A new-type marine propeller called Multi-Blade Coupling Propeller (MBCP) is provided, and the hydrodynamic performance of it is studied. The MBCP adopts a brand-new form of axial misplacement for inner radius blades and even placement in the same blade-plane for outer radius blades. Thus the mul-ti-layer coupling distribution of propeller blade is achieved. Favorable hydrodynamic interference between different blades is created, and the influence of hydrofoil cascade effect is reduced. Then the blade num-ber can be increased or the area ratio can be enlarged while the propeller efficiency maintains in the same level. Therefore, the performance of cavitaion, noise and unsteady force can be improved. The MBCP may provide a new research direction for the low-noise propeller design work. The CFD numerical simulation and model test of the MBCP are carried out to study the open water and cavitation performance of the MBCP. Theoretical and experimental research shows that cavitation performance and efficiency of the MBCP can be improved about 20% and 7% respectively, compared with a now-utilized five-blade marine pro-peller. The error of CFD numerical simulation is less than 3%. The new-type low-noise multi-blade cou-pling propeller presented in this paper may be of great military significance.%提出了一种船用螺旋桨的新构型--低噪声多叶耦合螺旋桨，并研究了该新构型的水动力性能。多叶耦合螺旋桨通过采用桨叶内半径轴向错位、外半径同盘面均匀布置的全新形式，实现螺旋桨桨叶多层耦合分布，使得各桨叶间产生有利的水动力干涉，降低翼栅效应的影响，达到增加桨叶数或盘面比而不降低推进效率的目的，从而提高了螺旋桨的空泡、噪声、非定常力等性能，开拓了低噪声螺旋桨设计的新思路。通过CFD数值模拟和模型试验，开展了低噪声多叶耦合螺旋桨的敞水性能及空泡性能研究。理论与试验结果表明，与现有某船五叶螺旋桨相比，新型多叶耦合螺旋桨空泡性能提高约20%，推进效率提高约7%；基于CFD数值模拟的多叶耦合螺旋桨敞水性能预报方法精度达2%。该文提出的新型低噪声多叶耦合螺旋桨对提高水面、水下推进器的声隐身性能具有重大的军事意义。
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