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Volume 41 Issue 7
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Journal of Beijing University of Aeronautics and Astronautics  > 2015  >  41(7): 1313-1321.
SUN Pengpeng, HUANG Zhangfeng. Effect of sweep angle on stability and transition in a swept-wing boundary layer[J]. Journal of Beijing University of Aeronautics and Astronautics, 2015, 41(7): 1313-1321. doi: 10.13700/j.bh.1001-5965.2014.0540(in Chinese)
Citation: SUN Pengpeng, HUANG Zhangfeng. Effect of sweep angle on stability and transition in a swept-wing boundary layer[J]. Journal of Beijing University of Aeronautics and Astronautics, 2015, 41(7): 1313-1321. doi: 10.13700/j.bh.1001-5965.2014.0540(in Chinese)
shu

Effect of sweep angle on stability and transition in a swept-wing boundary layer

doi: 10.13700/j.bh.1001-5965.2014.0540
  • 1.

    Department of Mechanics, Tianjin University, Tianjin 300072

  • 2. State Key Laboratory of Aerodynamics, China Aerodynamics Research and Development Center, Mianyang 621000, China

  • Received Date: 03 Sep 2014
  • Rev Recd Date: 31 Oct 2014
  • Publish Date: 20 Jul 2015
    Abstract
  • The stability and transition of swept-wing boundary layers have important reference value to the design and optimization of airfoil. The sweep angle is one of the key parameters to the cross-flow instability of swept-wing boundary layers. Based on the NACA0012 airfoil profile, the mean flow of a swept-wing boundary layer was calculated by numerically solving the three-dimensional compressible Navier-Stokes equation, then the neutral curve and the growth curve of unstable Toumien-Schlisting wave were obtained by solving the Orr-Sommerfeld equation to study the effect of the sweep angle, and the transition position was predicted by applying eN method. Study shows that with the increase of sweep angle, both the strength of the cross-flow and the amplification factor n of the disturbance amplitude increase firstly and then decrease, and the strength of the cross-flow reaches its peak value when the sweep angle is in the range of 40° to 50°. The N factor predicted by eN method is the largest one when the sweep angle is about 50°, implying that with which angle, the induce disturbance with a smaller amplitude can easily lead to the occurrence of transition.

     

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