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中文摘要：
为了研究凸台对多载荷AUV载荷段的阻力影响,基于SST k-ω湍流模型,分别对原始模型和带凸台结构模型进行了流场的数值计算。通过分析凸台截面形状及尺寸对流场的影响,研究了凸台减阻机理。结果表明,尾部凸台的出现能够避免过早的发生流体分离,降低模型尾部形成的尾涡强度和尺度,从而减小模型的压差阻力,达到减阻效果。并且,圆柱形凸台的减阻效果并不是随着尾部凸台的直径和长度增加而单调增加,而是有一个较合适的直径及长度进行匹配,从而达到最佳的减阻效果;半球形凸台对模型减阻效果很好,但在一定范围内减阻效果不随直径的增加而增强;组合型凸台的减阻效果比单纯圆柱形凸台和半球形凸台都要好,减阻量可以达到50%以上。
英文摘要：
After the separation of multi-load AUV, AUV becomes into two parts： load and carrier. Separation destroyed the original shape with good hydrodynamic characteristics of AUV. How to reduce the drag of load has great significance on the separation of multi-load AUV. In order to study the influence of appendage of multi-load AUV on friction, the numerical calculations on original and modified models with different kinds of appendages are carried out based on the SST k-ω turbulence model. The results show that the appendage can avoid the phenomenon of fluid premature separation, so as to reduce the intensity and scale of the wake vortex, and achieves drag reduction effect by reducing pressure friction. Conclusions are drawn as：（1） Cylindrical appendage should have a suitable diameter and length to be matched, in order to achieve the best drag reduction effect;（2） The drag reduction effect of hemispherical appendage is good,but the drag reduction effect is not enhanced with increasing diameter within a certain range;（3） Drag reduction effect of the combination appendage is better than the simple cylindrical and hemispherical appendage, and the amount of drag reduction can reach 50%.
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