基于CFD的船舶喷水推进器优化设计

Waterjet optimal design based on CFD technology

介绍了计算流体力学(CFD)作为一种先进手段在喷水推进器水力性能分析、结构优化设计和推进性能检验中的重要应用。界定了喷水推进器数值计算域,采用结构化网格进行空间离散,选择剪切应力输运湍流模型进行数值计算。在进行了网格无关性分析的基础上,计算了某新型喷水推进泵的外特性,并采用多种定性和定量指标对导叶的整流效果和进水流道的引流性能进行评估,并进行了合理的优化改进。在各部件性能优良的基础上,对"船+泵"流场进行整体计算,通过壁面积分法求取喷水推进器产生的有效推力进行船舶快速性预报。CFD技术的应用为喷水推进器最终设计成功提供了有力保障。

The important application of computational fluid dynamics （CFD） for marine waterjet performance analysis, optimal design and propulsion characteristic prediction was introducted. The solution domain of waterjet was defined and meshed by hexagonal structured grids. Turbulence effects were taken into account by using shear stress transport turbulent model. This model was applied to a newly designed waterjet pump on base of grid density independence examined. Several qualitative indexes and quantitative ones were adopted to evaluate the diffuser＇s rectifying performance and the intake duct＇s flow-delivering characters. Some reasonable suggestions for optimal design were provided. The flow field of hull and waterjet was simulated on the base of every component had a good work. Area-integration method was employed to deduce the thrust character, which could make certain the ship speed and guarantee a successful outcome.