Environmental and operational factors that influence the formation and deposition of corrosive species on hot section components in gas turbine engines are reviewed. In addition to air and fuel impurities, combustion gas chemistry, velocity, pressure and temperature are identified as key operational factors affecting the formation and deposition of Na2SO4 salt (the primary corrosive species) when trace amounts of sodium and sulphur are entrained into combustors. Test methods for ranking the resistance of different materials to hot salt corrosion are reviewed and compared in terms of the type of damage they produce. The methods considered range from a simple furnace or crucible test to burner rig and engine tests. It is shown that high velocity burner rigs, running at atmospheric pressure, allow all the relevant operational factors to be simulated, and they produce realistic hot corrosion damage similar to that observed on engine parts in service.
A review of factors controlling the gas turbine hot section environment and their influence on hot salt corrosion test methods
Eine Uebersicht ueber Faktoren, die die Umgebung des heissen Abschnitts von Gasturbinen und ihren Einfluss auf Heisssalzkorrosions-Testmethoden kontrollieren
High Temperature Technology ; 7 , 4 ; 173-186
1989
14 Seiten, 14 Bilder, 1 Tabelle, 80 Quellen
Article (Journal)
English
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