CFD在潜艇外形方案比较中的应用

Application CFD to compare submarine hull forms

以水滴型潜艇为母型进行改造,提出了新型椭圆截面和碟形截面的潜艇外形设计。水滴型潜艇的型值选用“大青花鱼”号的简化型值,在船长与排水量不变的条件下通过改变截面形状给出了后两种新艇型的型值,建立了计算模型。采用有限体积法求解不可压缩的雷诺平均(RANS)方程数值模拟了三种艇体周围的粘性流场,通过对三者的粘性绕流和阻力性能的比较,给出了三种方案各自的优缺点。

Finite-volume method solving of incompressible Reynolds-averaged Navier-Stokes （RANS） equations was used for the numerical simulation of three-dimensional viscous flow around submarines in body-fitted coordinate system.The k-ε turhulence model was employed to close the RANS equations.The pressure-velocity coupling was treated with SIMPLEC algorithm.Based upon the shape of water-drop-type submarine, two new submarines with ellipse and dishing cross-sections were developed. On the condition that the length and displacement of vessels remain unchanged, the hull forms of new submarines were designed by changing the shape of cross-sections.With comparing of the resistance performance of the three submarines and viscous flows around them,the advantages and disadvantages of the three types of hull forms are discussed.