Measurement of eddy diffusivity of momentum in film cooling flows with streamwise injection

R. W. Kaszeta, Terrence W Simon

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37 Scopus citations


Measurements of mean velocity and turbulent shear stress are presented for the mixing region of a film cooling situation in which the coolant is streamwise injected with an injection angle of 35 deg. Measurements are performed using triple-sensor anemometry so that all three instantaneous velocity components are documented. The free-stream turbulence intensity level is 12 percent, the ratio of the integral length scale to injection hole diameter is 4.0, the coolant-to-mainstream momentum flux ratio is 1.0, and the density ratio is unity. From these measurements, values for the eddy diffusivities of momentum in the lateral and wall-normal directions are calculated. Additionally, calculated values of the ratio of eddy diffusivity in the spanwise direction to eddy diffusivity in the wall-normal direction are presented, which provide documentation of the anisotropy of turbulent transport in this film cooling flow.

Original languageEnglish (US)
Pages (from-to)178-183
Number of pages6
JournalJournal of Turbomachinery
Issue number1
StatePublished - Jan 1 2000


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