Chinese Journal of Ship Research
高速船型融合特型球鼻艏的多方案优化设计
12根据下式来估算其活塞运动的固有周期Tn ： ［ ］ d A ( d ) A ( d )κ 0 dz + A ( z) A ( 0)
T = 2π n g
（4） 0式中：A（d）为月池吃水高度d处的开口面积；（ A ）为月池底部开口面积；A（z）为月池高度z处的开口面积；κ为与月池形状有关的系数。6由表 所示的振荡周期结果可知，随着航速的增加，阶梯型月池内流体振荡的周期逐渐偏离其活塞振荡固有周期，但尚未接近晃荡运动固有周期。随着月池内流体运动剧烈程度下降，由月池引起的增阻也大幅降低。
A ( 0)
22（a）后壁底部附近区域的压强往往很大，而在图中可以看出，漩涡水流拍击在切角型月池后倾的切角壁面上，减小了纵向作用分力，月池前、后底部压强分布较均匀，前、后压强差减小，导致切角型月池所受阻力下降。
4结论
CFD本文基于 方法，对带月池的船舶进行了静水阻力与月池流场数值模拟，并结合流场的速度和压力分布特性，分析了月池对船体阻力的影响及机理，同时以阶梯型月池和切角型月池为例验证了两种改进型式月池的减阻效果。主要结论如下： 1）带月池船舶在航行过程中伴随着月池内流体复杂的流动，会耗散船体本身的能量，表现为船舶阻力的大幅增加。发生大幅增长的阻力成分为压差阻力，主要由月池前、后池壁的压力差所引起，与流场内发生的周期性漩涡运动有关。同时，船舶的阻力与航行姿态也发生了同周期的变化。2）阶梯型月池增加了月池自由面附近流体运动的阻尼，切角型月池改善了漩涡在后池壁处的流动与影响，缓解了池内流体运动的剧烈程度，对由月池引起的阻力增加问题有较好的改善作用。3）月池内流体运动的剧烈程度取决于实际［ ［ ］ ［ ，等.黄祥宏，蒋志勇，谷家扬 月池对钻井船阻力性
words：high-speed Key
0引言
水面舰船装备球鼻艏的目的主要是为了安放声呐。随着对声呐性能要求的不断提高，声呐体［Results］积不断增大，用于安放声呐的球鼻艏也趋于大型化。此外，像水滴形球鼻艏这一类的球鼻艏属于超大型附体，并不能起到常规球鼻艏的降阻作用，有时反而会使船舶阻力大幅增加［1-2］。
meet the functional requirements of a special purpose ship，large bulbous bow should be installed at the fore-body as the carrier of special equipment. In order to overcome the adverse ef⁃ fect of large bulbous bow as a special appendage on ship rapidity，the optimal design of high-speed hull form fusion special type bulbous bow was carried out.［Methods］By using the method of gradual approach to analysis，The hull and its appendages were compared and analyzed，the ship with high resistance perfor⁃ mance was selected by numerical simulation，which was verified by model test. The results show that the hull form of round bilge fused cylindrical bulbous ship is a hull form that can meet the layout requirement and has high performance.［Conclusions］Under the same calculation conditions，the numeri⁃ cal simulation can accurately predict the resistance differences among different hull forms，the multi-plan optimization design approach proposed in this paper is an effective method to optimize hull forms. ship；hull form；bulbous bow；rapidity；optimization；numerical simulation