水下尾翼对舰船阻力性能的影响研究

Research on the impact of underwater stern foil on the ship resistance performance

为了研究水下尾翼对高速舰船阻力性能的优化效果,本文对DTMB 5415舰进行全航速段(Fr=0.05-0.45)加装水下尾翼前后的数值研究。探讨四种展长尾翼对船舶阻力性能的影响,并根据数值计算结果对水下尾翼的减阻机理进行研究。计算结果表明:当Fr=0.25-0.45时,DTMB 5415船模安装水下尾翼的减阻效果明显,最高减阻率达7.443%;展长为L2的水下尾翼在船舶巡航速度附近(Fr=0.25-0.35)的减阻性能最好,平均减阻率为5.423%;尾翼受力的贡献是加装水下尾翼船模总阻力增额的主要来源,占比达56.8%。此外,通过分析翼型表面压力分布发现,尾翼展长过大时,会在尾翼两端附近下表面形成低压区,同时增强翼型前端的高压区,影响尾翼的减阻性能。本文所得结论可以为船舶水下尾翼展长选取提供参考。

In order to study the optimizing effects of underwater stern foils on the resistance performance of high-speed ships, a numerical study of DTMB 5415 before and after the addition of an underwater stern foil at all speed(Fr=0.05-0.45) was carried out. The influence of four foils with different lengths on ship resistance performance was discussed, and the drag reduction mechanism of the underwater stern foil was studied based on the numerical calculation results. The calculation results show that when Fr=0.25-0.45, the drag reduction effect of the underwater stern foil of the DTMB 5415 ship model is obvious, the highest drag reduction rate is 7.443%;The underwater stern foil with length of L2has the best drag reduction performance near the cruising speed of the ship(Fr=0.25-0.35), with an average drag reduction rate of 5.423%;The contribution of the stern foil force is the main source of the total resistance increase of the ship model equipped with the underwater stern foil, accounting for 56.8%. In addition, by analyzing the surface pressure distribution of stern foils, it was found that when the length of stern foil is too long, a low pressure area will be formed on the lower surface near the ends of the stern foil, and the high pressure area at the front end of the foil will be enhanced, which will affect the drag reduction performance of the stern foil. The conclusions obtained in this paper can provide a reference for the selection of the lengths of underwater stern foils of ships.