悬停状态倾转旋翼/机翼干扰流场及气动力的CFD计算

doi:10.7527/S1000-6893.2013.0220

Abstract

Abstract:

Based on the multi-layer moving-embedded grid technique, an efficient hybrid computational fluid dynamics (CFD) method is developed to analyze the aerodynamic interaction characteristics of the tiltrotor and wing in hover. A highly-efficient multi-layer moving-embedded grid technique is first established. Compressible Reynolds-averaged Navier-Stokes (RANS) equations with an Spalart-Allmaras turbulence model are employed in the tiltrotor/wing grid region, while Euler equations are chosen to simulate the transition/background region. In order to solve the unsteady flowfield of the tiltrotor/wing, a dual-time method is used. In the present study, the SMPD (Single Program Multiple Data) model parallel acceleration technology is adopted. On this basis, a UH-60A rotor and XV-15 tiltrotor are taken as numerical examples to verify the validity of the established method. Then the unsteady interaction flowfield of the tiltrotor/wing are investigated in detail, and the special "fountain effect" phenomenon is simulated. Due to the interaction effect, the thrust coefficient of the tiltrotor is slightly decreased by 3% than that of an isolated rotor, but the total thrust coefficient loss is about 17% as compared to the isolated rotor. It is demonstrated that the tiltrotor/wing interaction in hover has significant effect on the aerodynamic perfor-mance of the tiltrotor aircraft.

Key words: tiltrotor aircraft, aerodynamic interaction, hover, multi-layer moving-embedded grid, parallel computing, computational fluid dynamics

CLC Number:

LI Peng, ZHAO Qijun. CFD Calculations on the Interaction Flowfield and Aerodynamic Force of Tiltrotor/Wing in Hover[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2014, 35(2): 361-371.

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CFD Calculations on the Interaction Flowfield and Aerodynamic Force of Tiltrotor/Wing in Hover

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