风浪作用下船体纵摇运动对螺旋桨激振力特性影响分析  

Influence of Hull Pitch Motion in Wind and Waves on Exciting Force of Propeller

作　　者：李亮[1,2] 刘登成 洪方文[1,2] 郑巢生 LI Liang;LIU Dengcheng;HONG Fangwen;ZHENG Chaosheng(National Key Laboratory on Ship Vibration&Noise,China Ship Scientific Research Center,Wuxi 214082,China;Jiangsu Key Laboratory of Green Ship Technology,Wuxi 214082,China)

机构地区：[1]中国船舶科学研究中心船舶振动噪声重点实验室,无锡214082 [2]江苏省绿色船舶技术重点实验室,无锡214082

出　　处：《中国造船》2020年第2期1-13,共13页Shipbuilding of China

摘　　要：大型高速船舶在风浪中航行时会发生摇荡,导致推进效率下降,还会引发严重的螺旋桨激振力。以KCS船和KP505螺旋桨为研究对象,采用RANS方法和重叠网格技术,对无船体纵摇运动和有船体纵摇运动下的船-桨-舵系统开展了水动力数值计算分析。计算结果显示,在纵摇运动下桨盘面处标称流场的空间不均匀度基本上和无纵摇运动相当,但流场的时间不均匀度急剧增加。同时,在船体纵摇运动情况下船体阻力时均值大幅增加、螺旋桨推力时均值大幅减小。对螺旋桨水动力时域信号进行快速傅里叶分析,发现在纵摇运动时螺旋桨非定常力频谱中的峰值更加丰富,在所有峰值中以纵摇运动频率处的峰值为最大,且远大于叶频处的峰值,它随纵摇运动幅值的增大而升高。Numerical calculation was performed for the KCS ship and KP505 propeller in the condition without or with pitch motion.Reynolds-Averaged Navier-Stokes(RANS)method and the overset grid are adopted.Calculation results show that the space non-uniformity of nominal wake on the disk plane with pitch motion is comparable to that without pitching motion.However,time non-uniformity increases sharply.Time average value of the hull resistance increases enormously and time average value of the propeller thrust decreases a lot due to the pitch motion.More peaks appear on the spectrum of the exciting force when considering pitch motion,and the peak at the frequency of the pitch motion is the highest among all peaks and increases with the motion amplitude.

关 键 词：纵摇运动 螺旋桨激振力 船-桨-舵系统 流场不均匀度 

分 类 号：U661.43[交通运输工程—船舶及航道工程]