复合材料螺旋桨非定常流固耦合特性数值分析

Numerical analysis of unsteady fluid-structure interaction of composite marine propellers

针对船用复合材料螺旋桨在非均匀流中的水弹性问题,采用雷诺平均纳维-斯托克斯方法(RANS)和有限元方法(FEM)分别求解螺旋桨流场和结构场,并结合滑移网格和动网格技术,建立了船用复合材料螺旋桨双向瞬态流固耦合计算方法.以DTMB4381桨为对象,采用ANSYS ACP构建复合材料桨有限元模型,计算了正交各向异性碳纤维复合材料(CFP)桨在均匀流场和非均匀流场中的水动力性能和结构响应.研究表明:CFP桨的流固耦合效应较小,在均匀流中具有与刚性桨基本相当的水动力性能;CFP桨在非均匀流中桨叶结构响应(位移、速度和加速度)在高伴流区域、叶梢和导边区域较大,变化也更为剧烈.

Aiming at the hydroelasticity of the composite marine propeller in non-uniform flow,the Reynolds-averaged Navier-Stokes method(RANS)and finite element method(FEM)were used to solve the flow field and structure field of the propeller,respectively.Combined with the slipping mesh technology and dynamic mesh technology,the marine composite propeller bidirectional transient fluid structure interaction(FSI)calculation method was established.The finite element model of the composite propeller was constructed by ANSYS ACP with the geometry of DTMB4381 model propeller.The hydrodynamic performance and structural response of the orthotropic carbon fiber composite propeller(CFP)in uniform flow field and non-uniform flow field were calculated.The results show that CFP presents less FSI effect and almost has the same hydrodynamic performance of the rigid propeller in uniform flow.The structural responses(displacement,velocity and acceleration)of the CFP blade in non-uniform flow are higher at the high wake area,and the places near the blade tip and the leading edge.