轮缘推进器水动力性能影响因素数值研究

为指导轮缘推进器(RDT)水动力学设计,借助CFD方法,对RDT各主要几何特征对其水动力性能影响开展研究。首先,验证CFD数值方法分析RDT水动力特性的有效性;然后,基于CFD研究RDT水动力性能的各主要影响因素,主要包括导管的长径比、扩散比、导管收缩比和桨叶梢径比。结果表明:RDT最佳长径比随载荷系数递增,并趋于一极限值,相比于导管扩散比和收缩比,导管长径比因素更能主导RDT的设计优化;RDT最佳扩散比随载荷系数递减,并趋于一极限值,最佳扩散比随长径比递减;RDT的收缩比对水动力性能影响不及扩散比和长径比显著,最佳收缩比随载荷系数呈线性递增,随长径比递减;RDT的最佳梢径比随载荷系数递增,无毂RDT比有毂RDT具有更小的最优梢径比。研究结果可为轮缘推进器的水动力学设计和优化提供参考。

Numerical Research of Hydrodynamic Performance Impact Factors of Rim-driven Thruster

In order to guide the hydrodynamic design of the Rim-driven Thruster(RDP), this paper studies on the key impact factors to the hydrodynamic performance of RDP by using computational fluid dynamics (CFD) method. First of all, the validity of CFD numerical method to predict the hydrodynamic performance of RDP is verified. Then, aiming at several key geometric inmpact factors,the open-water performances of RDP under are analyzed by CFD,respectively . including: with or without hub, the ratio of the length of duct to diameter of the propeller, the diffusion coefficient of the duct, the contraction coefficient of the duct. The results show that reducing the ratio of length to diameter makes the thrust coefficient and torque coefficient increase at the same time, while the open-water efficiency decreases; properly increasing the ratio of length to diameter can slightly improve open water performance of RDP; reducing the diffusion coefficient within a certain range causes the thrust coefficient and torque coefficient increase significantly at the same time, and increasing the contraction coefficient will cause the thrust coefficient and torque coefficient decrease at the same time. The research results can support the optimal design of the RDP.