A method for modelling compressor bleed in gas turbine analysis software

Hackney, R.; Nikolaidis, Theoklis; Pellegrini, Alvise

doi:10.1016/j.applthermaleng.2020.115087

Cited by 13 publications

(2 citation statements)

References 6 publications

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“…Other analyses on interstage flow extractions in the study were shown to cause the stage to move towards choke, but subsequent stages towards stall. This behaviour is also highlighted for a two-shaft engine with power turbine, in the work of Hackney et al [14]. Similarly, Yang et al [15] demonstrate the impact of air extraction (up to 30%) at the end of the compressor, keeping the exhaust gas temperature constant.…”

Section: Introductionmentioning

confidence: 77%

Gas turbine minimum environmental load extension with compressed air extraction for storage

Abudu

Igie

Minervino

et al. 2020

Applied Thermal Engineering

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The fact that most renewable forms of energy are not available on-demand and are typically characterised by intermittent generation currently makes gas turbine engines an important source of back-up power. This study focuses on one of the capabilities that ensure that gas turbines are more flexible on the electric power grid. The capability here is the minimum environmental load that makes it possible to keep a gas turbine engine on the grid without a shut-down, to offer grid stability, adding inertia to the grid in periods when there is no demand for peak power from the engine. It is then desirable to operate the engine at the lowest possible load, without infringing on carbon monoxide emissions that becomes dominant. This paper demonstrates this potential through the extraction of the pressurised air from the back end of the compressor into an assumed energy storage system. The simulation of the engine performance using an in-house tool shows the additional reduction of the power output when the maximum closing of variable inlet guide vane is complemented with air extractions. However, the identified key strategy for achieving a lower environmental load (with same carbon monoxide emission limit) is to always maintain the design flame temperature. This is contrary to the conventional approach that involves a decrease in such temperatures. Here, a 34% reduction in load was achieved with 24% of flow extraction. This is shown to vary with ambient temperatures, in favour of lower temperatures when the combustor inlet pressures are higher. The emission models applied were based on empirical correlations and shows that higher combustor inlet pressures, high but constant flame temperatures with core flow reduction is crucial to obtaining a low environmentally compliant load. The compressor analysis shows that choking is a noticeable effect at a higher rate of extractions; this is found to occur at the stages closest to the extraction location.

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Section: Introductionmentioning

confidence: 77%

Gas turbine minimum environmental load extension with compressed air extraction for storage

Abudu

Igie

Minervino

et al. 2020

Applied Thermal Engineering

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“…Although the SAS is of considerable importance in maximizing engine durability, bleed air has an adverse impact on the overall performance of the engine. 1,2 It is essential to minimize the coolant flow with the help of a generic and credible simulation platform.…”

Section: Introductionmentioning

confidence: 99%

Turbofan engine performance prediction methodology integrated high-fidelity secondary air system models

Yang

Jian

Dong

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part G:

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This research studies the performance of an ultra-high bypass ratio turbofan engine, and specifically its secondary air system (SAS). A co-simulation methodology is explored whereby a high-fidelity SAS model and an engine performance code featuring flexible modules can be coupled and interactively executed. The percentage of bleed flows and boundary conditions for the SAS are updated at each iteration step. For this purpose, a SAS model including different elements is developed. Furthermore, a commercial computational fluid dynamics (CFD) solver is adopted to capture the complex flow field in the pre-swirl system. The credibility of cycle calculation and SAS elements is validated by comparing with publicly available data. Subsequently, an elaborately designed SAS is modeled and co-simulated with the AGTF30 engine using a flow network simulation method. The coupling effect between the engine performance and the SAS is studied for eight different flight conditions. The correlation and prediction of engine performance due to seal clearance change is presented. The co-simulation approach clarifies the mutual interactions between the engine overall parameters and the SAS. The results reveal that the enhanced flow network model can improve the simulation accuracy of engine performance over a wide range of operating conditions.

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Exploitation of multi-models identification with decoupled states in twin shaft gas turbine variables for its diagnosis based on parity space approach

Aissat

Hafaifa

Iratni

et al. 2021

Int. J. Dynam. Control

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A method for modelling compressor bleed in gas turbine analysis software

Cited by 13 publications

References 6 publications

Gas turbine minimum environmental load extension with compressed air extraction for storage

Gas turbine minimum environmental load extension with compressed air extraction for storage

Turbofan engine performance prediction methodology integrated high-fidelity secondary air system models

Exploitation of multi-models identification with decoupled states in twin shaft gas turbine variables for its diagnosis based on parity space approach

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