The force on a slender fish-like body
The force on a slender fish-like body
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DOI：
10.1017/s0022112073002429
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发表时间：
1973-05
影响因子：
3.7
通讯作者：
J. N. Newman
中科院分区：
文献类型：
--
作者：
J. N. Newman
在无粘流动假设下，分析了具有厚度和升力双重作用的鱼状体所受的力。导出了作用在物体上的压力的一般表达式，该表达式类似于经典流体力学中对非升力物体的动量通量分析。对于体积恒定的物体，平均阻力（或推进力）用物体后面的涡片周围的轮廓积分来表示。重点讨论了具有恒定迎角的稳态运动情况，并使用Newman & Wu（1973）提出的细长体近似分析了翅片轴对称体的诱导阻力。与Lighthill（1970）的早期结果不同，这种情况下的升阻比取决于车身厚度。
The force acting on a fish-like body with combined thickness and lifting effects is analysed on the assumption of inviscid flow. A general expression is developed for the pressure force on the body, which is analogous to the momentum-flux analysis for non-lifting bodies in classical hydrodynamics. For bodies with constant volume, the mean drag (or propulsive) force is expressed in terms of a contour integral around the vortex sheet behind the body. Attention is focused on the case of steady-state motion with constant angle of attack, and the induced drag is analysed for finned axisymmetric bodies using the slender-body approximation developed by Newman & Wu (1973). Unlike earlier results of Lighthill (1970), the lift–drag ratio in this case depends on the body thickness.