408
11 Power Gas Turbines
with 129 kg/s exhaust mass flow and TOT = 436 °C (the specific power is 332.6 kJ/
kg). The TIT is about 1250 °C. So, one can verify that the order of magnitude of the
specific power is in accordance with the results in Fig. 11.15. One can also verify
the TOT in Fig. 11.16. Again, precise verification is not possible, because the results
for TOT strongly depend on the value of TIT and the value of the heat transfer coefficient κ. So, it is quite easy to reproduce the real values of specific power and TOT
by adjusting TIT and κ. The fuel-air ratio (Fig. 11.17) is in the order of what we
verified earlier. The ratio of the cooling flow rate to the air flow rate aspired by the
compressor (Fig. 11.18) is on the order of 4–6 %, but the simulations are done with
very advanced values of heat transfer coefficient κ and effectiveness ε. Doubling
the value of κ means, in principle, doubling the value of the cooling air flow rate.
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Fig. 11.16 Turbine outlet temperature with the simple cycle (CH 4 )
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Fig. 11.15 Specific power of a simple-cycle gas turbine (CH 4 )