悬停状态共轴刚性双旋翼非定常流动干扰机理

doi:10.7527/S1000-6893.2015.0106

Abstract

Abstract:

A computational fluid dynamics(CFD) method based on moving-embedded grid technique is established to simulate the unsteady flow field of the coaxial rigid rotor in hover. In this solver, based on the highly-efficient moving-embedded grid technology, the simulation method is developed by solving the compressible Reynolds-averaged Navier-Stokes(RANS) equations with Baldwin-Lomax turbulence model and a dual-time method. Based upon the validation of the present CFD method, during the process of blade-vortex interaction in hover, close vortex-surface interactions and impingement phenomenon have been observed; at the same time, the interaction process among the vortexes shed from the upper blades and lower blades has been captured obviously, as a result, the evolution laws of position and strength of blade-tip vortex shed from different blades are obtained in detail. Furthermore, the periodic unsteady characteristics and variation trend of the aerodynamic forces of the upper rotor and lower rotor have been analyzed. The simulation results demonstrate that the upper blade vortices can impinge upon the lower blade, which causes the thrust loss of lower blade; the strength and positions of the vortexes shed from upper blades and lower blades could change due to the interaction; the forces on both the upper and lower rotors increase as the blades approach, then decrease and increase again as they move away.

Key words: coaxial rigid rotor, unsteady flow field, interaction mechanism, blade-tip vortex, computational fluid dynamics, hovering condition, moving-embedded grid

CLC Number:

V211.3

ZHU Zheng, ZHAO Qijun, LI Peng. Unsteady flow interaction mechanism of coaxial rigid rotors in hover[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2016, 37(2): 568-578.

References

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Unsteady flow interaction mechanism of coaxial rigid rotors in hover

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