基于MRF方法和滑移网格的螺旋桨水动力性能研究

本文基于计算流体力学(CFD)方法,对多重参考系模型(MRF)及滑移网格模型(SM)在计算螺旋桨水动力性能时的差异进行了探讨。将以上两种模型应用到4381螺旋桨的水动力性能计算中,首先将计算得到的推力系数及转矩系数与试验数据进行了对比,考察了两种计算模型对螺旋桨的敞水性能的预测情况,并进一步对两种模型计算得到的螺旋桨盘面的速度场、桨叶的压力分布、桨后涡量云图等进行了对比分析。计算结果表明,滑移网格模型相较于多重参考系模型,对螺旋桨的推力系数的模拟结果误差更小,扭矩系数方面,两种模型的模拟结果相差不大；对于进速系数较大时,两种模型模拟得到的压力分布及速度分布较为相似,但对于高负荷情况,滑移网格模型可以更好地捕捉桨叶的压力分布及桨盘面处的速度分布情况；进速系数较小时,多重参考系模型可以模拟出涡结构的发散现象,而滑移网格模型可以更好的在高进速系数情况下捕捉到梢涡结构。

Study on Hydrodynamic Performance of propeller Based on Multiple Reference Frame Model and Sliding Mesh

Based on computational fluid dynamics (CFD) method, the difference between multiple reference frame model (MRF) and sliding mesh (SM) in calculating hydrodynamic performance of propeller is discussed in this paper. The two models above are applied to the calculation of hydrodynamic performance of the propeller 4381, we compared the calculation results of thrust coefficient and torque coefficient with experimental data first, then investigated the prediction of open water performance of the propeller of the two calculation models, and further analyzed the velocity field at propeller disk, the pressure distribution of blade and the propeller vorticity contours calculated by the two models. The calculation results show that the sliding mesh compared to the multiple reference frame model, has smaller errors in the simulation results of propeller thrust coefficient, and the simulation results of torque coefficient, two models are similar; when velocity coefficient is larger, the two models are very similar on the simulation results of pressure distribution and velocity distribution, but in the condition of high load, the sliding mesh can better capture the pressure distribution of blade and the speed distribution at propeller disk; when velocity coefficient is small, multiple reference frame model can simulate the phenomenon about the divergence of vortex structure, and sliding mesh can be better to capture the tip vortex structure in the high velocity coefficient.