NDLI: Effect of free-stream turbulence on film cooling

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Effect of free-stream turbulence on film cooling

Content Provider	NASA Technical Reports Server (NTRS)
Author	Tacina, R. R. Marek, C. J.
Copyright Year	1975
Description	Film-cooling experiments were conducted at four levels of free-stream turbulence to test the hypothesis that the film-cooling effectiveness is inversely related to the free-stream turbulence level. The hot-gas operating conditions were held constant at a temperature of 590 K, a pressure of 1 atmosphere, and a velocity of 62 m/sec. The film-cooling air was at ambient inlet temperature, and the film-cooling flow rates were 2.5, 5.0, 7.5, and 10.0 percent of the total airflow. Blockage plates with blockage areas of 0, 52, 72, and 90 percent were placed upstream of the film-cooling slot and produced axial turbulence intensities of 7, 14, 23, and 35 percent, respectively. The film-cooling effectiveness decreased as much as 50 percent as the freestream turbulence intensity was increased from 7 to 35 percent. The value of the turbulent mixing coefficient used in previous work was compared with the axial turbulence intensity. The turbulent mixing coefficient was found to be 10 to 40 percent of the axial turbulence intensity.
File Size	1047693
Page Count	29
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19750017021
Archival Resource Key	ark:/13960/t08w8659b
Language	English
Publisher Date	1975-06-01
Access Restriction	Open
Subject Keyword	Fluid Mechanics And Heat Transfer High Temperature Gases Film Cooling Combustion Chambers Free Flow Graphs Charts Axial Flow Turbulent Mixing Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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