General Electric Company

The United States of America As Represented by the Administrator of the

Frederick J Sellers

John Frederick Ackerman

George A Coffinberry

Kevin Richard Leamy

George W Bennett

Richard S Beitler

A fluid containment article that exhibits a reduced tendency for thermal decomposition products to deposit and adhere to its surface in contact with a hydrocarbon fluid, such as a hydrocarbon fuel, at elevated temperatures. Deposition and adhesion of thermal decomposition products are avoided by tailoring both the composition and surface finish of the surface contacting the hydrocarbon fluid. Preferred characteristics are achieved by appropriately preparing the surface of the article to have a surface roughness characterized by an R.sub.max of up to about 0.4 micrometer, and then depositing an oxide coating on the surface using a deposition process that yields a coating consisting essentially of a metal oxide and the vapors of an organometallic compound used in the deposition process. The oxide coating is directly deposited on the surface of the article, and therefore does not employ an adhesion-promoting layer of the type conventionally used by the prior art to promote adhesion of a metal oxide layer on a metal substrate.

Fluid containment article for hot hydrocarbon fluid and method of

Clearance control means is provided for a gas turbine engine. In one embodiment relating to compressor blade clearance, means is provided for developing a first signal representative of the actual compressor casing temperature, a second signal representative of compressor inlet gas temperature, and a third signal representative of compressor speed. Schedule means is provided for receiving the gas temperature and compressor speed signals and developing a schedule output signal. The schedule output signal is representative of a reference casing temperature at which a predetermined compressor blade stabilized clearance is provided. Means is provided for comparing the actual compressor casing temperature signal and the reference casing temperature signal and developing a clearance control signal representative of the difference therebetween. The clearance control signal is coupled to a control valve which controls a flow of air to the compressor casing to control the clearance between the compressor blades and the compressor casing. Means is provided for modification of the clearance control signal to accommodate transient characteristics. Other embodiments are disclosed.

Control means for a gas turbine engine

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Cincinnati, OH, United States of America

Frederick J Sellers