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Title: Airfoil cooling hole plugging by combustion gas impurities of the type found in coal derived fuels

Abstract

Film cooled airfoils were heated in the Mach 0.3 combustion gases of a burner rig. The flame temperature was varied but the initial leading edge temperature of the airfoil was cooled to 815/sup 0/ C by air whose pressure was then fixed for the duration of the run. The combustion gases were doped with a combination of Fe, Pb, Ca, Na, K, and P at ratios similar to those found in Solvent Refined Coal but at higher total concentrations. Cooling hole plugging was monitored by the observed increase in leading edge temperature. As the air mass flow ratio (coolant/hot gas) increased beyond a minimum, which was a function of the deposit chemistry, the tendency for plugging decreased. The flow rates needed to substantially reduce plugging were quite high, indicating a potential problem for gas turbines operating on coal-derived fuels.

Authors:
;
Publication Date:
Research Org.:
National Aeronautics and Space Administration, Cleveland, OH (USA). Lewis Research Center
OSTI Identifier:
6167746
Report Number(s):
DOE/NASA/2593-79/1; NASA-TM-79076
DOE Contract Number:  
EF-77-A-01-2593
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 01 COAL, LIGNITE, AND PEAT; COOLING SYSTEMS; PLUGGING; FUEL GAS; IMPURITIES; GAS TURBINES; COOLING; COAL GASIFICATION; DEPOSITS; IRON COMPOUNDS; LEAD COMPOUNDS; PHOSPHORUS COMPOUNDS; POTASSIUM COMPOUNDS; SODIUM COMPOUNDS; ALKALI METAL COMPOUNDS; ENERGY SOURCES; FLUIDS; FUELS; GAS FUELS; GASES; GASIFICATION; THERMOCHEMICAL PROCESSES; TRANSITION ELEMENT COMPOUNDS; TURBINES; TURBOMACHINERY; 421000* - Engineering- Combustion Systems; 010600 - Coal, Lignite, & Peat- Properties & Composition

Citation Formats

Deadmore, D.L., and Lowell, C.E. Airfoil cooling hole plugging by combustion gas impurities of the type found in coal derived fuels. United States: N. p., 1979. Web.
Deadmore, D.L., & Lowell, C.E. Airfoil cooling hole plugging by combustion gas impurities of the type found in coal derived fuels. United States.
Deadmore, D.L., and Lowell, C.E. Thu . "Airfoil cooling hole plugging by combustion gas impurities of the type found in coal derived fuels". United States.
@article{osti_6167746,
title = {Airfoil cooling hole plugging by combustion gas impurities of the type found in coal derived fuels},
author = {Deadmore, D.L. and Lowell, C.E.},
abstractNote = {Film cooled airfoils were heated in the Mach 0.3 combustion gases of a burner rig. The flame temperature was varied but the initial leading edge temperature of the airfoil was cooled to 815/sup 0/ C by air whose pressure was then fixed for the duration of the run. The combustion gases were doped with a combination of Fe, Pb, Ca, Na, K, and P at ratios similar to those found in Solvent Refined Coal but at higher total concentrations. Cooling hole plugging was monitored by the observed increase in leading edge temperature. As the air mass flow ratio (coolant/hot gas) increased beyond a minimum, which was a function of the deposit chemistry, the tendency for plugging decreased. The flow rates needed to substantially reduce plugging were quite high, indicating a potential problem for gas turbines operating on coal-derived fuels.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1979},
month = {2}
}

Technical Report:
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