喷水推进器进水流道参数化设计方法

Research on the parametric design of an inlet duct found in a marine waterjet

为了提高喷水推进器进水流道的设计水平,改善其水动力性能、缩短设计周期、降低设计费用,研究了进水流道的参数化设计方法.在该方法中,进水流道的三维几何结构采用11个动态关联的控制参数定量描述.改变这些控制参数的值可自动调整流道的三维空间形状,实现流道几何的快速建模.在此基础上,利用计算流体力学方法对进水流道及船尾流场进行数值计算,用进水流道的出流均匀度、流动分离程度、空化程度、流动损失程度以及变工况适用性等多项指标对进水流道的流体动力性能进行综合评估.流道三维几何结构的参数化建模和综合流体动力性能的数值模拟这2个过程迭代运用,可实现进水流道的优质、快速设计.

In order to satisfactorily design an inlet duct found in marine waterjets in a way that economically uses time and money,a parametric design method was investigated in this article.The 3-D geometry of the inlet duct was characterized and created by eleven governing parameters which were incident with one another.Its shape could be modified automatically by turning the value of the governing parameters.The viscous flow in regions around the inlet duct and stern was simulated by means of a computational fluid dynamics code.The hydrodynamic performance of the inlet duct can be evaluated in the round according to flow uniformity at the duct outlet,flow separation,cavitations,flow loss inside the duct,and the applicability to various working conditions.Multiple iterations between the parametric modification of the geometry and CFD simulation of the flow field can quickly result in an excellent inlet duct design.