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首页> 外文期刊>Ocean Engineering >Scale effects on tip loaded propeller performance using a RANSE solver
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Scale effects on tip loaded propeller performance using a RANSE solver

机译：使用RANSE求解器对叶尖加载的螺旋桨性能产生比例影响

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摘要

Traditionally, the quality of alternative propeller designs at full scale has been assessed by means of model scale tests. Due the large differences in Reynolds numbers between model and full scales, model-scale-based performance predictions may be questionable in cases where viscous effects are dominant. This paper presents a numerical study about scale effects on performance coefficients for a CLT propeller with different endplate geometries. Twelve endplate shape variations were analyzed in model and full scale using RANS code FINFLO. The SST k-ω turbulence model is used as a basic model for the study. Additional computations are made with other turbulence models. A special procedure for the generation of the computational grids is implemented to minimize computational errors in the comparison of the alternative geometries. The study provides also a RANS-based scale effect on the shape of radial circulation distribution predicted for different geometry variations. The research work gives an insight into which type of modifications at full scale could be analyzed by model scale viscous flow theory or model tests in ranking alternative designs. Differences found between model and full scale numerical results make model scale analysis questionable for some specific type of modifications when full-scale performance is sought.
机译：传统上，已经通过模型规模测试来评估全尺寸替代螺旋桨设计的质量。由于模型和满刻度之间雷诺数的巨大差异，在粘性影响占主导的情况下，基于模型刻度的性能预测可能会令人质疑。本文提供了一个数值研究，研究了不同端板几何形状的CLT螺旋桨的尺度对性能系数的影响。使用RANS代码FINFLO在模型和满量程中分析了十二个端板形状变化。 SSTk-ω湍流模型被用作研究的基本模型。使用其他湍流模型进行额外的计算。实现了一种用于生成计算网格的特殊过程，以在比较其他几何形状时最大程度地减少计算误差。该研究还为基于不同几何形状变化的径向循环分布形状提供了基于RANS的比例效应。这项研究工作提供了一种见解，即可以通过模型规模粘性流理论或对替代设计进行排名的模型测试来分析哪些类型的全面修改。当寻求全尺寸性能时，模型和全尺寸数值结果之间的差异使模型尺寸分析对于某些特定类型的修改值得怀疑。

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