written 6.4 years ago by | • modified 5.4 years ago |
velocity and velocity of flow is constant. Assume number of frictional classes. find speed of wheel and vane angle at exit
written 6.4 years ago by | • modified 5.4 years ago |
velocity and velocity of flow is constant. Assume number of frictional classes. find speed of wheel and vane angle at exit
written 6.4 years ago by |
Given:-
H=30m
D1=1.2 m
D2=0.6 m
Guide blade angle α=15∘
inlet vane angle Θ=90∘
i.e Vr1=vf1andVw1=0
vw2=0
vf1=vf2=vf
speed of whee, Nand vane angle ϕ at exit
u1vw2=v1cosα=v1cos/5
vf1=v1sinα=vf2=v2
vf1=vf2=v2=v1sin/5
H=Vw1.u1g+V222g
30=V1cos15×V1cos159.81+(v1sin15)22×9.81
Θ=tan−1Vf1BD=tan−1(2.150.093)=87.52∘.....
Θ=tan−1vf2u2=tan−1(2.156.05)=19.564∘...ans
v2=vf2=2.15m/s
ii) Head at inlet of turbine H:
H=$\frac{vw_{1}}{9}+\frac{v^{2}_{2}}{29}=\frac{12.193\times …