艏柱对高速船顶浪中水动力性能影响

依托NPL 4b船型的实验数据,分别验证了基于STF切片理论和雷诺平均Navier-Stokes(RANS)方法计算程序的可信度.采用带尾端修正的STF切片法计算并分析了4种不同艏柱船型的高速船舶在顶浪、Froude数为0.8、遭遇频率为2~20rad/s条件下航行时的耐波性能,采用RANS方法得到在设计航速和波长为1.5倍船长的顶浪规则波中船舶运动的时历曲线,建立了顶浪规则波中,船体周围的兴波特性和船舶本身深沉、纵摇与船舶阻力(摩擦阻力和剩余阻力)的关系.同时,讨论了4种不同艏柱船型的水动力性能的优劣及其适用的对象船舶.结果表明,在高速航行中,NPL 4b母型船的摩擦阻力较小,斧头型艏船的兴波性能最佳,穿浪体型艏船在波浪中的总阻力最小.

Influence of Bowshape on Hydrodynamic Performance of High Speed Vessels in Head Seas

Based on the experimental hydrodynamic performance data of NPL 4b, the codes based on the STF (Salvesen Tuck Faltinsen) method and RANS method were developed and validated. Then the ship hulls with different bowshapes were investigated in head seas adopting the STF method and RANS method respectively. The former conditions are Fr=0.8，2≤ωe≤20 and the latter ones are Fr=0.8 and λ=1.5Lpp. The relationships between the wave profile along the hulls and the motions of the ships with the frictional resistance and the residual resistance were discussed respectively. Finally, conclusions on the advantages and disadvantages of the four different hulls were drawn, which showed that the origianl hull had the lowest frictional resistance, the AXE one had the lowest wave making resistance while the wave piecing one performanced best in waves.