The overall pressure ratio can be increased by improving fan (or) LP compressor pressure ratio or HP compressor pressure ratio. If the latter is held constant, the increase in (HP) compressor delivery temperature (from raising overall pressure ratio) implies an increase in HP mechanical speed. However, stressing considerations might limit this parameter, implying, despite an increase in overall pressure ratio, a reduction in HP compressor pressure ratio.
The overall pressure ratio can be increased by improving fan (or) LP compres.sor pressure ratio or HP compressor pressure ratio If the latter is held constant, the increase in (HP) compressor delivery temperature (from raising overall pressure ratio) implies an increase in HP mechanical speed However, stressing consid.erations might limit this parameter, implying, despite an increase in overall pressure ratio, a reduction in HP compressor pressure ratio.