Volume 35 Issue 11
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LI Zhenpeng, FU Chao. Study on opposed mixing flow in circumferential intake[J]. Journal of Aerospace Power, 2020, 35(11): 2385-2399. doi: 10.13224/j.cnki.jasp.2020.11.016
Citation: LI Zhenpeng, FU Chao. Study on opposed mixing flow in circumferential intake[J]. Journal of Aerospace Power, 2020, 35(11): 2385-2399. doi: 10.13224/j.cnki.jasp.2020.11.016
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Study on opposed mixing flow in circumferential intake

doi: 10.13224/j.cnki.jasp.2020.11.016
  • 1.

    School of Energy and Power Engineering,Beijing University of Aeronautics and Astronautics,Beijing 100191,China

  • 2.

    National Key Laboratory of Science and Technology on Aero-Engine,Aero-thermodynamics,School of Energy and Power Engineering,Beijing University of Aeronautics and Astronautics,Beijing 100191,China

  • 3.

    National Key Laboratory of Science and Technology on Aero-Engine,Aero-thermodynamics,School of Energy and Power Engineering,Beijing University of Aeronautics and Astronautics,Beijing 100191,China

  • 4.

    Research Institute of Aero-Engine,Beijing University of Aeronautics and Astronautics,Beijing 100191,China

  • Received Date: 2020-03-31
  • Publish Date: 2020-11-28
    Abstract
  • For studying the structures of opposed mixing flow at the outlet of radial centripetal turbine,large eddy simulation was used to simulate the convective mixing flow of the circumferential intake. Flow structures in different modes were extracted and analyzed by the proper orthogonal decomposition (POD) method. The results showed that there existed stagnation zone near the bottom center and a recirculation zone near both sides of the wall,and the flow was approximately symmetrical at the horizontal cross section. The instability of the vortex structure was strengthened due to the effect of the shear force along the streamwise direction. Furthermore,the upstream three-dimensional vortex ring structure was stretched and expanded,breaking into a complex vortex braid or hairpin vortex structure,which enhanced the mixing,and also the momentum and energy exchanged between the fluids. The POD results showed that the first mode had the highest energy weight,indicating that most of the energy in the pulsating field was concentrated in this mode,and the flow structure in this mode acted as the main flow structure.

     

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