1. TURBOMACHINES

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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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 ,

=

1. TURBOMACHINES

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