潜艇尾流尺度的计算

CALCULATION OF WAKE SHAPE AND SIZE A SUBMARINE

在综合Ｍｅｒｒｉｔ等人对潜艇尾流实验研究的基础上，给出了潜艇尾流尺度的计算方法及典型算例结果。在稳定层化海洋中，潜艇尾流以圆锥形增长；在非层化海洋中，初期尾流也以圆锥形增长，但在浮力作用下，尾流垂向增长崩溃，然后以又薄又宽的近于矩形截面增长，最后垂向尺度趋于常值。对尾流影响最重要的参数是付汝德数和Ｂｒｕｎｔ－Ｖａｉｓａｌａ 周期。

Based on experimental exploration made by Merritt etc. a method is developed to determined the wake shape and size of a submarine. The calculation results of some examples are given. In the unstratified case, the cake cross section at any point is circular. When the flow is stratified, buoyancy cause the wake, which initially grows at the same rate in all directions, to collapse in the vertical direction and flatten out horizontally producing a very wide and thin rectangular shape. The important parameters affecting the wake are Froude number and Brunt Vaisala.