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Purdue University

Purdue e-Pubs

International Compressor EngineeringConference

School of Mechanical Engineering

1976

Calculation and Design of the Fly Wheel for Smalland Medium Compressors

L. Boswirth

E. Boff

This document has been made available through Purdue e-Pubs, a service of the Purdue University Libraries. Please contact epubs@purdue.edu for

additional information.

Complete proceedings may be acquired in print and on CD-ROM directly from the Ray W. Herrick Laboratories at https://engineering.purdue.edu/

Herrick/Events/orderlit.html

Boswirth, L. and Boff, E., "Calculation and Design of the Fly Wheel for Small and Medium Compressors" (1976).InternationalCompressor Engineering Conference. Paper 193.http://docs.lib.purdue.edu/icec/193

http://docs.lib.purdue.edu/http://docs.lib.purdue.edu/icechttp://docs.lib.purdue.edu/icechttp://docs.lib.purdue.edu/mehttps://engineering.purdue.edu/Herrick/Events/orderlit.htmlhttps://engineering.purdue.edu/Herrick/Events/orderlit.htmlhttps://engineering.purdue.edu/Herrick/Events/orderlit.htmlhttps://engineering.purdue.edu/Herrick/Events/orderlit.htmlhttp://docs.lib.purdue.edu/mehttp://docs.lib.purdue.edu/icechttp://docs.lib.purdue.edu/icechttp://docs.lib.purdue.edu/

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Data: the quantity delivered: 5 .8m3/m in pressure: 9 bar(abs)power consumption Pe=38 .4kW speed n=l500 rpm

According to th e size of th e machine we es t i-mate the mechan ical efficiency to n h=0.9b ( D4-d4 )When we choose D=0.6m and use 9=7300kg/m3 forcasting we geta)symme tric arrangemen t b ) a s ~ ~ e t r i c arr

b=7.5cm m"" 47.4 kg b = 5 .5 cm m=36 kgconsidering the fact that the ring needsonly 90% of th e calculated ine rtia momen t.For the asymmetr ic arrangemen t we save 11.4 kg casting without any change in th e coefficient of cyclic i ~ t iThe computer program f i ts for any cylinderand stage ar rang emen t. But iti s only reasonable to table k values for widespread types.For special types separate calculations mustbe done. The computer program is also adaptable for piston pumps.Literature[Jl FRENKEL ,M .I.: "Kolbenverdichter" Berlin /

1969.[2]KtiTTNER ,K .-H .: "Kolbenmaschinen" Stuttgar "l j. .

1967. [3] .Bi:iSWIRTH,L.:"Das Schwungrad kleiner und mi t t le re r Kompresaoren" .Journal "druckluftpraxis" 5(19 73),Heft 4.I>la in z.

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TABLE 1k-valu es for the calculation of th e flywheel. Electric driven compressors or compressorsdri ven by motors with uniform torque at coupling. k in kg.m 2/kW.min.Suction pressure lbar .@paralle l cylinders

Cylinder- and : ltage ar rangement- - - - - - - - - - - - - - ~ ~ - - ~ - - - ~ T-Tressure bar(abs) 7 11(container }1 0 - ~ 3.8 1 ! 4.20 4.6 5

(v 1 90 0)V-type compressors -ang e

Cylinder- andstage arrangemen

pressure bar(abs10-6k

1 stage

-- - - - ~ - - - - - - - - - - - - -

1 I 9I 112.96 '3 .14 3-34c W-type compressors(W-angle 2x 60)

1 stageCylinder - andstage ar rangemen t

1 I

2 cylinders l s t stage~ -----I

7 9 11

0.81 1.05 1.29

2 stages/ /

] [ I

7 9 113-46 3.3 7 3-32

2 stages symmetric

1 I-- - ~ ~ - - - - - - - - 1 - - - - - - - , - - - - - - - - r - - - - - J - ~ .. --- ..,-------- - ---- -T ----- -

1 I 9 I 119 11l0 - 6k 1"2.5 4 2.68 I 2.8 4I 4.01 3.92 3.91

@double V and W type compressore"-)[ 1 /] ] [ I 'IT1-

Cylinder and 1""' ""-. , / / ' I II - ~ -' ~ ~ ~ ~ , . . . . . . . . . . . . . .............stage ar rangemen , :

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TABLE 2k-values(kg.m 2/kW .m in3) Diesel driven compressors. 4-stroke Diesel engine and compressorworking a t the same crankshaft.Suctlon pressure l bar(0.9bar in cylinder). I ... s t stage,II.. 2nd stage, D . . Diesel cylinder. D(90) . . means f . i . : in jektion 90after drawn pos.a paralle l cylinders, 2 stagesCylinder and stagarrangement

ressure bar(abs)

b V-type engine, lcyl.D iesel, lcyl.compr.

Cylinder and stagarrangement

c double V-type enginesCylinder and stagearrangement

r-- --- ---- - - - - - - - 1-- --- -- --- -- - -----------------!------

D

1>

9 9bar(abs) __l0- 6k !

'

5- ~ - - t ~ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -.51 6.55 6.52d double V-type engines

Cylinder and stagearrangement

pressure bar(abs)

l:((;o jI ""'_['-, JJj1d? _>""- ""-/ ' x ~

7. ------------

7.50

][" ]) {qp") . !I"-. -...... / . I~ J. - - - - - - - - ,,9 9 I- - - - - - - - - - - - - - --

8.10 l7.37 i

206

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w(t)

-1 r-evo{u{ion I~ - - - - - - - - - - - - .. ----- - - - ~

JT.t). - - -W i t t .: : ~ o

time i

- - " - - - ~ - -

Il __/

II 'I b \~ - - - - - - ~

rI--1

I IIII

I

~ i:'"'&;-tI~ ~~

Ii

207

Figure 1De1ffti:i: tion o'f th'i' coe f f i cien of cycii cvariation. W:angular speed,

Figure 2Flywheel dimensions, notation .