Analysis of film cooling with high-aspect-ratio holes: Heat transfer mechanisms

Hao Ming Li, Wahid Ghaly, Ibrahim Hassan

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A new advanced film cooling scheme, named high-aspectratio holes has been proposed. Four configurations were designed, and numerically simulated under density ratio of 2 and different blowing ratios. All configurations demonstrate extremely high film cooling effectiveness values, some are as high as the so-called perfect performance, while their mechanical strength are similar to the conventional schemes. The new scheme exhibits two traits distinctive from the conventional geometries: Its film cooling effectiveness is much higher than the coverage ratio (t/P), and the high film cooling effectiveness is obtained under strong counter-rotating vortex pair (CRVP). It has been found that, in the new scheme, along with the aspect ratio value increase, the CRVP move away from the coolantmainstream interface, and the coolant laterally expands in the vicinity of the exit. Consequently, a continuous coolant film would occur near the trailing edge position if aspect ratio is high enough. The approach of high-aspect-ratio holes could be used to design the highest film cooling performance geometries.

Original languageEnglish
Title of host publicationAerospace Heat Transfer; Computational Heat Transfer; Education; Environmental Heat Transfer; Fire and Combustion Systems; Gas Turbine Heat Transfer; Heat Transfer in Electronic Equipment; Heat Transfer in Energy Systems
PublisherAmerican Society of Mechanical Engineers
Volume1
ISBN (Electronic)9780791857885
DOIs
Publication statusPublished - 1 Jan 2017
EventASME 2017 Heat Transfer Summer Conference, HT 2017 - Bellevue, United States
Duration: 9 Jul 201712 Jul 2017

Other

OtherASME 2017 Heat Transfer Summer Conference, HT 2017
CountryUnited States
CityBellevue
Period9/7/1712/7/17

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ASJC Scopus subject areas

  • Mechanical Engineering
  • Condensed Matter Physics

Cite this

Li, H. M., Ghaly, W., & Hassan, I. (2017). Analysis of film cooling with high-aspect-ratio holes: Heat transfer mechanisms. In Aerospace Heat Transfer; Computational Heat Transfer; Education; Environmental Heat Transfer; Fire and Combustion Systems; Gas Turbine Heat Transfer; Heat Transfer in Electronic Equipment; Heat Transfer in Energy Systems (Vol. 1). American Society of Mechanical Engineers. https://doi.org/10.1115/HT2017-4796