Influence of Ambient Condition on Performance of Wet Compression Process

Gas turbine systems with wet compression have a potential for future power generation, since they can offer a high efficiency and a high specific power with a relatively low cost. In this study influence of ambient condition on the performance of the wet compression process is investigated with a non-equilibrium analytical modeling based on droplet evaporation. Transient behaviors of droplet diameter and temperature of mixed air are investigated for various ambient temperatures. Special attention is paid for the effects of ambient temperature, pressure ratio, and water injection ratios on the important wet compression variables including compressor outlet temperature and compression work. Parametric studies show that downing of the ambient temperature leads to lower compressor outlet temperature and consequently lower consumption of compression work even in wet compression processes.

Authors:

• Kyoung Hoon Kim

Keywords:

• water injection
• droplet evaporation
• wet compression
• gas turbine
• ambient condition

References:

[1] P. Ahmadi and I. Dincer, Thermodynamic and exergoenvironmental
analyses, and multi-objective optimization of a gas turbine power plant,
App. Therm. Eng. 31 (2011) 2529-2540.
[2] S.W. Lee, S.U. Kim and K.H. Kim, Aerodynamic performance of
winglets covering the tip gap inlet in a turbine cascade, Int. J. Heat Fluid
Flow, 33 (2012) in press.
[3] K.H. Kim, C.H. Han and K. Kim, Effects of ammonia concentration on
the thermodynamic performances of ammonia-water based power cycles,
Thermochimica Acta 530 (2012) 7-16.
[4] M. Jonsson and J. Yan, Humidified gas-turbines: a reviewed of proposed
and implemented cycles, Energy 30 (2005) 1013-1078.
[5] R. Bhargava and C.B. Mehr-Homji, Parametric analysis of existing gas
turbines with inlet and evaporative and overspray fogging, ASME J. of
Eng. for Gas Turbines and Power 127 (2005) 145-158.
[6] K.H. Kim, Effects of water and steam injection on thermodynamic
performance of gas-turbine systems, App. Mech. Materials 110-116
(2012) 2109-2116.
[7] K.H. Kim, H.J. Ko, K. Kim and H. Perez-Blanco, Analysis of water
droplet evaporation in a gas turbine inlet fogging process, App. Therm.
Eng. 33-34 (2012) 62-69.
[8] K.H. Kim and H. Perez-Blanco, An assessment of high-fogging potential
for enhanced compressor performance, ASME Paper, GT2006-90482
(2006).
[9] A.J. White and A.J. Meacock, An evaluation of the effects of water
injection on compressor performance, ASME paper GT-2003-38237
(2003).
[10] Q. Zheng, Y. Sun, Y. Li and Y. Wang, Thermodynamic analyses of wet
compression process in the compressor of gas turbine, ASME J.
Turbomach. 125 (2003) 489-496.
[11] K.H. Kim and H. Perez-Blanco, Potential of regenerative gas-turbine
systems with high fogging compression, App. Energy 84 (2007) 16-28.
[12] K.H. Kim, H.J. Ko and H. Perez-Blanco, Exergy analysis of gas-turbine
systems with high fogging compression, Int. J. Exergy 8 (2011) 16-32.
[13] H. Perez-Blanco, K.H. Kim and S. Ream, Evaporatively-cooled
compression using a high-pressure refrigerant, App. Energy 84 (2007)
1028-1043.
[14] A.D. Sa, S.A. Zubaidi, Gas turbine performance at varying ambient
temperature, App. Therm. Eng. 31 (2011) 2735-2739.
[15] K.H. Kim, H.J. Ko and H. Perez-Blanco, Analytical modeling of wet
compression of gas turbine systems, App. Therm. Eng. 31 (2011)
834-840.