船舶艏侧推器推力减缩试验与数值计算研究

摘要

论文以艏侧推桨为研究对象,用研制的专用动力仪在循环水槽中对艏侧推器螺旋桨进行了敞水试验和带船模艏侧推器的水动力性能试验.采用有限体积法,通过求解非定常RANS方程对艏侧推器螺旋桨敞水以及艏侧推器槽道流场进行了数值模拟,得到了螺旋桨的敞水性征曲线和船舶不同迎流角下艏侧推器的推力系数.将艏侧推器螺旋桨敞水性征曲线以及艏侧推器推力系数结果与试验结果对比,对比结果表明数值模拟能够较好地计算艏侧推器的水动力性能.由于康达效应和桨之间干扰的存在,艏侧推器存在推力减缩,某些流向角下艏侧推器的推力减缩幅度超过20％;此外,数值模拟也给出了康达效应的流场细节.论文结论可作为艏侧推器设计的重要参考基础,对指导工程实践具有重要参考价值.%A bow thruster is studied in this paper.Open water test of the bow thruster and hydrodynamic performance test of the bow thruster coupled with a model ship were carried out by using a special dynamometer.Flow field inside the tunnel is numerically simulated through solving the unsteady RANS equation by the finite volume method.Open water characteristic curves and thrust coefficients of the bow thruster under different flowing angles are obtained.Numerical results agree very well with measured data in the model test,which indicates that the numerical simulation is valid and reliable to predict hydrodynamic performance of the bow thruster.It is found that the thrust reduction of the bow thruster is more than 20％ due to Coanda's effect and interference of multi-propellers.Details of the flow field with Coanda's effect are presented in the paper.In summary,the paper may provide a valuable reference for design of the bow thruster and hence plays a guiding role in engineering practice.