Compressor intercooling has traditionally been employed to reduce compressor work and augment gas turbine output power. Conventional intercooling schemes are usually applied through nonmixed heat exchangers between two compressor stages or by cooling the outside of the compressor casing. Any cooling schemes that may affect the flow field inside the compressors have not been favorably considered due to concerns of any disturbance that might adversely affect the compressor’s performance stability. As the inlet fog cooling scheme has become popular as an economic and effective means to augment gas turbine output power on hot or dry days, consideration has been given to applying fog cooling inside the compressors by injecting fine water droplets between stages (i.e., interstage fogging). This paper focuses on developing a stage-by-stage wet compression theory for overspray and interstage fogging that includes the analysis and effect of preheating and precooling at each small stage of the overall compressor performance. An algorithm has been developed to calculate the local velocity diagram and allow a stage-by-stage analysis of the fogging effect on airfoil aerodynamics and loading with known 2D meanline rotor and stator geometries. Thermal equilibrium model for water droplet evaporation is adopted. The developed theory and algorithm are integrated into the systemwise FogGT program to calculate the overall gas turbine system performance.

1.
Meher-Homji
,
C. B.
, and
Mee
,
T. R.
, 1999, “
Gas Turbine Power Augmentation by Fogging of Inlet Air
,”
Proceedings of the 28th Turbomachinery Symposium
, Houston, TX, Sept.
2.
Bagnoli
,
M.
,
Bianchi
,
M.
,
Melino
,
F.
,
Peretto
,
A.
,
Spina
,
P. R.
,
Bhargava
,
R.
, and
Ingistov
,
S.
, 2004, “
A Parametric Study of Interstage Injection on GE Frame 7EA Gas Turbine
,”
ASME
Paper No. GT-2004-53042.
3.
Ingistov
,
S.
, 2001, “
Interstage Injection System for Heavy Duty Industrial Gas Turbine Model 7EA
,”
ASME
Paper No. 2001-GT-407.
4.
Shepherd
,
D. W.
, and
Fraser
,
D.
, 2006, “
Impact of Heat Rate, Emissions and Reliability from the Application of Wet Compression on Combustion Turbines
,”
Power-Gen International
, Las Vegas, NV, Nov. 28–30.
5.
Hill
,
P. G.
, 1963, “
Aerodynamic and Thermodynamic Effects of Coolant Injection on Axial Compressors
,” Aeronautical Quarterly, Feb., pp.
333
348
.
6.
Zheng
,
Q.
,
Sun
,
Y.
,
Li
,
S.
, and
Wang
,
Y.
, 2002, “
Thermodynamic Analysis of Wet Compression Process in the Compressor of Gas Turbine
,”
ASME
Paper No. GT-2002-30590.
7.
Zheng
,
Q.
,
Li
,
M.
, and
Sun
,
Y.
, 2003, “
Thermodynamic Analysis of Wet Compression and Regenerative (WCR) Gas Turbine
,”
ASME
Paper No. GT-2003-38517.
8.
Ransom
,
D.
,
Brun
,
K.
, and
Kurz
,
R.
, 2007, “
Enthalpy Determination Methods for Compressor Performance Calculations
,”
ASME
Paper No. GT-2007-27038.
9.
Li
,
M.
, and
Zheng
,
Q.
, 2004, “
Wet Compression System Stability Analysis
,”
ASME
Paper No. GT-2004-54018.
10.
Roumeliotis
,
I.
, and
Mathioudakis
,
K.
, 2006, “
Evaluation of Interstage Water Injection Effect on Compressor and Engine Performance
,”
ASME J. Eng. Gas Turbines Power
0742-4795,
128
(
4
), pp.
849
856
.
11.
Lecheler
,
S.
, and
Hoffman
,
J.
, 2003, “
The Power of Water in Gas Turbines: ALSTOM’s Experience With Air Inlet Cooling
,”
Proceedings of PowerGen 2003
, São Paolo, Brazil, Nov. 11–13.
12.
Payne
,
R. C.
, and
White
,
A. J.
, 2007, “
Three-Dimensional Calculations of Evaporative Flow in Compressor Blade Rows
,”
ASME
Paper No. GT-2007-27331.
13.
Bagnoli
,
M.
