Detailed Film Cooling Measurements on a Cylindrical Leading Edge Model: Effect of Free-Stream Turbulence and Coolant Density
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Detailed heat transfer coefficient and film effectiveness distributions were studied on a cylindrical leading edge model using a transient liquid crystal technique. Air and CO2 were used as coolants to simulate coolant-to-mainstream density ratio effect. The Nusselt numbers downstream of injection increases with increasing blowing ratio for both coolants. Air provides highest effectiveness at blowing ratio of 0.4 while CO2 at 0.8. CO2 provides lower Nusselt number at all blowing ratios compared to air. For both coolants, an increase in free-stream turbulence has small effect on the Nusselt number but significantly reduces the film effectiveness at low blowing ratios.
author list (cited authors)
Ekkad, S. V., Han, J., & Du, H.
complete list of authors
Ekkad, Srinath V||Han, Je-Chin||Du, Hui