The concept of aspect ratio comes from the rudder and wing design. In this paper, the aspect ratio of a vertical-type submarine sail is defined as the ratio of width to height of its projection area in the abeam direction. Under the condition that the projection area in the abeam direction is constant, we mainly analyzed the influence of several different aspect ratios on the acoustic target strength(TS) of the submarine sail. Combined with the finite element method(FEM) and planar element method(PEM), the TS of several submarine sails with the increasing aspect ratio is calculated. From the obtained numerical results, it can be find that the TS of a submarine sail is insensitive to the aspect ratio in our considered frequency range, generally, a larger aspect ratio is helpful to reduce the TS of submarine sail. With these conclusions, a submarine sail can be better designed for the acoustic stealth performance.
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