考虑变形的螺旋桨水动力及变形特性研究

Study on hydrodynamic and deformation performance of propellers considering the blade deformation

为考虑桨叶变形对螺旋桨水动力性能及变形特性的影响,将面元法与有限元法结合起来,建立了考虑流体结构相互作用的迭代求解算法.水动力的计算采用低阶面元法,而应力与变形分析则采用有限元软件ABAQUS.以DTMB4381～4384桨为计算对象,对不同侧斜螺旋桨的变形特性以及变形后水动力性能进行研究.建立的算法具有较好的收敛性和精度.有侧斜的螺旋桨在工作时其螺距角有减小的趋势,最大位移随着侧斜角的增加而增大;大侧斜螺旋桨的根部和中间部位承受更多载荷,而梢部则更像自由端,随边的应力集中现象也较为严重.

In order to consider the influence of blade deformation on hydrodynamic performance and deformation property of propeller, the panel method and the finite element method were combined to develop iterative algorithm for highly skewed propellers, considering the fluid-structure interaction. A low-order panel method was used to cal-culate the hydrodynamics, and the commercial finite element software ABAQUS was used for deformation and stress analyses. To compare with the experimental results, the of propeller DTMB4381-4384 were taken as the computa-tion object. The deformation characteristic and hydrodynamic performance of propellers with different skew angles were studied. The results show that astringency and precision of the developed coupling algorithm are credible. The existence of skew angles tends to reduce the pitch angle of rotating propellers, however, the maximal blade dis-placement increases with skew angles. As for the highly skewed propellers, more hydrodynamic load was distributed to the root and middle of the blade, the trailing edge was more like a free end whose corresponding stress concentra-tion was severe.