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Book Details :
Published on: 2015-11-26
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Original language: English

Excerpt from The Gas Turbine, an Internal Combustion Prime-MoverHowever, the method in which a cycle is carried out is as im portant as the form of cycle. Losses not taken account of by theory always occur. And the magnitude of these depends only on the mechanism of the heat engine which executes the cycle. We must carry out the Brayton cycle in an actual engine without in curring greater losses than occur in an Otto gas engine in order to secure better results. In all actual attempts to execute the Brayton cycle in the past the losses have been so serious as to more than outweigh the theoretical advantages. On paper, at least, the gas turbine avoids these losses, as we shall see in Chap.3.Let us next consider how the Brayton cycle is carried out by the gas turbine, which, as has been stated, is the equivalent of the compressor-motor combination already discussed. In the case of the compressor-motor combination the compressed air was supposed to be heated by being passed through a vessel exposed to an outside flame. In the gas turbine there is substituted for this internal combustion, used so successfully in the modern gas engine. Since air is our original working substance and since it is also requisite for the combustion of the fuel used in the heating, we may use the air which is to operate the motor to support the combustion of the fuel. That is to say, we will heat the air for the motor by burning the fuel right in it. This is called inter nal combustion, as distinguished from external combustion, where the heat of the fuel is transferred through the walls ofa vessel to the working substance, as in the case of a steam boiler. The air must be heated between the compressor and motor, when it is under considerable pressure. A closed vessel or enlargement of the pipe between the compressor and motor is provided, called the combustion chamber.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
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