Abstract
The effect of two heat additions, rather than one, in a gas turbine engine is analyzed from the second law of thermodynamics point of view. A regenerative Brayton cycle model is used for this study, and compared with other models of Brayton cycle. All fluid friction losses in the compressor and turbine are quantified by an isentropic efficiency term. The effect of pressure ratio, turbine inlet temperature, ambient temperature, altitude, and altitude with variable ambient temperature on irreversibility "exergy destroyed" and second law efficiency was investigated and compared for all models. The results are given graphically with the appropriate discussion and conclusion.
Highlights
Brayton cycle has been utilized extensively in applications
Tyagi et al [3], carried out an ecological function optimization of an irreversible regenerative Brayton cycle with isothermal heat addition along with real processes using the concept of finite time thermodynamics
For increasing the performance and decreasing the NOx emission, a hypothetical modification of the Brayton cycle is considered in this study. This modification includes a converging combustion chamber in which an isothermal heat addition process is approximated at a peak temperature ~ 1100 K less than the peak temperature ~ 1300 K in the conventional Brayton cycle
Summary
The effect of two heat additions, rather than one, in a gas turbine engine is analyzed from the second law of thermodynamics point of view. A regenerative Brayton cycle model is used for this study, and compared with other models of Brayton cycle. All fluid friction losses in the compressor and turbine are quantified by an isentropic efficiency term. The effect of pressure ratio, turbine inlet temperature, ambient temperature, altitude, and altitude with variable ambient temperature on irreversibility “exergy destroyed” and second law efficiency was investigated and compared for all models. The results are given graphically with the appropriate discussion and conclusion. Keywords Modified Brayton cycle, Exergy analysis, Isothermal heat addition, second law efficiency
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