| Citation: | TAN Jianfeng, SUN Yiming, WANG Haowen, et al. Analysis of rigid coaxial rotor unsteady interactional aerodynamic loads[J]. Journal of Beijing University of Aeronautics and Astronautics, 2018, 44(1): 50-62. doi: 10.13700/j.bh.1001-5965.2017.0033(in Chinese)
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The maximum forward speed for helicopter increases by adopting rigid coaxial rotor system, while the vibration load in rotor system obviously increases. In order to analyze the vibration characteristics of high-speed rigid coaxial rotor system, it is necessary to investigate unsteady aerodynamic loads of rigid coaxial rotor with aerodynamic interaction. Therefore, a rotor reverse flow aerodynamic model is established based on an unsteady panel method through satisfying boundary conditions of blade leading-edge and trailing-edge to reflect the influence of the reverse flow on the retreating side of the high-speed coaxial rotor. Moreover, a rigid coaxial rotor tip-vortex-blade aerodynamic model is added to describe the influence of aerodynamic interaction between the coaxial rotors. Coupling those models with the wake model of coaxial rotor based on a viscous vortex particle method, an unsteady aerodynamic analysis method under aerodynamic interaction of high-speed rigid coaxial rotor is established. The aerodynamic load at characteristic span of X2 rigid coaxial rotor is simulated during forward flight, and compared with the results of PRASADUM and CFD/CSD based on NASA OVERFLOW and CREATE AV Helios to validate the effectiveness of the present unsteady aerodynamic analysis method. Compared to PRASADUM, the present method better describes the variation characteristics of unsteady airloads of the upper and lower rotors on the advancing and retreading sides, and the results agree better with the computational results of CFD/CSD. Finally, the influence of aerodynamic interaction between the X2 upper and lower rotors on the unsteady aerodynamic loads is analyzed, and the difference of unsteady aerodynamic load between the single rotor and coaxial rotor is also investigated. It is shown that the unsteady aerodynamic load of rigid coaxial rotor is affected obviously by the tip vortex of coaxial rotor at low speed, while it is influenced by coaxial rotor blade at high speed. The characteristic of aerodynamic load of coaxial rotor is radial distribution with number of blades at high speed.
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