Transactions of Nanjing University of Aeronautics & Astronautics
Structural Parameter Analyses on Rotor Airloads with New Type BladeTip Based on CFD/CSD Coupling Method
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Abstract:
For accurate aeroelastic analysis, the unsteady rotor flowfield is solved by computational fluidynamics (CFD) module based on RANS/Euler equations and movingembedded grid system, while computational structural dynamics (CSD) module is introduced to handle blade flexibility. In CFD module, dual time stepping algorithm is employed in temporal discretization, Jameson twoorder central difference (JST) scheme is adopted in spatial discretization and BL turbulent model is used to illustrate the viscous effect. The CSD module is developed based on Hamilton′s variational principles and moderat e deflection beam theory. Grid deformation is implemented using algebraic method through coordinate transformations to achieve deflections with high quality and efficiency. A CFD/CSD loose coupling strategy is developed to transfer information between rotor flowfield and blade structure. The CFD and the CSD modules are verified seperately. Then the CFD/CSD loose coupling is adopted in airloads prediction of UH60A rotor under high speed forward flight condition. The calculated results agree well with test data. Finally, effects of torsional stiffness properties on airloads of rotors with different tip swept angles (from 10° forward to 30° backward) are investigated. The results are evaluated through pressure distribution and airloads variation, and some meaningful conclusions are drawn the moderated shock wave strength and pressure gradient caused by varied tip swept angle and structural properties.
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