【摘要】 为了开发适用于轮缘驱动推进器(RDT)驱动电机安装的特殊导管,对19A导管进行了改型设计。保持导管内表面几何形状不变,以电机尺寸及两端高度作为导管外表面的控制点,通过导圆保证导管前缘与尾缘光滑过渡,得到一系列的导管。采用Ka系列螺旋桨与导管匹配,并对其敞水性能进行了数值分析。计算结果表明:当导管尾缘高度不变,增大前缘高度时,RDT的推力与转矩均随着进速系数的增大而减小,在高进速系数下由于推力系数下降幅度较大,导致RDT的效率降幅随之增大。当前缘高度不变时,增大尾缘高度,敞水效率、推力和转矩都随进速系数的增大呈现先增大后降低的趋势。分析发现,前缘高度变化会增大进口阻力,影响螺旋桨性能;而尾缘高度变化则会引起导管后段外壁与尾部发生流体分离及旋涡的形成,影响导管尾部至螺旋桨压力面的压力场分布,进而影响RDT的敞水性能。更多还原

【Abstract】 In order to develop a special duct suitable for the installation of the drive motor of the rim drive thruster(RDT), the 19 A duct is redesigned. The Ka series of propeller is matched with the duct, and its open water performance is analyzed numerically. Calculation results show that when the height of the trailing edge remains unchanged and the height of the leading edge is increased, the thrust and torque of the RDT decrease with the increase of the advance coefficient. The thrust coefficient decreases greatly at high advance coefficient, and an increase in the efficiency of the RDT is resulted. It is found that the change of the height of the leading edge will increase the inlet resistance and affect the performance of the propeller, while the change of the height of the trailing edge will cause the separation of fluid and the formation of vortices, which will affect the open water performance of the RDT.更多还原