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柔性螺旋桨非定常流场及结构动态响应数值计算 预览

Numerical investigation of the unsteady flow and structural dynamics of a flexible propeller
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摘要 为了研究柔性材料螺旋桨的非定常流场特性和结构振动响应,本文采用非定常CFD/FEM流固耦合方法,对均匀来流下各向同性材料柔性螺旋桨的动态特性进行了数值计算。分析了流场非定常波动量和结构振动响应之间的关系,明确了柔性叶片振动特性和流固耦合的机理。结果表明:非定常梢涡的生成与耗散对流场的波动影响较大,而相较流场负载波动,叶片前两阶湿模态频率对结构振动影响更大;柔性桨的推力波动可分解为受静压变形后的刚性桨所产生的推力与高阶频率的流场压力波动的叠加,而在均匀来流中后者数值不大,因此使用稳态流固耦合方法求解柔性桨的敞水性能是合适的。 To study the unsteady flow field and structural vibration response of flexible propellers,we used the unsteady computational fluid dynamics(CFD)/finite element method(FEM)coupling method to calculate the dynamic characteristics of the isotropic flexible propeller in uniform flow.We then analyzed the relationship between the unsteady fluctuation and the structural vibration response.In this paper,we present the vibration characteristics of the flexible blade and the mechanism of the flow field coupling.The results show that the generation and dissipation of the unsteady vortex greatly influence the fluctuation of the flow field and the flow field load.Compared with the load fluctuation of hydrodynamic pressure,we found the first two-stage wet-mode frequency of the blade to have a greater influence on the structural vibration.Our results show that the thrust fluctuation of the flexible propeller can be regarded as the superposition of the thrust generated by the static-pressure deformation of the rigid propeller and the fluctuation of flow-field pressure of high-order frequency.In contrast,in uniform flow,the high-order frequency aspect is negligible.As such,it is suitable to use the steady-state fluid-solid coupling method to solve for the open-water performance of the flexible propeller.
作者 丁永乐 宋保维 王鹏 DING Yongle;SONG Baowei;WANG Peng(School of Marine Science and Technology,Northwestern Polytechnical University,Xi'an 710072,China)
出处 《哈尔滨工程大学学报》 EI CAS CSCD 北大核心 2019年第3期456-461,共6页 Journal of Harbin Engineering University
基金 国家自然科学基金项目(51375389).
关键词 柔性结构 螺旋桨 流固耦合 动态响应 计算流体力学 有限元分析 非定常流场 结构振动 fluid structure propellers fluid-solid coupling dynamic response computational fluid dynamics finite element method unsteady flow field structural vibration
作者简介 通信作者:丁永乐,男,博士研究生,E-mail:jerryd2014@163.com;宋保维,男,教授,博士生导师;王鹏,男,教授,博士生导师。
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