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

By Gordon C. Oates

A entire assurance of the major actual strategies that govern gasoline 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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22, this would be true at overall pressure ratios above about 6. At lower overall pressure ratios, the percent rate o f change in speed is greater for the outer unit until the inner turbine is also unchoked. The variation in turbine power with the overall Pressure ratio is seen to be dependent on where the turbine is located in the gas stream. 23 indicates that the outer compressor of a two-shaft engine operates near its surge line at 70% of the design corrected speed. Recall that this phenomenon was also observed in Fig.

23) and this match point is spotted on Fig. 25 in order to estimate the corrected speed of the outer unit. A curve similar to Fig. 25 for the pressure ratio enables this quantity to be estimated. l)OUT with the corrected turbine speed can be found by using the scheme applied to Fig. 19. Performance trends. z calculated from the data at the design point, we can again estimate where the compressors operate during various off-design conditions. The curves CAB in Fig. 23 are somewhat representative, although this example (which happens to be the only one readily available) represents the case where the engine nozzle area is varied to maintain the outer unit at a constant mechanical speed.

Similarly, the discussion of nozzle aerodynamics in Chapter 5 has many features that are applicable to turbines. The ignition and stability of combustors are not always predictable and satisfactory results must be demonstrated under the conditions they would experience during the given flight envelope. Chapter 2 of this volume as well as Chapters 1 and 2 of Ref. 2 survey the problems involved. There is need for mutual understanding and cooperation among all designers and developers of these components.

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