潜艇阻力与流场的数值模拟与验证及艇型的数值优化研究

Validation of numerical simulation on resistance and flow field of submarine and numerical optimization of submarine hull form

采用求解RANS方程的数值计算方法,结合k-着、RNGk-着与k-棕三种湍流模型,预报了数值方法验证研究用美国DARPA潜艇模型SUBOFF与CSSRC潜艇模型SM-x的阻力与尾流场,并将计算结果与试验结果进行了对比和分析,验证了数值方法的可靠性。然后,利用数值计算手段,对6条潜艇模型的尾流场进行了比较分析,选出了一条桨盘面不均匀度系数最优的艇型,并对指挥台围壳与尾翼进行了加设弧形填角(填角与附体一体化)的设计,数值预报了填角对于尾流场的影响,从涡量角度探讨了填角处的流动机理,结果表明填角能够改善桨盘面的入流品质。对于“木”字型尾翼的尾流场也进行了数值模拟分析。数值优化手段的可行性得到了验证。

The resistances and flow fields of two hypothetical submarine models DARPA SUBOFF and CSSRC SM-x are numerically simulated by solving RANS equations with k-Ε, RNG k-Ε and k-ω turbulence models. It indicates that numerical implementations are creditable by comparing computed results with experimental data. So the wake fields of six submarine models are predicted to choose a hull form. Then the curved fillets are designed to fit on the fairwater and stern appendages. The effects of fillets on wake fields are predicted and flow mechanism of fillet is studied as viewed from vorticity, results show that fillets can improve the inflow quality in propeller disk.