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32 Military Jet Engine Acquisition due to the extraordinary forces, temperatures, acoustic vibrations, and other elements to which the nozzles are exposed and the limited “signatures” that they are allowed to produce. Although several de- sign approaches have been explored in the laboratory and on exper- imental flight-test aircraft, the F-22’s F119-100 engine will have the first production thrust-vectoring nozzle. The Air Force and Pratt & Whitney have worked hard to control the cost and complexity of these nozzles. However, there is still opportunity to enhance afford- ability, maintainability, and simplicity in future-generation mechan- ical thrust-vectoring nozzles. Fluidic Nozzles for Afterburning Thrust-Vectoring Engines Fixed-geometry fluidic nozzles are an attractive alternative to me- chanical thrust-vectoring nozzles. These devices would selectively inject small jets of air or sheets of high-pressure air (bled from the compressor) into the nozzle’s main flow stream to change the noz- zle’s flow area and direct the thrust as needed. Because fluidic noz- zles would not have any moving parts in direct contact with the hot exhaust jet, they should eventually be much cheaper to design, pro- duce, and maintain. However, this challenging technology is in its formative stages and will likely take several years to mature. Integral Starter-Generators and Electric Actuators Alternators on an aircraft’s main engines produce the majority of the electrical power for the engine’s controls and for the aircraft’s avionics, lighting, and other systems.3 These alternators are an inte- gral part of the power-takeoff assembly, which is driven by a power- takeoff shaft geared to the engine’s low- or high-pressure spool. This power-takeoff assembly adds to the engine’s weight, complexity, part count, and requirements for lubrication. The engine community is designing alternators that will be manufactured as an integral part of one of the engine’s spools. ______________ 3Electrical power is also provided by the aircraft’s auxiliary power unit (APU) and batteries. When the aircraft is on the ground and the engines are not operating, the aircraft’s APU, batteries, and/or a separate ground power source provide all the aircraft’s electrical power.PDF Image | Military Jet Engine Acquisition Technology Basics and Cost-Estimating Methodology
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