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・ Zero-marking language
・ Zero-mode waveguide
・ Zero-ohm link
・ Zero-One United States Heavyweight Championship
・ Zero-order hold
・ Zero-order process (statistics)
・ Zero-phonon line and phonon sideband
・ Zero-player game
・ Zero-point energy
・ Zero-product property
・ Zero-profit condition
・ Zero-propellant maneuver
・ Zero-rated supply
・ Zero-rating
・ Zero-risk bias
Zero-stage
・ Zero-state solution
・ Zero-sum game
・ Zero-sum problem
・ Zero-suppressed decision diagram
・ Zero-symmetric graph
・ Zero-truncated Poisson distribution
・ Zero-turn mower
・ Zero-velocity surface
・ Zero-waste fashion
・ Zero-width joiner
・ Zero-width non-joiner
・ Zero-width space
・ Zero-X
・ Zero1


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Zero-stage : ウィキペディア英語版
Zero-stage

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:
w_2 = (w_2 \sqrt/P_3)
* (P_3/P_2)
* (\sqrt)
* (P_2/\sqrt) \,
where:
core mass flow = w_2 \,
core size =(w_2 \sqrt/P_3) \,
core total head pressure ratio = (P_3/P_2) \,

inverse of core total head temperature ratio = T_2/T_3 \, i.e. (P_3/P_2 \,)
core entry total pressure = P_2 \,
core entry total temperature = T_2 \,
So basically, increasing (P_3/P_2) \, increases w_2 \,.
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



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