摘要
针对极地船舶在冰区航行时的冰水混合环境对螺旋桨性能影响,本文采用RANS方法对不同冰块阻塞和压力状态的螺旋桨非定常空泡和水动力性能进行数值模拟,分析了冰块阻塞状态对螺旋桨空泡激振力的影响规律。结果表明,冰块阻塞状态的螺旋桨水动力性能由冰桨逼近的流场阻塞和桨叶空泡效应共同决定,冰阻塞物下游产生的低速低压回流区可改变螺旋桨附近流场结构和压力场分布,加剧桨叶空泡形态的不规则和螺旋桨空泡激振力的时域非定常性。从频域上看,冰桨阻塞作用造成螺旋桨空泡激振力的高阶量显著上升,空泡激振频率向高阶次移动。
According to the influence of ice-water mixed environment on propeller performance for polar ship navigation in ice area,numerical simulation of unsteady cavitation and hydrodynamic performance of propeller in different ice block and pressure condition is carried out by RANS method.The effects of different ice block condition on cavitation excited force of propeller are analyzed.Results show that hydrodynamic performance of propeller in ice block condition is determined by ice blockage flow field and blade cavitation effect.A low speed and pressure recirculation zone generated downstream of blockage changes flow field structure and pressure distribution nearby propeller,which increases the irregularity of blade cavitation behavior and unsteadiness of propeller cavitation excited force in time domain.In frequency domain,ice block effect increases the higher order value of propeller cavitation excited force,and moves cavitation excited frequency to higher order.
作者
武珅
芮伟
曾志波
WU Shen;RUI Wei;ZENG Zhi-bo(China Ship Scientific Research Center,National Key Laboratory on Ship Vibration and Noise,Jiangsu Province Key Laboratory of Green Ship,Wuxi 214082,China)
出处
《舰船科学技术》
北大核心
2019年第19期21-26,共6页
Ship Science and Technology
基金
江苏省自然科学基金资助项目(BK20160200)
国防基础科研计划资助项目(JCKY2016604B001)
关键词
螺旋桨
冰阻塞状态
空泡激振力
数值模拟
propeller
ice block condition
cavitation excited force
numerical simulation
