ANALYSIS OF FILM COOLING WITH HIGH-ASPECT-RATIO HOLES: HEAT TRANSFER MECHANISMS Conference Paper uri icon

abstract

  • A new advanced film cooling scheme, named high-aspect-ratio 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 coolant-mainstream 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.

name of conference

  • Volume 1: 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

published proceedings

  • PROCEEDINGS OF THE ASME SUMMER HEAT TRANSFER CONFERENCE, 2017, VOL 1

author list (cited authors)

  • Li, H., Ghaly, W., & Hassan, I.

complete list of authors

  • Li, Hao-Ming||Ghaly, Wahid||Hassan, Ibrahim

publication date

  • January 1, 2017 11:11 AM