Aircraft Performance and Design by Anderson PDF

By Anderson

Written by means of essentially the most capable aerospace authors, this new ebook develops plane functionality recommendations from first rules and applies then to genuine airplanes. It additionally deal with a philosophy of, and strategies for airplane layout. via constructing and discussing those topics in one textual content, the writer captures a level of synergism now not present in different texts. The publication is written in a conversational kind, a hallmark of all of john anderson's texts, to augment the readers' figuring out.

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5, (00TcTt- 1), M7 = y--1 2 and from the definition of 00, -- Mo 2 = y (00 - 1), -1 2 Tb(OOTcTt - 1) 00 - 1 The thrust of the turbojet is then given by F F mao -= = mu o(u7/UO - 1) or (2. 6) Chapter 2 38 This expression is not yet complete, as we must recognize that the power of the turbine equals that of the compressor. Since it is assumed here that the fuel mass flow is negligible relative to the air flow, and that the specific heat of the working fluid is constant, this condition can be written as mCp('1;3 - '1;2) = mCp('1;4 - '1;5)' Because the absolute magnitude of '1;4 is generally limited by the tempera­ ture and stress capabilities of the materials or by the cooling technology, it is useful to define a dimensionless temperature that represents this limita­ tion.

If the downstream closure of the control volume had been placed far downstream, where Pe -+ Po, the latter contribution would have been zero; but then the analysis of engine performance would have to include an analysis of the mixing of the exhaust jet with the external flow, so as to arrive at the velocity over the downstream plane. Placing the closure plane at the engine exit eliminates this problem. It introduces another problem, however: The difference between P on Sb and Po can be affected by the engine exhaust.

The corresponding specific impulse and the compressor pressure ratio required to achieve these values are also given. 4. Here the peaking of thrust as a function of compressor temperature ratio, at lower values as the Mach number increases, is quite clear. It can also be seen, however, that the peak is quite broad. For low flight Mach numbers there is very little difference between the thrust produced at a compressor tem­ perature ratio of 2 and the thrust produced at the optimum temperature ratio, which is near 3.

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Aircraft Performance and Design by Anderson


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