ACTA AERONAUTICAET ASTRONAUTICA SINICA >
CFD Calculations on the Interaction Flowfield and Aerodynamic Force of Tiltrotor/Wing in Hover
Received date: 2013-03-15
Revised date: 2013-04-18
Online published: 2013-05-17
Supported by
National Natural Science Foundation of China (11272150)
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.
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 . DOI: 10.7527/S1000-6893.2013.0220
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