轮缘推进器反厚度规律桨叶的翼型对比分析

In order to develop hubless propellers suitable for rim-driven thrusters (RDT), based on Ka+19A ducted propellers, this paper constructs blades with thick blade tips and thin blade roots. According to different principles, three sets of blade airfoils are designed, named Type1, Type2, Type3. Among them, Type1 is obtained by scaling the coordinates in the thickness direction in the prototype blade in equal proportions. Type2 maintains the arch line of the original airfoil, and the thickness is scaled on the same basis. Type3 replaces the airfoil near the blade tip with a high lift-drag ratio airfoil on the basis of Type1. Use CFX to analyze the open water performance of the three blades. The results show that the blade tip pressure distribution is not uniform with the inverse thickness rule, a large area of high pressure area appears on the suction surface near the leading edge and the position of the trailing edge, and a large area of low pressure area appears on the pressure surface. Type1 airfoil tip pressure varies greatly from leading edge to following edge, and the open water performance is worse than that of the prototype propeller; Type2 blades can maintain the airfoil angle of attack basically unchanged, but the tip load is reduced, and the open water performance is reduced; Type3 blade pressure is more evenly distributed along the tangential direction, and the open water performance is the best of the three. The results of this study can provide a reference for the design of RDT's reverse thickness propeller.