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首页> 外文期刊>International Journal of Naval Architecture and Ocean Engineering >Numerical prediction analysis of propeller bearing force for full-scale hull–propeller–rudder system
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Numerical prediction analysis of propeller bearing force for full-scale hull–propeller–rudder system

机译：全尺寸船体－螺旋桨－舵系统螺旋桨轴承力的数值预测分析

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摘要

The hybrid grid was adopted and numerical prediction analysis of propeller unsteady bearing force considering free surface was performed for mode and full-scale KCS hull–propeller–rudder system by employing RANS method and VOF model. In order to obtain the propeller velocity under self-propulsion point, firstly, the numerical simulation for self-propulsion test of full-scale ship is carried out. The results show that the scale effect of velocity at self-propulsion point and wake fraction is obvious. Then, the transient two-phase flow calculations are performed for model and full-scale KCS hull–propeller–rudder systems. According to the monitoring data, it is found that the propeller unsteady bearing force is fluctuating periodically over time and full-scale propeller's time-average value is smaller than model-scale's. The frequency spectrum curves are also provided after fast Fourier transform. By analyzing the frequency spectrum data, it is easy to summarize that each component of the propeller bearing force have the same fluctuation frequency and the peak in BFP is maximum. What's more, each component of full-scale bearing force's fluctuation value is bigger than model-scale's except the bending moment coefficient about the Y-axis.
机译：采用混合网格，采用RANS方法和VOF模型，对模式和全尺寸KCS船体—螺旋桨—舵系统，进行了考虑自由表面的螺旋桨非稳态承载力的数值预测分析。为了获得自推进点下的螺旋桨速度，首先进行了全尺寸船舶自推进试验的数值模拟。结果表明，自推进点速度和尾流分数的比例效应明显。然后，对模型和全尺寸KCS船体－螺旋桨－舵系统进行了瞬态两相流计算。根据监测数据，发现螺旋桨不稳定轴承力随时间周期性波动，满量程螺旋桨的时间平均值小于模型尺的平均值。在快速傅立叶变换之后还提供了频谱曲线。通过分析频谱数据，很容易得出结论，螺旋桨轴承力的每个分量都具有相同的波动频率，并且BFP的峰值最大。而且，除了绕Y轴的弯矩系数外，全尺寸轴承力波动值的每个分量都比模型尺寸的波动分量大。

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