To analyse a possible way to improve the propulsion performance of ships,the unstructured grid and the Reynolds Average Navier-Stokes equations were used to calculate the performance of a propeller and rudder fitted w...To analyse a possible way to improve the propulsion performance of ships,the unstructured grid and the Reynolds Average Navier-Stokes equations were used to calculate the performance of a propeller and rudder fitted with additional thrust fins in the viscous flow field.The computational fluid dynamics software FLUENT was used to simulate the thrust and torque coefficient as a function of the advance coefficient of propeller and the thrust efficiency of additional thrust fins. The pressure and velocity flow behind the propeller was calculated. The geometrical nodes of the propeller were constituted by FORTRAN program and the NUMBS method was used to create a configuration of the propeller,which was then used by GAMMBIT to generate the calculation model. The thrust efficiency of fins was calculated as a function of the number of additional fins and the attack angles. The results of the calculations agree fairly well with experimental data,which shows that the viscous flow solution we present is useful in simulating the performance of propellers and rudders with additional fins.展开更多
针对船舶运动的非线性本质,为舵鳍联合系统建立了具有通用性的非线性数学模型。首先基于MMG(Ship Manoeuvring Mathematical Model Group)的建模思想,建立一个包含风、浪、流干扰的4自由度舵鳍联合非线性数学模型,并详细给出了模型涉及...针对船舶运动的非线性本质,为舵鳍联合系统建立了具有通用性的非线性数学模型。首先基于MMG(Ship Manoeuvring Mathematical Model Group)的建模思想,建立一个包含风、浪、流干扰的4自由度舵鳍联合非线性数学模型,并详细给出了模型涉及的参数及流体动力导数的计算公式。然后利用该模型对"Hual Trooper"号汽车运输船及"Belnor"号散货运输船进行回转试验及Z形试验的仿真,得到了一系列与实船试验曲线接近的仿真曲线。仿真结果说明了该模型的正确性和工程可行性。展开更多
文摘To analyse a possible way to improve the propulsion performance of ships,the unstructured grid and the Reynolds Average Navier-Stokes equations were used to calculate the performance of a propeller and rudder fitted with additional thrust fins in the viscous flow field.The computational fluid dynamics software FLUENT was used to simulate the thrust and torque coefficient as a function of the advance coefficient of propeller and the thrust efficiency of additional thrust fins. The pressure and velocity flow behind the propeller was calculated. The geometrical nodes of the propeller were constituted by FORTRAN program and the NUMBS method was used to create a configuration of the propeller,which was then used by GAMMBIT to generate the calculation model. The thrust efficiency of fins was calculated as a function of the number of additional fins and the attack angles. The results of the calculations agree fairly well with experimental data,which shows that the viscous flow solution we present is useful in simulating the performance of propellers and rudders with additional fins.
基金Foundation item： Supported by the National Natural Science Foundation of China （Grant No. 61174047） and the Fundamental Research Funds for the Central Universities （HEUCF041406）.
