基于面元法的吊舱推进器性能计算

为研究吊舱推进器性能,应用势流面元法开发了定常流中计入吊舱与螺旋桨桨叶相互作用的水动力性能计算方法.基于格林定理,考虑了分布在桨叶、桨毂、吊舱、支架的定常源和偶极子的联合作用,以及推进系统尾流场中偶极子代表的势流绕流的相互作用.对库塔条件进行设定,并基于三维问题的考虑,计算中引入了横向流的影响,保证随边单元上的压力相等.为满足推型吊舱螺旋桨设计的需要,给出了有关水动力和压力分布的数值模拟结果.计算结果与相应的试验数据的比较表明,计算误差在5%以内.

Surface panel method-based podded propulsion performance calculation

A potential-based surface panel method for podded propeller in steady flow was developed concerning the interaction between pod and propeller blades in hydrodynamics.Numerical calculation was based on the Green theorem and composed of the combination of constant source and dipole distributions on the surfaces of blades,hub,pod,strut and its distribution on the trailing wake to represent the potential flow around the propulsive system.Special attention was paid to the Kutta condition,which was used to ensure pressure equivalency on the panels at trailing edges.The cross flow component was taken into consideration for its significant effect on three dimensional problems.Some numerical simulations,including hydrodynamic forces and pressure distributions for podded propeller of push type were provided for podded propeller design.Simulation results show that computational results match well with experimental results,and calculating error is within 5%.