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| '''T-stage'''s, sometimes called boost stages, are mounted on the low pressure (LP) shaft of some [[turbofan]] engines directly behind the fan. | | Oscar is how he's known as and he totally enjoys this name. For many years he's been working as a meter reader and it's something he really appreciate. To collect coins is what his family and him enjoy. Minnesota has usually been his std home test - [http://www.pornextras.info/user/G49Z click the following web page] - but his spouse desires them to transfer. |
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| T-stages are used to increase overall pressure ratio and, for a given core size, the core mass flow. This is demonstrated by the following relationship:
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| :'''<math>w_2 = (w_2 \sqrt{T_3}/P_3) * (P_2/\sqrt{T_2})* (P_3/P_2) / \sqrt{T_3/T_2} \,</math>''' | |
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| :where:
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| :core mass flow = '''<math>w_2 \,</math>'''
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| :core size = '''<math>(w_2 \sqrt{T_3}/P_3) \,</math>'''
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| :core entry total pressure = '''<math>P_2 \,</math>'''
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| :core entry total temperature = '''<math>T_2 \,</math>'''
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| :core total head pressure ratio = '''<math>P_3/P_2 \,</math>'''
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| :core total head temperature ratio = '''<math>T_3/T_2 \,</math>''' which varies more slowly than '''<math>P_3/P_2 \,</math>'''
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| :'''Note:'''
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| :in this case, the core refers to the whole of the gas generator compression, not just that of the high pressure (HP) compressor.
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| :The first two terms - before the second multiply - are constant. The value of the remainder of the expression increases as the core pressure ratio increases.
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| T-stages are a popular method for uprating the thrust of an engine (see, for example the [[Pratt & Whitney Canada PW500]]).
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| The alternative is to place a [[zero-stage]], mounted on the HP shaft, at the front of the HP compressor. This approach requires a significant change in the HP turbine, whereas a T-stage can, if necessary, be accommodated by simply adding an additional stage to the rear of the LP turbine.
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| Although T-stages usually only [[Supercharger|supercharge]] the core stream, some engines do feature a deliberately oversized intermediate pressure (IP) compressor, which compresses both the core flow and a proportion of the bypass flow. This enhances the stability of the T-stages during throttling. Where necessary, the alternative is to employ blow-off valves.
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| [[Category:Jet engines]]
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