水下拖曳体的艉部线型是决定其水动力性能的重要特征之一，良好的艉部线型对减小拖曳体的形状阻力系数，提高拖曳航速，减小拖缆的张力等都有积极意义。选用带十字尾翼的水下拖曳体作为研究对象，应用k-ε模型对其艉部流场特性进行精细分析，分析静压力系数Cp沿拖曳体长度方向的分布，并对水下拖曳体与尾翼交接部上游马蹄涡流动的产生及发展过程进行计算，得出拐角区的流线及流场。计算和实验结果表明，所采用的计算模型和方法合理，可在此基础上应用到其他水下拖曳体的外形优化设计中。%The tail profile of underwater towed body is one of the most significant characteristics that deter-mine its hydrodynamics performance; a decent tail profile could reduce the drag coefficient of the towed body, improving the towing speed, and reducing the towing-cable tension. This paper chooses an underwa-ter towed body with cruciform stern as the research object and applies the analysis of fluid field for the tail, where the pressure coefficient Cp distribution and the resistance along the length of the towed body are giv-en based on k-εmodel. From several aspects, the horseshoe vortex and the development process on the up-stream of handover for the underwater towed body and its tail are presented. The experimental results indi-cates that the proposed methods is reliable and can be used to the profile optimization design of other un-derwater towed bodies.
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