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Trends in Technological Innovation 37 useful at temperatures higher than temperatures at which aluminum can be used and offer substantial weight savings over pure titanium or nickel-based alloys, making them good candidates for combustor cases, compressor blades in the last (highest pressure and tempera- ture) stages, and other such applications. Similarly, nickel alu- minides and niobium intermetallics exhibit higher temperature ca- pabilities than do nickel-based superalloys, making them good can- didates for future turbine airfoils (St. Peter, 1999, p. 415). However, these materials’ properties (e.g., ductility) are still being assessed and manufacturing processes are still being refined. Continued research and development will likely solve any remaining issues, and inter- metallics should enjoy an increasing presence in future engines. SUMMARY Jet engine design, production, operation, and support are complex activities. The design of safe, affordable, and reliable jet engines re- quires the integration of many technical disciplines, including aero- dynamics, thermodynamics, fluid mechanics, solid mechanics, ma- terials development, fuels research, combustion systems design, heat transfer analysis, and controls development. The resulting jet en- gines are complex devices that test the finite capabilities of each of these technical disciplines. Additionally, the operation and support of these engines and the aircraft they power require various profes- sional skills, including skills in propulsion systems usage, mainte- nance, contracting, supply management, and many other areas. This chapter provided basic information on how jet engines work, the parameters used to compare the performance of different jet en- gines, development process alternatives, and likely future trends in jet engine technologies. This information will help program man- agers and cost analysts to employ the cost-estimating relationships described later in this report and should facilitate discussions about jet engines and the related factors that influence the costs associated with them.PDF Image | Military Jet Engine Acquisition Technology Basics and Cost-Estimating Methodology
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