Volume 33 Issue 9
Sep.  2018
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Coherent structures of cascade under different attack angles with DMD method[J]. Journal of Aerospace Power, 2018, 33(9): 2150-2160. doi: 10.13224/j.cnki.jasp.2018.09.012
Citation: Coherent structures of cascade under different attack angles with DMD method[J]. Journal of Aerospace Power, 2018, 33(9): 2150-2160. doi: 10.13224/j.cnki.jasp.2018.09.012

Coherent structures of cascade under different attack angles with DMD method

doi: 10.13224/j.cnki.jasp.2018.09.012
  • Received Date: 2017-05-09
  • Publish Date: 2018-09-28
  • In order to analyze the characteristics of coherent structures of unsteady flow in a cascade separation flow, the large eddy simulation of single channel cascade with three different attack angles was carried out. Moreover, dynamic mode decomposition was made to analyze the inherent structures of the three different operations. With DMD(dynamic mode decomposition) method, the complex temporal-spatial flow fields can be decoupled and the coherent structures of different frequencies and scales can be captured. Besides, the main frequencies and their structures can be got to reflect the main dynamic behavior. Moreover, with DMD method, thousands of different flow fields can be expressed by low dimension of only dozens of modes. With the application of DMD method, the results showed that instability shear vortex was generated by flow separation of the leading edge of the cascade, coupling with the shedding vortex in the wake zone, producing new coherent structure. When the attack angle became larger, the shear vortex and its interaction with shedding vortex were strengthened, making the flow field more complicated.

     

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