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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2019, Vol. 40 ›› Issue (2): 522381-522381.doi: 10.7527/S1000-6893.2018.22381

• Fluid Mechanics and Flight Mechanics • Previous Articles     Next Articles

Multi-objective wing shape optimization for a wide-body civil aircraft in wing-body-pylon-powered nacelle configuration

XUE Bangmeng, ZHANG Wensheng, SUN Xuewei, WU Yuang   

  1. Beijing Key Laboratory of Simulation Technology for Civil Aircraft Design, COMAC Beijing Aeronautical Science and Technology Research Institute, Beijing 102211, China
  • Online:2019-02-15 Published:2018-07-13
  • Supported by:
    National Level Project

Abstract: A recent effort of multi-objective wing shape optimization for a wide-body civil aircraft in Wing-Body-Pylon-powered Nacelle (WBPN) configuration is presented. Based on the momentum analysis for the flow-field of a powered-on configuration, the nominal "drag" directly from wall integration can be reasonably used as the cost function in airframe shape optimizations without thrust/drag bookkeeping. The lift losses of the baseline shape induced by pylon/nacelle and jet are calculated, and the results show the importance of considering both the installation and jet effects when designing wing shape of a wing-mounted wide-body aircraft. By running an automated optimization framework setup on a super computer, a three objective wing shape optimization process for the powered-on configuration is completed in 80 h. Nearly twenty thousand cases with 40 generations of evolution are evaluated by solving Reynolds Averaged Navier-Stokes (RANS) equations. The selected optimum has better performance of drag divergence than the baseline. A manual refinement process after automatic optimization improves both spanwise thickness variation and the distribution of sectional pressure. The drag reduction achieved under power-on configuration is also affirmed by the verification calculation under the flow through configuration.

Key words: wing-body-pylon-powered nacelle configuration, multi-objective optimization design, jet interference, Reynolds Averaged Navier-Stokes (RANS) equations, super computers

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