以某涵道螺旋桨为研究对象，利用动量理论分析了孤立螺旋桨和涵道螺旋桨产生不同拉力的原因；同时利用SST k－ω湍流模型，采用三维Navier-Stokes方程，利用滑移网格模型，通过数值模拟分别计算了孤立螺旋桨与涵道螺旋桨的复杂流动，分析它们在不同转速下，拉力系数、功率系数和效率的差异。分析表明，加上涵道以后，有效抑制了螺旋桨桨尖涡，减少了能量损失。在相同转速下，总拉力系数增加23％，涵道螺旋桨的拉力系数与功率系数的比值比孤立螺旋桨的高出40％，效率显著提高，同时需用功率系数也略有增加，约0．05，结果与理论分析相吻合。%Taking a ducted fan rotor as the study object,the reasons why open rotor and ducted rotor produce different lift were researched through the momentum theory.At the same time,the three-dimensional Navier-Stokes equations and SST k-ωturbulence model were used to simulate the complex flow around the open and ducted rotor,which was based on the sliding mesh method.It also analyzed their differences in lift coefficient,power coefficient and efficiency at different rotating speed.The duct restrains tip vortexes and reduces energy wastage markedly,which make the lift coefficient increase 23%and the radio of lift and power coefficient augment 40%.Efficiency is obviously improved and the required power coefficient is slightly increased to 0.05.The results coincide with the theoretical analysis.
展开▼
