7/30/2019 Calculul paletelor de la turbina curtis

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2.5. Calculul exact al treptei de reglare

````Tab.2.2

Nr

crt

Mrimea UM Palete mobile I Palete directoare Palete mobile II

1 Unghi de

intrare aburgrd 529.171 665.252 721.48

'

1

2Unghi

intrare

paletgrd 529.205311 g 665.285322 g 996.4253

'

1

'

1 g

3 Unghi

ieire paletgrd 529.1722 g 665.23

'

1

'

1 g 193.37'

2

'

2 g

4Limeareelei de

palete

mm 201 pb 20db 202 pb

5Raza

intradosmm gg

p

p

bR

21

1

1coscos

7.936

'

12coscos gg

dd

bR

8.36

'

2

'

1

2

2coscos gg

p

p

bR

10.8

6

Pasul

retelei

mm

17.13

sinsin21

1

1

p

p

Rt

10

sinsin'

12

dd

Rt

96.7

sinsin'

2

'

1

2

2

p

p

Rt

7 Nr. De

palete- 1

1

p

ptdn

126

d

dtdn

40

2

2

p

ptdn

209

8 Pasul

recalculatmm

1

1

p

rpn

dt

=13.21

d

drn

dt

=9.92

2

2

p

rpn

dt

=7.97

9

Grosimea

paletei la

bordul de

atac

mm 11ps =1 d1s =1 21ps =1

10

Grosimea

paletei la

bordul de

fuga

mm 12 ps =0.5 ds2 =0.5 22 ps =0.5

11 Factorul de

ngustare-

grp

p

pt

s

21

12

1sin

1

'1

2

sin1

gdr

dd

t

s

'

22

22

2sin

1

grp

p

pt

s

7/30/2019 Calculul paletelor de la turbina curtis

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0.874 0.874 0.896

12 Pierderi n

paleteKj/Kg 2000

2

2

2

1

1

wwzp

58.456

2000

2'

1

2

2cc

zd

13.29

2000

2'

2

2'

1

2

wwzp

2.32

13

Entalpia

aburului la

ieirea dinpalete

Kj/Kg

111 pp zii

3260.066

dpd zii 1

3273.356

22 pdpzii

3275.676

14

Volumul

specific la

ieirea dinpal

ete

m3/Kg 1pv =0.141 dv =0.143 2pv =0.1435

15nlimeapaletei la

ieiremm 2121

111

12sin

sin

vw

vcll

p

pa

ap

12.39

'

11

'

1

221

122sin

sin

pd

dp

pdvc

vwll

16.32

'

2

'

22

'

12

'

1

222sin

sin

dp

pd

dpvw

vcll

23.22

16nlimeapaletei la

intrare

mm

)( 2111 ap ll

11

)( 21121 pd ll

14.39

)( 21221 dp ll

19.32

17Unghi de

evazare al

paletei

grd

1

1112

12 p

pp

pb

llarctg

2.65

d

ddd

b

llarctg

2

12

3.68

2

2122

22 p

pp

pb

llarctg

6.95