深水密度层航行潜艇兴波阻力的影响分析

Effect of density stratification on wave-making resistance of submarine navigating in deepwater

为探讨密度分层流体中潜艇航行时的受力特性,本文采用基于粘流理论,结合UDF方法建立的用于密度分层流中潜艇水动力特性分析的多相流CFD模型;研究了SUBOFF潜艇模型以不同航速在深水层即内波交界面以下不同位置处航行时的受力特性。研究表明:航速、位置对深水层航行潜艇的受力特性有较大的影响;兴波阻力对总阻力改变有主要贡献;相较于近水面航行,在深水层航行潜艇的兴波阻力系数曲线峰值点向高航速推移;潜艇位置变化影响潜艇表面整体压强分布,而航速变化仅影响潜艇表面拐点处压强。本文给出了密度分层流中以多种工况在深水层中航行潜艇的受力特性,可为密度分层流中潜艇多参数受力分析提供一种有效的分析手段。

This study employs a multiphase flow Computational Fluid Dynamics(CFD)model for submarine hydrodynamic characteristics analyses in a density-stratified fluid based on the theory of viscous flow and the method of User-Defined Function to investigate a submarine′s resistance characteristics in the density-stratified fluid.The resistance characteristics of the SUBOFF submarine model navigating at various speeds and different positions under the internal wave interface were analyzed.The results show that the forward speed and position of a submarine navigating in deepwater significantly impact the resistance characteristics of the submarine.The main contributor to the change in the submarine′s total resistance is the wave-making resistance.Compared to a submarine navigating near the surface,the wave-making resistance coefficient curve of the submarine navigating in deepwater layers exhibits a peak that moves toward a high speed.The change in position affects the overall pressure distribution on the submarine′s surface,in contrast to the variation in the forward speed,which only affects the pressure at the inflection point on the submarine surface.This study shows the resistance characteristics of a submarine navigating in deepwater under different conditions in a density-stratified fluid,which can be adopted to provide an effective method for analyzing the submarine′s resistance considering multiple parameters in the density-stratified fluid.