade is determined by the lifting surface theory on a specified condition in general. However, it is shown that, in the case of optimum condition, the circulation density is not determined by the lifting surface theory, although the circulation distribution which is the chordwise integral of the circulation density is determined. The reason is that the governing equation of the optimization by the lifting surface theory is reduced to that by the lifting line theory. This theoretical deduction is the main part of this paper. The importance of the lifting line theory in the design of the optimum propeller is made clear. Numerical calculations support the conclusion from the deduction. This is shown in the case of freely running propellers and in the case of wake adapted propellers.
机译：描述了关于最佳螺旋桨的理论。最佳意味着螺旋桨的最佳效率，即在给定轴马力的情况下最大化推力马力。该理论基于螺旋桨提升面理论。叶片的循环密度（升力密度）通常由升力面理论在特定条件下确定。但是，可以看出，在最佳条件下，尽管确定了作为循环密度的弦向积分的循环分布，但循环表面密度不是由提升面理论来确定的。原因是用提升面理论将优化的控制方程简化为用提升线理论。这一理论推论是本文的主要部分。明确了提升线理论在优化螺旋桨设计中的重要性。数值计算支持推论得出的结论。这在自由运行的螺旋桨和尾流适配螺旋桨的情况下显示。

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