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New embedded grid method for aerodynamic analyses of tiltrotor aircraft[J]. Journal of Aerospace Power, 2017, 32(9): 2145-2159. doi: 10.13224/j.cnki.jasp.2017.09.014
Citation: New embedded grid method for aerodynamic analyses of tiltrotor aircraft[J]. Journal of Aerospace Power, 2017, 32(9): 2145-2159. doi: 10.13224/j.cnki.jasp.2017.09.014
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New embedded grid method for aerodynamic analyses of tiltrotor aircraft

doi: 10.13224/j.cnki.jasp.2017.09.014
  • Received Date: 2016-01-12
  • Publish Date: 2017-09-28
    Abstract
  • To overcome the difficulties in generating high quality integrative structured grids around the tiltrotor aircraft, the multiblock grid strategy and embedded grid method were combined to establish a new embedded grid generation method, which was suitable for aerodynamic interaction analyses of tiltrotor aircraft. On the basis of keeping the interpolation accuracy, the whole grid system composed of the multiblock grids was used to reduce the size of the grids. Firstly, the InverseMap method was introduced for auxiliary localization, and the new multidirectional projection method was proposed to ensure the continuity of the hole boundaries among the multiblock grids. Then, the independent embedded grid strategy was used in completing the combination of the airframe and background grids, and the assistant coordinates were adopted in the identification of the background boundary grids. Compressible RANS (Reynolds averaged NavierStokes) equations with SA(SpalartAllmaras) turbulence model were employed in the bodyfitted region, and Euler equations were chosen to simulate the background region. In the present method, the SPMD (single program, multiple data) model parallel acceleration technology was adopted to improve the computational efficiency. On this basis, Robin airframe was taken as the numerical example to verify the validity of the present CFD method. Then the interaction flowfields of tiltrotor aircraft in different modes were investigated emphatically, and several simulated results (special fountain effect phenomenon in hover, special flowfield in conversion mode, and variations of the aerodynamic characteristics of the tiltrotor aircraft in cruise) were obtained. The proposed embedded grid method and the numerical method were demonstrated to be effective in investigating the aerodynamic configuration of the tiltrotor aircraft, laying a good foundation for analyzing aerodynamic characteristics of the tiltrotor aircraft, with the speedup greater than 50.

     

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