Computational investigation of curvature effects on jet impingement heat transfer at internally cooled turbine vane leading edge regions

Research output: Contribution to journalArticle

Abstract

This study is carried out by using numerical simulations to investigate the effect of target surface curvature and the nozzle-to-target surface distance on the flow structure and heat transfer characteristics in a pin-finned double-wall cooling structure. The flow is directly impinging on the target surface and is disturbed by the pin fins, and then released from the film holes after passing the double-wall chamber. The ratio between the radius of the concave outer surface and the chord length of the concave outer surface is varied from 0.500 to 1.300 and the ratio between nozzle-to-target surface distance and diameter of impingement hole is ranging from 0.5 to 2.0. The Reynolds number is between 10,000 and 50,000. Results of the flow structure in the chamber, heat transfer on the target surface, and friction factor of the pin-fi nned channel are included. It is found that an increase of the target surface curvature has signifi cant effects on the flow structure and thus the heat transfer on the target surface is augmented. The Taylor-Görtler vortices near the pin fins are also influenced by the target surface curvature. On the other hand, the nozzle-to-target surface distance influences the jet impingement and the vortices, which are generated by the curvature, remarkably. It is found that the area goodness factor and volume goodness factor are improved by the surface curvature.

Details

Authors
Organisations
External organisations
  • Harbin Institute of Technology
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Fluid Mechanics and Acoustics

Keywords

  • Double-wall cooling structure, Flow structure, Friction factor, Heat transfer, Nozzle to target surface distance, Target surface curvature
Original languageEnglish
Pages (from-to)333-357
Number of pages25
JournalHeat Transfer Research
Volume51
Issue number4
Publication statusPublished - 2020
Publication categoryResearch
Peer-reviewedYes