High-Temperature Fatigue/Creep/Environment Interactions in Compressor Alloys

The high-temperature fatigue response of titanium and nickel alloys destined for high-performance gas turbine applications is considered with particular emphasis given to the role of creep and environmental damage during crack growth. In an attempt to partition the respective contributions from these two rate controlling factors, data are presented for a range of temperature, stress ratio, and pressure conditions. The implications for the extended use of such alloys in future gas turbine designs are discussed.

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High Temperature Fatigue/Creep/Environment Interactions in Compressor Alloys

Volume 4: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education; IGTI Scholar Award ◽

10.1115/2001-gt-0477 ◽

2001 ◽

Author(s):

W. John Evans ◽

J. Paul Jones ◽

Martin R. Bache

Keyword(s):

High Temperature ◽

Gas Turbine ◽

Crack Growth ◽

Nickel Alloys ◽

High Performance ◽

Stress Ratio ◽

Controlling Factors ◽

Environmental Damage ◽

High Temperature Fatigue

The high temperature fatigue response of titanium and nickel alloys destined for high performance gas turbine applications is considered with particular emphasis given to the role of creep and environmental damage during crack growth. In an attempt to partition the respective contributions from these two rate controlling factors, data are presented for a range of temperature, stress ratio and pressure conditions. The implications for the extended use of such alloys in future gas turbine designs are discussed.

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The Role of the Recuperator in High Performance Gas Turbine Applications

Volume 1A: General ◽

10.1115/78-gt-46 ◽

1978 ◽

Author(s):

C. F. McDonald

Keyword(s):

High Temperature ◽

Heat Exchanger ◽

Gas Turbine ◽

Gas Turbines ◽

High Performance ◽

Waste Heat ◽

Closed Cycle ◽

Exhaust Waste Heat ◽

Prime Movers

With soaring fuel costs and diminishing clean fuel availability, the efficiency of the industrial gas turbine must be improved by utilizing the exhaust waste heat by either incorporating a recuperator or by co-generation, or both. In the future, gas turbines for power generation should be capable of operation on fuels hitherto not exploited in this prime-mover, i.e., coal and nuclear fuel. The recuperative gas turbine can be used for open-cycle, indirect cycle, and closed-cycle applications, the latter now receiving renewed attention because of its adaptability to both fossil (coal) and nuclear (high temperature gas-cooled reactor) heat sources. All of these prime-movers require a viable high temperature heat exchanger for high plant efficiency. In this paper, emphasis is placed on the increasingly important role of the recuperator and the complete spectrum of recuperative gas turbine applications is surveyed, from lightweight propulsion engines, through vehicular and industrial prime-movers, to the large utility size nuclear closed-cycle gas turbine. For each application, the appropriate design criteria, types of recuperator construction (plate-fin or tubular etc.), and heat exchanger material (metal or ceramic) are briefly discussed.

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