| Citation: | ZHANG Kai, ZHAO Qijun, MA Li, et al. Slowed rotor aerodynamic characteristics using CFD/CSD coupling method[J]. Journal of Aerospace Power, 2024, 39（12）：20230074 doi: 10.13224/j.cnki.jasp.20230074
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To study the aerodynamic characteristics and the flow mechanism of reverse flow region of a slowed UH-60A rotor at high advance ratios, accurate numerical simulation analysis was carried out by the CFD/CSD coupling method considering the elastic deformation of rotor blade. The CFD module adopted a moving-embedded grid system with Navier-Stokes (N-S) equations as the governing equations, and Spalart-Allmaras（S-A） turbulence model was employed. An implicit lower-upper symmetric Gauss-Seidel (LU-SGS) dual-time algorithm was adopted for temporal discretization. As for the CSD module, the finite element method of moderate deflection beam model was employed. The blade differential equations of motion were formulated and calculated using Newmark-Beta method. The CFD/CSD coupling method validity was verified by comparing the aerodynamic loads of UH-60A with the flight test data. Then, the aerodynamic characteristics of the UH-60A rotor slowing down to 40% at different advance ratios and same advance ratio with different rotation rates were studied. The results showed that the influence of collective pitch on the aerodynamic characteristics was weakened and the aerodynamic performance was reduced at high advance ratio. Large advance ratio produced large inverse flow region, where complex flow phenomena such as blade-on-blade interactions and deep dynamic stall occurred. And the high accuracy CFD/CSD coupling method can effectively simulate these phenomena.
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