喷水推进器推力预报的两种不同方法比较

Comparison of two different methods for thrust prediction of marine waterjet

概述了喷水推进器推力预报方法,研究了理论分析和CFD两种预报喷水推进器推力的方法。理论分析方法把喷水推进船整体分解成部件进行研究,从数学上描述了船底边界层对进流管道进口动量和动能的影响;结合经验系数建立了推力计算的函数关系式。CFD计算采用壁面积分的方法求取推力。文中所用的这两种方法的计算结果和厂商提供的推力特性曲线都能很好地吻合。文章最后比较了两种方法的优缺点。

Basic methods for thrust prediction of marine waterjet are briefly introduced, and the theory method and CFD method are especially discussed. When theory method is referred, the equation of thrust is derived by decomposing waterjet system into several parts and describing the influence of boundary layer on momentum and energy of the incoming water by mathematical method. Wall force integral method is used when predicting thrust by CFD. Two methods are used to calculate a practical waterjet vessel and the results from calculation are compared with the data providing by the company which produces the waterjet, they fit well. Finally, the advantage and disadvantage of the two methods are compared.