尺度效应对三体船各阻力成分的影响

Influence of Scale Effect on Resistance Components of Trimaran

针对常规方法基于三体船雷诺数采用相当平板公式估算其摩擦阻力时,会高估三体船的摩擦阻力成分,从而导致换算误差的问题,借助NPL单体船阻力试验结果验证了数值模拟方法的有效性,针对不同缩尺比的三体船模型进行了各阻力成分的数值预报,基于数值结果探讨了三体船阻力成分关于水动力系数的变化规律,在总结规律基础上提出了三体船阻力换算的改进方法.不同方法所得的三体船阻力结果与实尺度数值结果对比表明,改进的换算方法一定程度上提高了三体船实船阻力的预报精度.

The traditional method based on the Reynolds number of the trimaran used the equivalent slab formula to estimate the frictional resistance,and the frictional resistance component of the trimaran was overestimated resulting in the conversion error.Firstly,the numerical simulation method was validated by the NPL single-hull resistance test.Then the numerical predictions of the resistance components of the trimaran model with different scaling ratios were carried out.Finally,the variation rules of the resistance components of the trimaran on the hydrodynamic coefficients were discussed based on the numerical results.An improved method for calculating the resistance of a trimaran was proposed on the basis of summarizing the regularity.The resistance results of the trimaran obtained by different methods were compared with the numerical results of the real scale.The results show that the improved conversion method improves the prediction accuracy of the real ship resistance of the trimaran to a certain extent.