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Analytical Investigation of Parameters Affecting the Performance of Cooled Gas Turbine Cycle with Evaporative Cooling of Inlet Air

  • Research Article - Mechanical Engineering
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Abstract

The article investigates the effect of compressor pressure ratio, turbine inlet temperature, ambient relative humidity and ambient temperature on the performance parameters of an air-cooled gas turbine cycle with evaporative cooling of inlet air. Air-film cooling has been adopted as the cooling technique for gas turbine blades. The mass of coolant required for turbine blade cooling is calculated for a selected range of ambient conditions and found to vary with temperature drop achieved in the evaporator. The effect of ambient temperature and ambient relative humidity on plant efficiency and plant-specific work is computed at different TIT and r p,c and it was found that the rate of increase in these performance parameters are more pronounced at higher TIT and r p,c. The results indicate that a maximum temperature drop of 21 °C is achieved in the evaporator. The inlet cooling is found to increase the efficiency by 4.1% and specific work by 9.44 %.

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Abbreviations

a:

Ratio of mass of coolant to mass of gas flow

a, b, c:

Constants

cp :

Specific heat (kJ kg−1K−1)

fh :

Correction factor to account for vapor added in humidifier

F:

Factor

Fsa :

Correction factor to account actual blade surface

gt:

Gas turbine

h:

Specific enthalpy (kJ kg−1)

ΔH r :

Lower heating value (kJ kg−1)

\({\dot{m}}\) :

Mass flow rate (kg s−1)

m :

Mass of water (kg)

Q:

Heat energy transfer (W)

r p :

Cycle pressure ratio

R:

Gas constant (kJ kg−1 K−1)

p:

Total pressure (bar)

S:

Blade perimeter (m)

\({\bar {S}t}\) :

Average Stanton number \({=\frac{\bar {h}_g}{c_{p,g} \cdot \rho_g \cdot C_g }}\)

t:

Pitch of blade (m)

T:

Temperature (K)

TIT:

Turbine inlet temperature (K) = combustor exit temperature

W:

Specific work (kJ kg−1)

ta :

Air temperature (°C)

φ :

Relative humidity (%)

ω :

Specific humidity (kg/kg)

α :

Gas flow discharge angle (°)

\({\varepsilon}\) :

Effectiveness (%)\({=\frac{T_{\rm c.e}-T_{\rm c,i}}{T_{\rm b}-T_{\rm c,i}}}\)

η :

Efficiency (%)

a:

Air, ambient

av:

Average

b:

Blade

c:

Compressor

comb:

Combustor

dr:

Drop

e:

Exit

f:

Fuel

g:

Gas

alt:

Alternator

gt:

Gas turbine

h:

Humidifier

i:

Inlet, stage of compressor

in:

Inlet

inc:

Increase

j:

Coolant bleed points

net:

Difference between two values

p:

Pressure

plant:

Gas turbine plant

pt:

Polytropic

sat:

Saturation

vap:

Water vapor

v:

Volume (m3)

w:

Water

AFC:

Air-film cooling

AHIGT:

Air-humidifier integrated gas turbine

C:

Compressor

CC:

Combustion chamber

GT:

Gas turbine

RH:

Relative humidity (ratio)

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Authors and Affiliations

  1. Department of Mechanical Engineering, Nalanda Institute of Technology, Bhubaneswar, India

    Alok Ku. Mohapatra

  2. Department of Mechanical Engineering, National Institute of Technology, Jamshedpur, India

    Sanjay

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  1. Alok Ku. Mohapatra
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Mohapatra, A.K., Sanjay Analytical Investigation of Parameters Affecting the Performance of Cooled Gas Turbine Cycle with Evaporative Cooling of Inlet Air. Arab J Sci Eng 38, 1587–1597 (2013). https://doi.org/10.1007/s13369-013-0598-x

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