基于MRF方法和滑移网格的螺旋桨水动力性能研究

Study on Hydrodynamic Performance of Propeller Based on MRF Model and Sliding Mesh

基于计算流体力学方法,对多重参考系模型及滑移网格模型在计算螺旋桨水动力性能时的差异进行了探讨。将以上2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2种计算模型对螺旋桨的敞水性能的预测情况,并进一步对2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,对螺旋桨的扭矩系数的模拟结果误差更小,推力系数方面,2种模型的模拟结果相差不大;对于进速系数较大时,2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地在高进速系数情况下捕捉到梢涡结构。

Based on computational fluid dynamics method, the difference between multiple reference frame model and sliding mesh in calculating hydrodynamic performance of propeller is discussed. The two models above are applied to the calculation of hydrodynamic performance of the propeller 4381, the calculation results of thrust coefficient and torque coefficient with experimental data are compared firstly, then the prediction of open water performance of the propeller of the two calculation models are investigated, 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 results show that compared with the multi reference frame model, the sliding grid model has a smaller error in the simulation of propeller torque coefficient, and the simulation results of the two models have little difference in thrust coefficient. When the inlet coefficient is large, the pressure distribution and velocity distribution of the two models are similar, but for the high load case, the sliding grid model can better capture the pressure distribution and the velocity distribution on the propeller disk. When the advancement coefficient is small, the multiple reference frame model can simulate the divergence of the vortex structure, and the sliding grid model can better capture the tip vortex structure under the condition of high advancement coefficient.