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Numerical simulation of hydrodynamic performance of ice class propeller in blocked flow using overlapping grids method

机译：基于重叠网格法的冰类螺旋桨受阻流水动力性能数值模拟

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摘要

One the basis of the technique of computational fluid dynamics (CFD), combined with the overlapping grids method, this paper establishes a numerical simulation method to solve the problem of ice propeller interaction in a viscous flow field. A numerical simulation was carried out to forecast the hydrodynamic performance of ice class propeller and flow characteristics in blockage conditions. Trimmed Mesh is used in the entire calculation domain, and the overlapping grid method was used to transfer the information between the propeller rotation calculation domain and the ice calculation domain. The grids in the gap between the ice and propeller were set as partial grid refinement to ensure the accuracy of the flow field in detail. By comparing the CFD result with the model experimental results, errors of hydrodynamic performance results were within 5%. The feasibility of the calculation method can be verified. It appears from the analysis of calculation results that the propeller thrust coefficients and torque coefficients increased sharply at the point at which the gap between the ice and blade was less than 10%R. From the pressure distribution of the blade's surface, it can be shown that the blade screwing in ice interference area resulted in the fluctuating extremum of propeller hydrodynamic coefficient.
机译：本文以计算流体力学（CFD）技术为基础，结合重叠网格法，建立了数值模拟方法，解决了粘滞流场中螺旋桨相互作用的问题。进行了数值模拟，以预测在堵塞条件下冰级螺旋桨的水动力性能和流动特性。修剪网格用于整个计算域，重叠网格方法用于在螺旋桨旋转计算域和冰计算域之间传递信息。将冰和螺旋桨之间的间隙中的栅格设置为局部栅格细化，以详细确保流场的准确性。通过将CFD结果与模型实验结果进行比较，流体动力性能结果的误差在5％以内。可以验证该计算方法的可行性。从对计算结果的分析中可以看出，螺旋桨的推力系数和扭矩系数在冰与叶片之间的间隙小于10％R时急剧增加。从叶片表面的压力分布可以看出，叶片拧入冰干扰区域会导致螺旋桨流体动力系数的极值波动。

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