环流理论与泵理论相结合的导管桨设计优化

Optimal design of a ducted propeller based on the circulation theory and pump theory

针对导管桨的设计和优化问题,提出了螺旋桨环流理论、泵升力法相结合的方法。在设计过程中,采用升力线理论变分法求解最佳环量、泵升力法设计桨叶剖面、面元法预报导管桨性能和流场,通过迭代的方式获得推进性能收敛的导管桨。应用该方法对某案例进行了导管桨设计,并采用CFD方法对设计结果进行了验证,结果表明:该方法设计的导管桨能够满足设计要求;与其他方法设计结果对比表明,采用该方法设计的导管桨推进性能和空泡性能更好。

In this paper, a method is proposed for the optimal design of a ducted propeller. The proposed method combines the propeller circulation theory and the pump lifting line method. It obtains the optimum radial circulation distribution of the propeller by using the lifting line theory and variational calculus method. It also designs the section of propeller by the pump lifting design method, uses the surface panel method to forecast the ducted propeller performance and its velocity flow, and obtains the ducted propeller with convergent performance using the itcrative method. A ducted propeller was designed using the proposed method. The computational fluid dynamics （CFD） method was also applied to further verify the hydrodynamic performance. The results showed that the ducted Fropeller designed in this paper can meet the design requirement. The comparison with other methods showed that the proposed method for ducted propellers has a significantly improved thruster performance and cavitations performance.