Get Aircraft Propulsion Systems Technology and Design (Aiaa PDF

By Gordon C. Oates

A entire insurance of the major actual strategies that govern fuel turbine propulsion platforms. issues comprise combustion know-how, engine/airplane functionality matching, inlets and inlet/engine integration, variable convergent/divergent nozzle aerodynamics, and extra.

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Sample text

19) The first set of brackets contains the fan thrust, while the second set denotes the thrust resulting in the engine exhaust jet. Observe that E G represents the specific energy produced by the engine, while the amount BEF/rlFT is diverted to drive I/VF through the fan. The difference is the ideal energy of the engine jet. We use terms r/FN and t/E~vto represent the effects of the degradation of energy by the internal and external drag of the fan nacelle and nozzles, as well as that due to the weight of the added parts.

Except for possible Reynolds number effects, Fig. 16 also applies to various flight conditions. If the design point designates sea-level static conditions, the extreme right of curve C-C designates subsonic flights in the stratosphere, where the inlet temperatures are low. This operating point provides the highest specific power and best engine efficiency available in this example. Compressor stall and possibly surge is encountered again at supersonic flight speeds, where ETR is lowered at a given turbine inlet temperature because compressor inlet temperature is elevated.

Let us now calculate turbine work for this constant pressure ratio. Curves such as those of Fig. 13b are used; efficiency and pressure ratio determine ATr/Tr, I, which is plotted in Fig. 0. Curve A'-B' of Fig. 18 is the same as curve A-B of Fig. 17. o; AIRCRAFT PROPULSION SYSTEMS O "g o~nt 120~ 8 40 k___2 40 6O 8O %(wg Fig. 4 O/o( Vv) c Compressor pressure ratio and temperature rise. 5 is selected for the design pressure ratio of the turbine. We tentatively assume this to be unchanged even when the ETR is 64% of its design value.

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Aircraft Propulsion Systems Technology and Design (Aiaa Education Series) by Gordon C. Oates


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