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8/2/2019 1. TURBOMACHINES
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TURBOMACHINES
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TURBOMACHINE
streamoffluid,theenergytransferbeing
carriedoutbythedynamicactionofoneor
morerotat ng a erows.
e ynam cac ono ero a ng a erows
.
The
fluid
it
self
can
be
a
gas
or
a
liquid.
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TURBOMACHINE
propeller,windmills,waterwheels,hydraulic
turbines,andgasturbines.
TypeofTURBOMACHINES:
Workisdonebyfluid:Turbine,windmills,.
Workis
done
on
fluid:
Pump,
axial
compressor,
fan,blower.
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TURBOMACHINE
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TURBOMACHINE
Turbine:Amachinethatproducespowerbyexpandingacontinuouslyflowingfluidtoalowerpressureorhead,kW.
Pump:Amachinethatincreasethepressure(kPa)orhead(m)ofaflowingliquid.
continuouslyflowinggas,usuallywithadensityratioacrossthemachineoflessthan1.05suchthatthegasmaybeconsideredtobeincompressible;Pressurencrease susua yexpresse nmm 2 .
Compressor:Amachineimpartingalargepressurerisetoacontinuouslyflowing
as
with
a
densit
ratio
in
excess
of
1.05. Impeller:Therotatingmemberinacentrifugalpumporcentrifugalcompressor.
Runner:Therotatingmemberofaradialflowturbineorpump.
Rotor/disc:Therotatingmemberofanaxialflowgasorsteamturbine.
Diffuser:Apassagethatincreasesincrosssectionalareainthedirectionoffluid
theoutletofcompressor.
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TURBOMACHINE
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SPECIFICSPEED
usedforthegivenN,HandQ.
2/1
4/3ns=
where, n=rpm,Q=m3/s,H=m,ns =rpm
ns =rpm/53[rad]
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.
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SPECIFICSPEED
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SPECIFICSPEED
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PERFORMANCE
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PERFORMANCE
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CENTRIFUGALPUMP
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CENTRIFUGALPUMP
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CENTRIFUGALPUMP
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CENTRIFUGALPUMP
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CENTRIFUGALPUMP
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CENTRIFUGALPUMP
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CENTRIFUGALPUMP
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CENTRIFUGALPUMP
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CENTRIFUGALPUMP
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CENTRIFUGALPUMP
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CENTRIFUGALPUMP
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CENTRIFUGALPUMP
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CAVITATIONINPUMP
fallsbelowthevapourpressureoftheliquid
andtherebycausesvapourbublestoformin
t ema n o yo u ,t at st e qu o s.
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CAVITATIONINPUMP ,
=