Unsteady heat transfer analysis of a film cooling flow

Sung In Kim, Ibrahim Hassan

Research output: Contribution to conferencePaper

6 Citations (Scopus)

Abstract

Unsteady heat transfer in a turbine blade film cooling flow is studied using detached eddy simulation (DES). Detailed computation of a single row of 35 degree round holes on a flat plate has been obtained for a blowing ratio of 1.0 and a density ratio of 2.0. The instantaneous flow fields and heat transfer distributions are found to be highly unsteady and oscillatory in nature. The fluctuation of the adiabatic effectiveness and heat transfer coefficient, for example, can be as high as 15 and 50 percent of the time-averaged value, respectively. The correlation between the coherent vortical structures and the unsteady heat transfer is carefully examined. It is shown that the fluctuations in the adiabatic effectiveness and heat transfer coefficient are mainly caused by the spanwise fluctuation of the coolant jet and the thermal turbulent boundary layer accompanying the unsteady flow structures.
Original languageEnglish
Number of pages12
Publication statusPublished - 2008
Event46th AIAA Aerospace Sciences Meeting and Exhibit - Reno, United States
Duration: 07 Jan 200810 Jan 2008

Conference

Conference46th AIAA Aerospace Sciences Meeting and Exhibit
CountryUnited States
CityReno
Period07/01/200810/01/2008

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  • Cite this

    Kim, S. I., & Hassan, I. (2008). Unsteady heat transfer analysis of a film cooling flow. Paper presented at 46th AIAA Aerospace Sciences Meeting and Exhibit, Reno, United States. http://arc.aiaa.org/doi/abs/10.2514/6.2008-1287