Aerodynamic limits air injection for heavy-duty gas turbine: compressor aerodynamic limits for power augmentation and ramp-up capabilities

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dc.contributor.authorSzymanski, Artur
dc.contributor.authorIgie, Uyioghosa
dc.contributor.authorHamilton, Richard
dc.date.accessioned2022-05-12T17:27:45Z
dc.date.available2022-05-12T17:27:45Z
dc.date.issued2022-04-24
dc.description.abstractImproved operational flexibility of gas turbines can play a major role in stabilising the electric power grid, by backing up intermittent renewable power. Gas turbines offer on-demand power and fast dispatch of power that is vital when renewable power reduces. This has brought about increasing demand to improve the ramp-up rate of gas turbines. One approach is through the injection of compressed air from energy storage or an auxiliary compressor. This method is the focus of the present work, which shows for the first time, the implications and limits of compressor air injection in a high-fidelity Computational Fluid Dynamics model (CFD). The 3D multi-stage model of the compressor was developed in ANSYS CFX v19.2, while the boundary conditions related to the injection cases have been obtained from a corresponding 0D engine model. The upper limits to air injection determine how much air can be injected into the engine, providing indicative values of power augmentation and ramp-up rate capabilities. These have been previously addressed by the authors using 0D models that do not consider the compressor aerodynamics in great detail. The CFD study has shown that for power augmentation, 16% of compressed air (based on compressor exit) is allowed based on the onset of stall. It also shows that increasing air injection amplifies losses, blockage factor and absolute velocity angle. Also, about 30% of the blade span from the hub is dominated by a rise in the total pressure loss coefficient, except the outlet guide vane for which separation occurs at the tip. For the ramp-up rate analysis, up to 10% air injection is shown to be sustainable. The work shows that the improvements in the 0D analytical engine model are plausible, in addition to demonstrating similar limits at different ambient temperatures.en_UK
dc.identifier.citationSzymanski A, Igie U, Hamilton R. (2022) Aerodynamic limits air injection for heavy-duty gas turbine: Compressor aerodynamic limits for power augmentation and ramp-up capabilities. Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy, Volume 236, Issue 7, November 2022, pp. 1257–1270en_UK
dc.identifier.issn0957-6509
dc.identifier.urihttps://doi.org/10.1177/09576509221092510
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/17892
dc.language.isoenen_UK
dc.publisherSAGEen_UK
dc.rightsAttribution-NonCommercial 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc/4.0/*
dc.subjectCompressor aerodynamicsen_UK
dc.subjectcompressor performanceen_UK
dc.subjectengine modelling/simulationen_UK
dc.subjectengine performanceen_UK
dc.subjectgas and power generationen_UK
dc.subjectgas turbine aerodynamicsen_UK
dc.subjectgas turbine performanceen_UK
dc.subjectpower generationen_UK
dc.titleAerodynamic limits air injection for heavy-duty gas turbine: compressor aerodynamic limits for power augmentation and ramp-up capabilitiesen_UK
dc.typeArticleen_UK

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