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GPPS Beijing19

16th - 18th September 2019

[198] A Comparison of Steady-State Models for Pressure Gain Combustion in Gas Turbine Performance Simulation

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→ Nicolai Neumann
→ Dominik Woelki
→ Dieter Peitsch

Institute of Aeronautics and Astronautics Technische Universität Berlin, Germany

Published: Beijing, 16th-18th September 2019


DOI 10.33737/gpps19-bj-198

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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