References
345
c. Repeat the steps (a) to (e) of the previous exercise. Observe that the efficiency
increases by opening the stator vanes to α 1 45
=
°
, but that it decreases with
respect to this value by further opening to α 1 30
=
°
. This shows that there is an
optimum stator vane angle.
A:
A:
References
1. Dietzel F (1980) Turbinen, Pumpen und Verdichter. Vogel Verlag, ISBN 3-8023-0130-7
2. Dixon SL, Hall CA (2014) Fluid mechanics and thermodynamics of turbomachinery, 7th edn.
Elsevier, ISBN 978-0-12-415954-9
3. Vivier L (1966) Turbines hydrauliques et leur régulation. Albin Michel, Paris, no ISBN. Rather
old book, but still relevant for theory, application and design of hydraulic turbines
v
m s v
m s u
m s W
J kg
a
u
i
1
1
3 575
3 575
7 405
26 430
0 77
=
=
=
=
=
.
/ ,
.
/ ,
.
/ ,
.
/ ,
.
∆
η
0 0
0758
0 892
,
.
,
. .
R =
=
λ
v
m s v
m s u
m s W
J kg
a
u
i
1
1
3 575
2 064
11 322
23 369
0 6
=
=
=
=
=
.
/ ,
.
/ ,
.
/ ,
.
/ ,
.
∆
η
8 81
0 909
1 366
,
.
,
.
.
R =
=
λ