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

By Gordon C. Oates

A complete assurance of the foremost actual ideas that govern fuel turbine propulsion structures. subject matters comprise combustion expertise, engine/airplane functionality matching, inlets and inlet/engine integration, variable convergent/divergent nozzle aerodynamics, and extra.

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This brief treatment indicates how loss data can be either presented or used in the design of gas turbine engines. This example was presented only to illustrate what is involved; other consistent systems can also be developed. Losses are often divided by a quantity associated with kinetic energy to form a loss coefficient. Quantities such as ~ V 2 or ( P - p) have been used AIRCRAFT PROPULSION SYSTEMS 54 M ~/= PA = +7M 2 . 4 Fig. 4 Flow rate and m o m e n t u m functions. as divisors. None of these completely eliminates the influence of Mach number on the loss, but ( P - p) seems to be as good as any.

C) Separated flow about an airfoil (from Prandtl). Fig. 34 Examples of flow about isolated bodies. 35d was taken a short time later. The disturbed flow in this view had just about reached the top of the cylinder. Right after this point in time, the eddy was washed downstream by the surrounding flow. The process was then more or less repeated over and over again. In general, the opposite sides of a cylinder take turns in generating and discarding eddies. The periodic shedding of vortices subjects the cylinder to an oscillating force.

The design differs from the turbojet in that the engine speed can be independently set by adjusting the propeller pitch. 1 - ~-"~ :~ 1 . 1 ~-'e) Turbine Fig. 19 Turbine match point. / \ \ / / \ J Fig. 20 Turbine engine with single shaft for turboprop. l is then known when the compressor inlet temperature is given. , Fig. 12) is thus established as an independent variable. A match point is defined on a compressor map by the intersection of the given corrected speed line with a line for a given ETR such as curve A-A in Fig.

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