深V型双断级滑行艇水动力特性的初步数值研究

本文利用模型试验和数值手段对比研究了深V型双断级滑行艇和无断级滑行艇的静水阻力特性,试验结果表明,双断级滑行艇在起滑之后的高速航行阻力及纵向运动稳定性上较无断级模型存在明显优势,在容积弗劳德数为5.21的航速下总阻力降低了19.2%。利用CFD软件CFX能够较好地捕捉到两模型之间的差异,计算结果表明,各断级之后的空穴均随着航速的提升而不断扩张,断级模型总体浸湿面积较无断级模型最大降低了33.4%,并且双断级使得艇底水动高压分布趋于均匀,有利于改善纵向运动稳定性。

Preliminary numerical investigation on the hydrodynamic characteristics of deep-Vee planning hull with double steps

In this paper, model tests and numerical simulations are carried out to investigate the resistance characteristics of double-stepped planning hull and non-stepped planning hull in deep-V type. Experimental results show that the stepped model has advantage in high-speed resistance and longitudinal motion stability, the total resistance is decreased by 19.2% at the Froude number of 5.21. Comparison between calculated and experimental results confirms that the CFD software CFX could capture the diversity caused by steps, it is found that the air cavity behind step extends backwards with increasing speed, as a consequence, the maximum reduction of wetted area can be 33.4% for the stepped model; the presence of steps could also improve the longitudinal stability since the high pressure region is divided and distributed more uniformly on hull bottom.