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二战飞机手册 b-24-manual-part-3

ID：32806

阅读量：3

大小：12.83 MB

页数：17页

时间：2023-01-29

金币：50

上传者：战必胜
DO YOU
KNOW
YOUR POWER
The supercharged
power
plant
of the
modern
airplane
is indeed a complex
machine.
With
automatic
devices
such as constant
speed
pro-
pellers,
electronic
supercharger
controls,
and
carburetors
for controlling
fuel-air
mixtures,
it
is a far cry
from the
aircraft engine
of
20
years
ago.
In this
discussion of
its operation,
it is essen-
tial
first to consider the
power
plant
as a whole,
since
when
one factor
in
the
intricate system
changes, other
factors-even those apparently
remote-may also be
afiected.
For
clarity's
sake,
the discussion
will deal chiefly with the
elec-
tronic
turbo-supercharger
control, rather than
the early type with oil
regulated control.
To
gain
a
better understanding of the oper-
ation
of
a supercharged engine, and thus
help
clear up the existing confusion
about manifold
pressure
and its influence on engine
perform-
ance, 1et us first consider the accompanying
diagram. It
shows the
location of
,the
various
parts
of the
power plant
which afiect manifold
pressure
during
the complete cycle of opera-
RESTRICTED
RESTRICTED
PTANT?
tion, and shows
how
all factors work together
to
produce
the
manifold
pressure
indicated on
the
instrument
panel.
The first unit
in
the cycle
is the air filter.
This
removes dust
and fine sand
from
the air
enter-
ing
the
power plant, preventing
the
rapid wear
such
grit
would cause on
moving engine
parts.
A slight drop
in
pressure
results
from
the
pas-
sage of air through the
filter, but rvhen
the
turbo control
is working the turbo compressor
rpm is increased to cornpensate
for the
drop.
At high altitudes,
however,
you
should trrrn
the
filters off, or the
turbine will
reach
over-
speed at
a lower altitude than
normal.
Next is the turbo-driven compressor.
The
amount of
pressure
boost
it delivers
depends
upon
its rpm
and
upon
inlet
pressure.
Four
factors
afiect
the rpm of this
unit: Exhaust
pres-
sure
in the turbine nozzle box; exhaust
gas
temperature;
atmospheric
pressure
and temper-
ature,
and
quantity
of
air flow through the
compressor.
Leaving
the compressor,
air
passes
through
t05
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