D
–EIMAC00708-16EN - 56/76
1. and 2. Suction
Main rotor flutes 'a', 'b' and 'c' are in
communication at one end with the suction
chamber via the bevelled rotor end face, and
are sealed at the other end by the star rotor
teeth. As the main rotor turns, the effective
length of the flutes increases with a
corresponding increase in the volume open to
the suction chamber: Diagram 1 clearly
shows this process. As flute 'a' assumes the
position of flutes 'b' and 'c' its volume
increases, inducing suction vapour to enter
the flute.
Upon further rotation of the main rotor , the
flutes which have been open to the suction
chamber engage with the star teeth. This
coincides with each flute being progressively
sealed by the main rotor. Once the flute
volume is closed off from the suction chamber,
the suction stage of the compression cycle is
complete.
1.
2.
3. Compression
As the main rotor turns, the volume of gas
trapped within the flute is reduced as the
length of the flute shortens and compression
occurs.
3.
4. Discharge
As the star rotor tooth approaches the end of
a flute, the pressure of the trapped vapour
reaches a maximum value occurring when the
leading edge of the flute begins to overlap the
triangular shaped discharge port.
Compression immediately ceases as the gas
is delivered into the discharge manifold. The
star rotor tooth continues to scavenge the flute
until the flute volume is reduced to zero. This
compression process is repeated for each
flute/star tooth in turn.
4.
Oil separator not shown
Figure 29
– Compression process
c
a
b
c
b
a
c
a
b
c
b
a
a
Discharge
Gas
b
a
b
Suction
Gas
b
a
c
Содержание ERAD 120E-SL
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