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首页> 外文期刊>Journal of marine science and technology >Model and full scale CFD analysis of propeller boss cap fins (PBCF)
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Model and full scale CFD analysis of propeller boss cap fins (PBCF)

机译：螺旋桨凸台鳍片（PBCF）的模型和全面CFD分析

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Computational fluid dynamics (CFD) analyses of propeller boss cap fins (PBCF) were carried out for two different propellers at model and full scale Reynolds numbers with two different inflow conditions. Computations corresponding to the reverse propeller open test (POT) experiment were confirmed to be in a good agreement with the measurement. The results of computations at different conditions have shown that increased Reynolds number and presence of hull wake both positively influence the effects of PBCF. Due to the combined effect of the Reynolds number and the wake, the gain in the propeller efficiency at the full scale condition was found to be significantly larger than that at the model test condition. The detailed investigation of the results suggested that the fin drag becomes smaller and the reduction of the boss drag becomes larger at the full scale condition. However, the predicted gain is still smaller than the values reported in the sea trial and logbook analysis. The remaining gap may be attributed to the difference in the estimated and actual wake distribution or to other factors such as interactions with hull and rudder, surface roughness, unsteadiness and hub vortex cavitation.
机译：在模型和满量程雷诺数下，在两种不同的流入条件下，对两种不同的螺旋桨进行了螺旋桨毂盖翅片（PBCF）的计算流体动力学（CFD）分析。确认与反向推进器打开试验（POT）实验相对应的计算与测量结果吻合良好。在不同条件下的计算结果表明，雷诺数的增加和船体尾流的存在均对PBCF的影响产生积极影响。由于雷诺数和尾流的综合作用，发现在满量程条件下螺旋桨效率的增益明显大于模型测试条件下的螺旋桨效率。对结果的详细研究表明，在满量程条件下，翅片阻力变小，而凸台阻力的减小变大。但是，预测的增益仍小于海上试验和航海日志分析中报告的值。剩余的间隙可以归因于估计的和实际的尾流分布的差异，或者归因于其他因素，例如与船体和舵的相互作用，表面粗糙度，不稳定和轮毂涡流空化。

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