A simple procedure for calculating the pressure at the onset and termination of condensation shocks that occur in steam nozzles and steam turbine blade passages is presented. In addition, the location of the termination of the condensation shock with reference to the throat location is also predicted. The procedure is based entirely on thermodynamic and gas dynamic considerations, without using a model for droplet nucleation and growth and the nozzle profile. The only input required is the stagnation condition at the inlet to the nozzle. The procedure requires the solution of a system of algebraic equations which can be accomplished quite easily. Calculations have been carried out for several inlet stagnation conditions and the predictions are compared with the available experimental data. The agreement is seen to be reasonable considering the simplicity of the procedure.

References

1.
Guha
,
A.
,
1994
, “
A Unified Theory of Aerodynamic and Condensation Shock Waves in Vapor-Droplet Flows With or Without a Carrier Gas
,”
Phys. Fluids
,
6
(
5
), p.
1893
.
2.
Bakhtar
,
F.
,
Young
,
J. B.
,
White
,
A. J.
, and
Simpson
,
D. A.
,
2005
, “
Classical Nucleation Theory and Its Application to Condensing Steam Flow Calculations
,”
Proc. Inst. Mech. Eng., Part C
,
219
(
12
), pp.
1315
1333
.
3.
Yang
,
Y.
, and
Shen
,
S.
,
2009
, “
Numerical Simulation on Non-Equilibrium Spontaneous Condensation in Supersonic Steam Flow
,”
Int. Commun. Heat Mass Transfer
,
36
(
9
), pp.
902
907
.
4.
Kearton
,
W. J.
,
2004
,
Steam Turbine Theory and Practice
, 7th ed.,
Pitman
,
London
.
5.
Binnie
,
A. M.
, and
Woods
,
M. W.
,
1938
, “
The Pressure Distribution in a Convergent Divergent Steam Nozzle
,”
Proc. Inst. Mech. Eng.
,
138
(
1
), pp.
229
266
.
6.
Moses
,
C. A.
, and
Stein
,
J. D.
,
1978
, “
On the Growth of Steam Droplets Formed in a Laval Nozzle Using Both Static Pressure and Light Scattering Measurements
,”
ASME J. Fluids Eng.
,
100
(
3
), pp.
311
323
.
7.
Moore
,
M. J.
,
Walters
,
P. T.
,
Crane
,
R. I.
, and
Davidson
,
B. J.
,
1973
, “
Predicting the Fog Drop Size in Wet Steam Turbines
,”
IMechE Conference on Heat and Fluid Flow in Steam and Gas Turbine Plant
, Coventry, UK, Apr. 3–5, pp.
101
109
.
8.
Young, J. B., and Bakhtar, F.,
1976
, “
Comparison Between Theoretical Calculations and Experimental Measurements of Droplet Sizes in Nucleating Steam Flows
,”
Trans. Inst. Fluid-Flow Mach.
,
70–72
, pp.
259
271
.
9.
White
,
A. J.
,
Young
,
J. B.
, and
Walters
,
P. T.
,
1996
, “
Experimental Validation of Condensing Flow Theory for a Stationary Cascade of Steam Turbine Blades
,”
Philos. Trans. R. Soc. London A
,
354
(
1704
), pp.
59
88
.
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