Determining the Pressure Gain of Pressure Gain Combustion

Kaemming, Thomas A.; Paxson, Daniel E.

doi:10.2514/6.2018-4567

Cited by 63 publications

(28 citation statements)

References 15 publications

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“…All of them are suitable for steady-state 0D gas turbine performance simulation. Therein, it is already assumed that the total kinetic energy at combustor exit during exhaust phase is not thoroughly available for work transfer in the turbine (Kaemming & Paxson, 2018). However, the models' performances deviate from each other.…”

Section: Introductionmentioning

confidence: 99%

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

Neumann¹,

Woelki²,

Peitsch³

2019

Proceedings of Global Power &Amp; Propulsion Society

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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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Section: Introductionmentioning

confidence: 99%

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

Neumann¹,

Woelki²,

Peitsch³

2019

Proceedings of Global Power &Amp; Propulsion Society

View full text Add to dashboard Cite

show abstract

“…However, these data must be condensed to a single representative value for steady-state simulation. Several authors provided guidelines as to which averaging technique is correct for the application [7,14]. The disadvantage of this approach lies in the obtained information, which is ultimately summarized in a representative scalar value.…”

Section: Introductionmentioning

confidence: 99%

“…All have already been used in steady-state zero-dimensional gas turbine performance simulations. Therein, it was already assumed that only a part of the total kinetic energy during the exhaust phase is available for work transfer in the turbine [14]. Nevertheless, the models' performances deviate from each other [19].…”

Section: Introductionmentioning

confidence: 99%

Potentials for Pressure Gain Combustion in Advanced Gas Turbine Cycles

Neumann

Peitsch

2019

Applied Sciences

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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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“…1 At the same time, theoretical and experimental studies of detonative combustion concepts came to the conclusion that pressure gain up to 30% might be possible for pulsed detonation combustion 2,3 and rotating detonation combustion. [4][5][6] This great potential has motivated numerous thermodynamic cycle performance studies. Initially, most focused on the generation of thrust from pulse detonation combustors.…”

Section: Introductionmentioning

confidence: 99%

“…Experimental studies on resonant pulsed combustors have demonstrated a pressure gain of approximately 3% 1 . At the same time, theoretical and experimental studies of detonative combustion concepts came to the conclusion that pressure gain up to 30% might be possible for pulsed detonation combustion 2,3 and rotating detonation combustion 4‐6 …”

Section: Introductionmentioning

confidence: 99%