Volume 37 Issue 3
Mar.  2022
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Article Navigation >  Journal of Aerospace Power  > 2022  >  37(3): 492-501
WANG Hai, FAN Fangsu, PU Jian, WANG Jianhua, LIU Minghou, WANG Chunhua, LU Haiying. Flow and heat transfer characteristics of round-hole film cooling with crater[J]. Journal of Aerospace Power, 2022, 37(3): 492-501. doi: 10.13224/j.cnki.jasp.20210174
Citation: WANG Hai, FAN Fangsu, PU Jian, WANG Jianhua, LIU Minghou, WANG Chunhua, LU Haiying. Flow and heat transfer characteristics of round-hole film cooling with crater[J]. Journal of Aerospace Power, 2022, 37(3): 492-501. doi: 10.13224/j.cnki.jasp.20210174
shu

Flow and heat transfer characteristics of round-hole film cooling with crater

doi: 10.13224/j.cnki.jasp.20210174
  • 1.

    Department of Thermal Science and Energy Engineering，University of Science and Technology of China，Hefei 230027，China

  • 2.

    Shenyang Engine Research Institute，Aero Engine Corporation of China，Shenyang 110015，China

  • 3.

    College of Energy and Power Engineering，Nanjing University of Aeronautics and Astronautics，Nanjing 210016，China

  • 4.

    Aero Engine Academy of China，Aero Engine Corporation of China，Beijing 101304，China

  • Received Date: 2021-04-15
  • Publish Date: 2022-03-28
    Abstract
  • The interaction between the mainstream and coolant flow from the crater hole on flat plate was studied by large eddy simulation method，and the film-cooling enhancement mechanism of crater hole was revealed.The simulation results were compared with the experimental results by infrared thermal imaging test and particle image velocimetry.The results showed that the crater hole generated a pair of anti-kidney vortices downstream the coolant exit，promoted the entrainment of coolant towards the wall and improved the coolant coverage.Compared with round hole，large-scaled coherent structures including hairpin vortices and horseshoe vortices can also be observed in crater-hole flow fields.However，different from round-hole，the concave effect on the trailing edge of crater generated parallel lines of hairpin vortices，presenting better stability at high blowing ratio.The time-frequency analysis of pressure fluctuation signals showed that the periodicity of crater-hole film cooling was weaker，and the small-frequency vortices played a dominant role.Overall，crater improved the lateral spreading of coolant jet，and its cooling performance was better than round-hole.

     

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