,
Bianchi
,
M.
,
Melino
,
F.
, and
Spina
,
P. R.
, 2006, “
Development and Validation of a Computational Code for Wet Compression Simulation of Gas Turbines
,”
ASME
Paper No. GT-2006-90342.
14.
Bagnoli
,
M.
,
Bianchi
,
M.
,
Melino
,
F.
,
Peretto
,
A.
,
Spina
,
P. R.
,
Ingistov
,
S.
, and
Bhargava
,
R. K.
, 2006, “
Application of a Computational Code to Simulate Interstage Injection Effects on GE Frame 7EA Gas Turbine
,”
ASME
Paper No. GT-2006-90343.
15.
White
,
A. J.
, and
Meacock
,
A. J.
, 2004, “
An Evaluation of the Effects of Water Injection on Compressor Performance
,”
ASME J. Eng. Gas Turbines Power
0742-4795,
126
, pp.
748
754
.
16.
Abdelwahab
,
A.
, 2006, “
An Investigation of the Use of Wet Compression In Industrial Centrifugal Compressors
,”
ASME
Paper No. GT-2006-90695.
17.
Zamzam
,
M. M.
, and
Al-Amiri
,
A. M.
, 2007, “
A Novel Free-Cooling Scheme for Combustion Turbine Inlet Air Cooling
,”
ASME
Paper No. GT-2007-27621.
18.
Sanaye
,
S.
,
Rezazadeh
,
H.
, and
Aghazeynali
,
M.
, 2006, “
Effects of Inlet Fogging and Wet Compression on Gas Turbine Performance
,”
ASME
Paper No. GT-2006-90719.
19.
Spina
,
P. R.
, 2002, “
Gas Turbine Performance Prediction by Using Generalized Performance Curves of Compressor and Turbine Stages
,”
ASME
Paper No. GT-2002-30275.
20.
Bianchi
,
M.
,
Melino
,
F.
,
Peretto
,
A.
,
Spina
,
P. R.
, and
Ingistov
,
S.
, 2007, “
Influence of Water Droplet Size and Temperature on Wet Compression
,”
ASME
Paper No. GT-2007-27458.
21.
Sexton
,
M. R.
,
Urbach
,
H. B.
, and
Knauss
,
D. T.
, 1998 “
Evaporative Cooling for NOx Suppression and Enhanced Engine Performance for Naval Gas Turbine Propulsion Plants
,”
ASME
Paper No. 98-GT-332.
22.
Kim
,
K. H.
, and
Perez-Blanco
,
H.
, 2006, “
An Assessment of High-Fogging Potential for Enhanced Compressor Performance
,”
ASME
Paper No. GT-2006-90482.
23.
Khan
,
J. R.
, and
Wang
,
T.
, 2006, “
Fog and Overspray Cooling for Gas Turbine Systems With Low Calorific Value Fuels
,”
ASME
Paper No. GT-2006-90396.
24.
Saravanamuttoo
,
H. I. H.
,
Cohen
,
H.
, and
Rogers
,
G.
, 1996,
Gas Turbine Theory
,
4th ed.
,
Longman
,
Essex, England
.
25.
Wilson
,
D. G.
, and
Korakianitis
,
T.
, 1988,
The Design of High-Efficiency Turbomachinery and Gas Turbines
,
2nd ed.
,
Prentice-Hall
,
Englewood Cliffs, NJ
, pp.
79
87
.
26.
Klepper
,
J.
,
Hale
,
A.
,
Davis
,
M.
, and
Hurwitz
,
W.
, 2004, “
A Numerical Investigation of the Effects of Steam Ingestion on Compression System Performance
,”
ASME
Paper No. GT2004-54190.
27.
Young
,
J. B.
, 1995, “
The Fundamental Equations of Gas-Droplet Multiphase Flow
,”
Int. J. Multiphase Flow
0301-9322,
21
(
2
), pp.
175
191
.
28.
Wang
,
T.
, and
Khan
,
J. R.
, 2010, “
Overspray and Interstage Fog Cooling in Gas Turbine Compressor Using Stage-Stacking Scheme—Part II: Case Study
,”
J. Thermal Sci. Eng. Appl.
1948-5085,
2
, p.
031002
.
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