Book 2 - Axial Flow Compressors Flashcards
a set of rotors and a set of stators forms one _____
a set of rotors and a set of stators forms one STAGE
air in the compressor of an axial-flow compressor maintains uniform axial _________
air in the compressor of an axial-flow compressor maintains uniform axial VELOCITY
passages formed between the rotors and stators of an axial flow compressor are __________. velocity energy is converted into ________ and ___________
passages formed between the rotors and stators of an axial flow compressor are DIVERGENT. velocity energy is converted into PRESSURE and TEMPERATURE
the stators are angled to pass the air to the rotors at the correct _____ of attack
the stators are angled to pass the air to the rotors at the correct ANGLE of attack
each stage will increase the pressure by around 1.-1.:1 and temperature by approximately __ celsius
each stage will increase the pressure by around 1.1-1.2:1 and temperature by approximately 25 celsius
the diffuser is attached to the compressor ______ rear case. the compressed air flows into the diffuser and is ___________ and diffused (allowed to ______) which reduces the velocity and raises the ________ prior to entering the combustion chamber
the diffuser is attached to the compressor OUTLET rear case. the compressed air flows into the diffuser and is STRAIGHTENED and diffused (allowed to EXPAND) which reduces the velocity and raises the PRESSURE prior to entering the combustion chamber
the most simple type of axial flow compressor is the _______ spool type
the most simple type of axial flow compressor is the SINGLE spool type
an axial flow compressor has as many ______ as necessary to achieve the desired ________ ratio
an axial flow compressor has as many STAGES as necessary to achieve the desired PRESSURE ratio
to make engines more ________, and achieve higher pressure ratios, multi-______ compressors, each driven by their own _______ at optimum speed, were introduced
to make engines more EFFICIENT, and achieve higher pressure ratios, multi-SPOOLED compressors, each driven by their own TURBINE at optimum speed, were introduced
in some engines, the air from the LP compressor is split into ___ parts, only a percentage entering the __ compressor. both flows mix in the _______ system before passing into the propelling nozzle
in some engines, the air from the LP compressor is split into TWO parts, only a percentage entering the HP compressor. both flows mix in the EXHAUST system before passing into the propelling nozzle
the ratio of air that passes around the outside to that which passes through the HP compressor is known as the __-____ ratio and can be as high as _-1
the ratio of air that passes around the outside to that which passes through the HP compressor is known as the BY-PASS ratio and can be as high as 5:1
a ducted fan may be fitted to the front of twin-spool by-pass engines and the fan is driven at the same speed as the _________ to which it is fitted. very often the compressor to which the fan is fitted may be called a _________
a ducted fan may be fitted to the front of twin-spool by-pass engines and the fan is driven at the same speed as the COMPRESSOR to which it is fitted. very often the compressor to which the fan is fitted may be called a BOOSTER
on ______-spool engines, the fan is the LP compressor and is driven by an independent _______. a large proportion of the air, from the outer part of the fan, known as the ____-stream, by passes the other two compressors and is ducted to atmosphere through the cold stream ______. the ___ stream passes through the intermediate an HP compressors where it is further compressed before entering the __________ system
on TRIPLE-spool engines, the fan is the LP compressor and is driven by an independent TURBINE. a large proportion of the air, from the outer part of the fan, known as the COLD-stream, by passes the other two compressors and is ducted to atmosphere through the cold stream NOZZLE. the HOT stream passes through the intermediate an HP compressors where it is further compressed before entering the COMBUSTION system
compressor blades are sometimes free to ____ slightly when secured to relieve _____ concentration near the root
compressor blades are sometimes free to ROCK slightly when secured to relieve STRESS concentration near the root
rotor blades are of _________ section and are designed to give a ________ gradient along their length to ensure the air maintains a fairly uniform axial ________. the higher pressure at the tip balances out the ___________ action of the rotor on the airstream. to obtain these conditions, it is necessary to _____ the blade from root to top to give the correct angle of _________ at each point
rotor blades are of AEROFOIL section and are designed to give a PRESSURE gradient along their length to ensure the air maintains a fairly uniform axial VELOCITY. the higher pressure at the tip balances out the CENTRIFUGAL action of the rotor on the airstream. to obtain these conditions, it is necessary to TWIST the blade from root to top to give the correct angle of INCIDENCE at each point
