【作者】 李航；

【导师】 余龙；

【作者基本信息】 上海交通大学 ， 船舶与海洋工程， 2017， 硕士

【摘要】 本文对一种新概念船舶节能装置进行了研究,在船舶的螺旋桨后部布置一个海流发电机,利用螺旋桨的尾流推动发电机叶轮的旋转,从而带动发电机组发电。本文从设计方法和性能计算的角度出发,研究螺旋桨和桨后发电机的一体化设计方法,以常规螺旋桨和海流发电机的形式为基础,分别进行优化,从而获得由二者构成的组合式推进器。本文首先分别研究螺旋桨和桨后发电机的理论计算方法。螺旋桨的理论计算采用势流方法,基于涡格法(VLM)编制了计算程序;桨后发电机的计算采用叶素动量方法。对于在桨后工作的发电机,其来流具有高度的非均匀性和旋转速度,因此需对常规的叶素动量理论进行修改,以适应来流条件条件。其次对螺旋桨和桨后发电机进行一体化优化设计。首先对螺旋桨进行优化,设置适当的目标函数,基于遗传算法,调用螺旋桨的VLM计算程序,获得优化的螺旋桨的桨型;再用CFD完成验证计算,按CFD的计算数据确定对桨后发电机的设计要求,并输出尾流速度场作为桨后发电机计算的输入条件。同样基于遗传算法,进行桨后发电机的设计。先对二维翼型进行优化,获得高性能的二维翼型;再建立从二维到三维的优化设计方法,用于桨后发电机的设计。为体现一体化设计的效果,这里将螺旋桨的性能数据输入到发电机设计模块,用于确定发电机的设计目标函数;将螺旋桨的尾流场作为桨后发电机工作的来流条件。基于遗传算法和修正叶素动量理论,得到若干优化的发电机型式,从中选取最优的型式,作为发电机的设计方案。最后,建立组合推进器的CFD计算模型,进行一体化性能计算,从而校验设计方案,并对总体性能做出评价。更多还原

【Abstract】 Research on a new concept of energy saving device is conducted in this dissertation.An energy recovering turbine is arranged behind a marine propeller,generated by the slipstream of the propeller,and extracts the kinetic energy of slipstream.The core of this research is the integrative design method for propeller and energy recovering turbine.A conventional propeller and a marine current turbine is applied as prototypes,which are optimized individually,and constitute a combined propulsor.The first part of this research is theoretical methods of performance prediction for both propeller and turbine.Vortex Lattice Method is applied for propeller,and Blade Element Momentum Theory(BEMT)is modified in this dissertation,since the conventional theory is not applicable for inflow condition of a turbine behind a propeller.Secondly,integrative optimal design is conducted for both propeller and turbine.Optimization for propeller is conducted as the first step,and an optimum geometry of propeller is obtained based on Genetic Algorithm(GA),as well as an appropriate objective function and GA controlled VLM program.CFD simulation is applied as validation,and performance data and simulation of the slipstream is exported to the module for turbine design.The second step for integrative design is the optimization for turbine,which is based on GA as well.Optimization for 2-dimensional hydrofoils is conducted first,and the optimal method from 2D foils to 3D blade is established.Performance data of propeller is applied in the objective function of turbine design,and the slipstream of propeller is applied as the inflow condition of turbine.Several optimal turbine blade is obtained based GA and GA controlled modified BEMT,and the optimum one is selected among them,as the final plan for turbine.Finally,CFD computation model is established for the combined propulsor,and integrative simulation is conducted to as the validation,and performance in general is evaluated based on the CFD simulation as well.更多还原