基于潜艇模型尾流湍流强度和耗散率的CFD模拟

CFD Simulation of the Wake Turbulence Intensity and the Dissipation Rating of a Submarine Model

优良的隐身性能使得潜艇具有强大的突防能力,因此,控制潜艇尾流信号特征对于提高潜艇隐身性能意义重大,这些信号特征主要包括尾部湍流强度、湍动能、湍流耗散率等。同时,优良的艇型对于抑制尾流信号特征、提高潜艇快速性和隐身性也具有重要意义。基于此,采用RANS方法计算SUBOFF潜艇主艇体艇型及6种改良艇型的艇体粘性绕流,将CFD方法用于分析艇体半径、艇艏长度、艇艉长度等参数对潜艇尾流信号特征的影响。计算结果显示:在SUBOFF潜艇主艇体艇型及其6种改良艇型的尾流场中,增加艇体半径有利于抑制远尾流场湍流信号特征,在近场则不利;增加艇艏长度能降低近尾流场湍流信号特征,在远场影响较小;增加艇艉长度在近、远尾流场均有利于降低其信号特征。

Superior stealthiness makes submarines have strong penetration capability,so it is significant to control wake singatures for improving the stealthiness of submarines. Submarine wake singatures include the turbulence intensity, turbulent kinetic energy, and turbulence dissipation rate. Meanwhile,a satisfacto-ry hull form can also restrain the wake singatures of submarines and can greatly improve its speed ability and stealthiness capability. In this paper,the viscous flow fields around SUBOFF and six improved subma-rine hull forms are calculated by using CFD technic RANS methods, based on which the effects of hull radi-us, bow hull length, and stern hull length on the submarine wake signatures are analyzed. The results show that in the wake of the original SUBOFF hull form and that of the modified hull forms, the increasing hull radius reduces the turbulence singatures far field astern, but augments the turbulence singatures close to the hull stern; meanwhile, the increasing bow hull length reduces the wake turbulence singatures close to the hull stern, but has little effect on the turbulence singatures far field astern; plus,the increasing stern hull length can alleviate the wake turbulence singatures significantly.