Unsteady heat transfer analysis of a film cooling flow

Sung In Kim, Ibrahim Hassan

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

7 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
Title of host publication46th AIAA Aerospace Sciences Meeting and Exhibit
Publication statusPublished - 2008
Externally publishedYes
Event46th AIAA Aerospace Sciences Meeting and Exhibit - Reno, NV, United States
Duration: 7 Jan 200810 Jan 2008

Other

Other46th AIAA Aerospace Sciences Meeting and Exhibit
CountryUnited States
CityReno, NV
Period7/1/0810/1/08

Fingerprint

Heat transfer
Cooling
Heat transfer coefficients
Flow structure
Unsteady flow
Blow molding
Coolants
Turbomachine blades
Flow fields
Boundary layers
Turbines
Hot Temperature

ASJC Scopus subject areas

  • Aerospace Engineering

Cite this

Kim, S. I., & Hassan, I. (2008). Unsteady heat transfer analysis of a film cooling flow. In 46th AIAA Aerospace Sciences Meeting and Exhibit [2008-1287]

Unsteady heat transfer analysis of a film cooling flow. / Kim, Sung In; Hassan, Ibrahim.

46th AIAA Aerospace Sciences Meeting and Exhibit. 2008. 2008-1287.

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

Kim, SI & Hassan, I 2008, Unsteady heat transfer analysis of a film cooling flow. in 46th AIAA Aerospace Sciences Meeting and Exhibit., 2008-1287, 46th AIAA Aerospace Sciences Meeting and Exhibit, Reno, NV, United States, 7/1/08.
Kim SI, Hassan I. Unsteady heat transfer analysis of a film cooling flow. In 46th AIAA Aerospace Sciences Meeting and Exhibit. 2008. 2008-1287
Kim, Sung In ; Hassan, Ibrahim. / Unsteady heat transfer analysis of a film cooling flow. 46th AIAA Aerospace Sciences Meeting and Exhibit. 2008.
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