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Jet engines are often uprated by adding a zero-stage to the front of a compressor.〔Hooker, Sir Stanley (1984). ''Not much of an Engineer'', P. 153. Airlife Publishing Ltd, Shewsbury, England ISBN 0906393353.〕 At a given core size, adding a stage to the front of the compressor not only increases the cycle overall pressure ratio, but increases the core mass flow. This is demonstrated by the following relationship: where: core mass flow = core size = core total head pressure ratio = inverse of core total head temperature ratio = i.e. () core entry total pressure = core entry total temperature = So basically, increasing increases . On the other hand, adding a stage to the rear of the compressor increases overall pressure ratio, decreases core size, but has no effect on core flow. This option also needs a Turbine with a significantly smaller flow capacity to drive the compressor. ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Zero-stage」の詳細全文を読む スポンサード リンク
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