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Publications at Chair of Aero Engines

Potentials for Pressure Gain Combustion in Advanced Gas Turbine Cycles
Citation key 2019_neumann_n_japplsci
Author Neumann, N. and Peitsch, D.
Pages 3211
Year 2019
ISSN 2076-3417
DOI 10.3390/app9163211
Location Basel, Switzerland
Journal Journal of Applied Sciences
Volume 9
Number 16
Month 08
Note Technische Universität Berlin:
N. Neumann, D. Peitsch
Publisher MDPI
How Published Creative Commons Attribution 4.0 International License CC-BY 4.0
Abstract Pressure gain combustion evokes great interest as it promises to increase significantly gas turbine efficiency and reduce emissions. This also applies to advanced thermodynamic cycles with heat exchangers for intercooling and recuperation. These cycles are superior to the classic Brayton cycle and deliver higher specific work and/or thermal efficiency. The combination of this revolutionary type of combustion in an intercooled or recuperated gas turbine cycle can, however, lead to even higher efficiency or specific work. The research of these potentials is the topic of the presented paper. For that purpose, different gas turbine setups for intercooling, recuperation, and combined intercooling and recuperation are modeled in a gas turbine performance code. A secondary air system for turbine cooling is incorporated, as well as a blade temperature evaluation. The pressure gain combustion is represented by analytical-algebraic and empirical models from the literature. Key gas turbine specifications are then subject to a comprehensive optimization study, in order to identify the design with the highest thermal efficiency. The results indicate that the combination of intercooling and pressure gain combustion creates synergies. The thermal efficiency is increased by 10 percentage points compared to a conventional gas turbine with isobaric combustion.
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