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A Comparison of Steady-State Models for Pressure Gain Combustion in Gas Turbine Performance Simulation
Citation key 2019_neumann_n_gpps
Author Neumann, N. and Woelki, D. and Peitsch, D.
Pages GPPS-BJ-2019-0198
Year 2019
DOI 10.33737/gpps19-bj-198
Location Beijing, China
Journal GPPS - Proceedings of Global Power and Propulsion Society Conference
Month 09
Note Technische Universität Berlin:
N. Neumann, D. Woelki, D. Peitsch
Editor GPPS
How Published Creative Commons Attribution 4.0 International License CC-BY 4.0
Abstract Pressure gain combustion (PGC) is widely considered to improve gas turbine thermal efficiency substantially. However, there is no consensus on the modelling in gas turbine performance simulation. Even though it remains the main tool for design studies, the steady-state 0D representation has difficulties in modelling the inherently intermittent behaviour of pressure gain combustion. Selecting the optimal gas turbine design is therefore difficult as common PGC models tend to under- or overestimate performance. In this paper, an algebraic combustor model is inferred from published CFD data and varied to have an optimistic and pessimistic representation. These models among others will be used in an optimisation to identify the best gas turbine design with respect to thermal efficiency. The consideration of the secondary air system and blade metal temperatures ensure a realistic case study. At the end of this paper, sensitivity studies shed light on cycle design at uncertain combustor performance. The selected PGC models achieve an improvement in thermal efficiency between 3.8 – 6.6 percentage points compared to conventional isobaric combustion. However, this is less than half the 13.3 percentage points gain promised by ideal isochoric combustion.
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