Journal of Thermal Science

, Volume 28, Issue 2, pp 340–353 | Cite as

Effect of Different Trench Lips on Downstream Film Cooling Effectiveness and Flow Fields

  • Rui Hou
  • Fengbo WenEmail author
  • Tao Cui
  • Xiaolei Tang
  • Songtao Wang


In the present study, the trenched configurations, including traditional trench (TT), fillet trench (FT) and varying-radius trench (VRT), are numerically investigated at different conditions in terms of downstream cooling effectiveness and flow fields. Different trench width and fillet radii are discussed at different blowing ratios and density ratios. Results show that the downstream lips mainly change the downstream pressure distributions and then change the lateral coolant distribution. The downstream fillet can reduce the penetration of coolant and improve laterally averaged effectiveness in the configurations with the narrow trench at modest blowing ratios. The enhancement of cooling effectiveness near the centerline plane is the positive effect of downstream fillet. This enhancement becomes more obvious with the increase of fillet radius, except for high blowing ratio. The fillet lip, compared with TT cases, also leads to a decline of coolant lateral spread for configurations with the wide trench and large radius, and more decline in the lateral direction deteriorates downstream overall cooling performance. Besides, the increase of density ratio contributes to a higher cooling effectiveness for fillet trench configurations. VRT cases guarantee the streamwise extension and lateral spread of coolant, therefore improving downstream cooling effectiveness further at blowing ratio M=1.0 and 1.5.


gas turbine film cooling trench hole cooling effectiveness 


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The authors acknowledge financial support from the Natural National Science Foundation of China (No. 51206034 and 51436002) and the Research Fund for the Doctoral Program of Higher Education of China (No. 20122302120066).


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Copyright information

© Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Rui Hou
    • 1
  • Fengbo Wen
    • 1
    Email author
  • Tao Cui
    • 1
  • Xiaolei Tang
    • 1
  • Songtao Wang
    • 1
  1. 1.School of Energy Science and EngineeringHarbin Institute of TechnologyHarbinChina

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