A surface ship on the ocean can excite the Kelvin wave behind it, an underwater moving-body in the stratified ocean can generate the internal wave traveling with it, and the internal wave can propagate from the underwater to the ocean surface. However, there are some important differences between the internal wave and the Kelvin wave,and a special difference is the value of wavetrail angle. People abound in the knowledge of Kelvin wave (for example, the Kelvin wave angle is always 19.5°), but the studying for the internal wave has been developing. Based on the work done before, a simple straightforward method to predict the region of internal-wave angle and some explanation were presented.%水下潜航体在分层海水中兴起内波,这与水面船在海面兴起的Kelvin波并不一样.其中一个具体的区别是两类波迹的夹角大小.对Kelvin波的研究已相当成熟,对内波的研究正方兴未艾.本文是有关内波系列研究工作的一部分,采用一种简单而直截了当的计算方法,分近、远场具体计算出水下潜航体在海中兴起的内波夹角大小和范围.
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