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应用激励盘模型,采用计算流体力学(CFD,Computational Fluid Dynamics)方法结合动量叶素理论,计算了旋翼在垂直下降时的流场特征与气动性能.计算过程中,旋翼载荷被描绘成沿桨盘径向分布、与当地流动参数相关的压力源项.在直角坐标系中,运用有限体积方法直接求解了定常不可压N-S(Navier-Stokes)方程,湍流模型为S-A(Spalart-Allmaras)一方程模型,重点使用诱导速度经验公式计算出了压力源项.旋翼流场模拟结果和性能预计结果同实验测量数据吻合较好,表明这种CFD方法可以有效地分析旋翼下降飞行时的空气流动特性,为进一步的涡环状态研究提供了参考.
Applying the excitation plate model, Computational Fluid Dynamics (CFD) method and momentum vorticity theory are used to calculate the flow field and aerodynamic performance of the rotor when it descends vertically. During the calculation, Radial distribution, and pressure source terms related to local flow parameters.In the Cartesian coordinate system, the Navier-Stokes equation is solved directly by the finite volume method, and the turbulence model is the Spalart-Allmaras equation equation , And the pressure source term was mainly calculated using the empirical formula of induced speed.The simulation results and the predicted results of rotor flow field are in good agreement with the experimental data, which shows that this CFD method can effectively analyze the air flow characteristics of the rotor when flying down Further vortex ring state research provides a reference.