Page 464 - eProceeding for IRSTC2017 and RESPeX2017

M. Dwi Trisna / JOURNAL ONLINE JARINGAN COT POLIPD

Figure-5. Speed triangle on inteke water burst Figure-6. Triangle of rotatiaon speed

f. Relative angle of stage I
tan β 1 = 2 tan α 1. (7)
g. Maximum turbine efficiency
2
ŋ t = Cos α 1 (%) (8)
h. Outside diameter of wheel
60 U .
D 1 = 1 (9)
n . 
i. Comparing factor of blades wheel
1   2D Cos  2 / 1
X =  3 1  ; D 3 = 0,326. D 1 (10)
 D 1 
j. Diameter of inner turbine wheel
D 2 = X. D 1 (mm) (11)
Diameter of inner turbine wheel by another calculation:
,Maka D 2 = D 1 – 2.a (mm)
Jika, a = 0,17 D 1
k. Absotule angle of water flow output
 tan2  
0
 = arc.tan. 1 ;  =  3 ;  = 90 (12)
2 2 4
X 2
l. Relative velocity into lavel-1 blades
U
W 1 = 1 (m/s) (13)
Cos  1
m. Velocity of water out
 .D .n
U 2 = 2 (m/s) (14)
60
n. Relative velocity of water out from blades
W 2 = U 2 tan  (m/s)
2
o. Absolute velocity of water from blades
W
C 2 = 2 (m/s) (15)
Sin  2
when, C 2 = C 3 ; W 2 = W 3 ; U 2 = U 3 ; U 4 = U 1 ; W 4 = W 1
p. Absolute velocity of water out from wheel baldes
C 4 = W 1 Sin  (m/s) (16)
1

463 | V O L 1 0 - I R S T C 2 0 1 7 & R E S P E X 2 0 1 7