喷水推进器进水流道参数化设计与应用

Parametric Design and Application of Inlet Duct of Marine Waterjet

为了优质高效地设计喷水推进器的进水流道,使其流体动力性能综合兼优,提出了喷水推进器进水流道的一种参数化设计方法.该方法将进水流道的三维几何结构用16个相互关联的参数来描述和构建.流道背部与船体的交界区域以及流道的唇部等流动复杂的区域采用贝塞尔曲线构建.调整16个参数中任一参数的值,其他参数能够根据参数间的关联性自动变化,为快速、灵活、精确地构建和修改进水流道几何结构创造了条件.参数化方法设计的进水流道的综合流体动力性能采用计算流体力学方法进行数值计算,并根据分析结果有针对性地进行流道结构的再调整.将流道几何的参数化建模与流体动力性能的数值计算联合使用能够实现综合流体动力性能优良的进水流道的快速设计.该参数化设计方法用于某喷水推进艇进水流道改进设计时取得了良好效果.

In order to design an outstanding-performance inlet duct of marine waterjet in a quick and effective way,a parametric design method was introduced in this paper.In this method the 3-D configurations of the inlet duct was characterized with sixteen governing parameters.The lip at the intake and the boundary region between ramp and hull were established with Bezier curves,where the flow changed sharply.The sixteen governing parameters were associated mutually.If one parameter changed,the other parameters could be adjusted automatically in consequence according to the relationship among them,which made it possible to create or modify accurately the inlet duct structure in a fast and flexible way.Then the hydrodynamic performance of the inlet duct was analyzed in the round by means of computational fluid dynamics,on the ground of which analysis results of the configuration of the inlet duct was modified in reason.Iterative usage of the parametric modeling of inlet duct geometry and the hydrodynamic performance evaluation by means of computational fluid dynamics simulation could result in an excellent inlet duct design in a fast way.And the parametric design method was applied successfully to redesign the inlet duct of a waterjet-propelled craft.