Aframax油船自航性能的数值和试验研究

Numerical and Experimental Study on Self-propulsion Performance of Aframax Tanker

在船舶能效指数(EEDI)实施的工程背景下,本文对一艘实际营运的阿芙拉(Aframax)油船自航性能的数值和试验方法开展了研究。首先,在SSPA拖曳水池进行了阿芙拉船模的螺旋桨敞水试验、阻力试验和自航试验。其次,基于计算流体力学(CFD)理论和Star-CCM+软件平台建立了油船自航的数值模拟方法,在此基础上对Aframax船模自航性能进行了数值模拟。采用RANS方程和SST k-ω湍流模型模拟流场粘性,将流体体积函数法(VOF)用于追踪瞬时自由液面,此外,应用滑移网格技术来处理螺旋桨旋转问题。最后,通过与试验结果进行的对比验证了数值方法的有效性,并且对Aframax油船艉部进行了型线优化。对比结果可以发现,优化线型船模的推进功率降低了2.98%。

For implementation of the energy efficiency design index(EEDI),the self-propulsion per⁃formance of an operating Average Freight Rate Assessment(Aframax)tanker was studied by numerical and experimental methods in this paper.Open water test of propeller,resistance and self-propulsion experiments for the Aframax tanker were performed at SSPA towing tank.Computational fluid dynam⁃ics(CFD)was adopted to investigate the self-propulsion performance of the Aframax model by using commercial software Star-CCM+,in which Reynolds Averaged Navier-Stokes(RANS)equations and SST k-ωmodel were applied to model the turbulent flow,volume of fluid(VOF)method was taken to track the shape of transit ship wave,and the sliding grid technique was used to handle the high-speed rotation of propeller.Finally,the numerical method was validated by comparison with the experimen⁃tal data and further employed to optimize the aft body form of the Aframax tanker.The comparison re⁃sults reveal that the delivered power in the optimized model decreases by about 2.98%.