NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Analysis of Turbine Blade Relative Cooling Flow Factor Used in the Subroutine Coolit Based on Film Cooling CorrelationsHeat transfer correlations of data on flat plates are used to explore the parameters in the Coolit program used for calculating the quantity of cooling air for controlling turbine blade temperature. Correlations for both convection and film cooling are explored for their relevance to predicting blade temperature as a function of a total cooling flow which is split between external film and internal convection flows. Similar trends to those in Coolit are predicted as a function of the percent of the total cooling flow that is in the film. The exceptions are that no film or 100 percent convection is predicted to not be able to control blade temperature, while leaving less than 25 percent of the cooling flow in the convection path results in nearing a limit on convection cooling as predicted by a thermal effectiveness parameter not presently used in Coolit.
Document ID
20150011643
Acquisition Source
Glenn Research Center
Document Type
Technical Memorandum (TM)
Authors
Schneider, Steven J.
(NASA Glenn Research Center Cleveland, OH United States)
Date Acquired
June 26, 2015
Publication Date
June 1, 2015
Subject Category
Spacecraft Propulsion And Power
Report/Patent Number
E-19070
GRC-E-DAA-TN20944
NASA/TM-2015-218738
Funding Number(s)
WBS: WBS 475122.02.03.02.02
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Keywords
Air cooling
Axial flow turbines
Turbine blades
No Preview Available