Sub-idle is a very challenging operating region as the performance of a gas turbine engine changes significantly compared with design conditions. In addition, the regulations for new and existing engines are becoming stricter and the prediction of engine relight capability is essential. In order to predict the performance of an engine, detailed component maps are required. The data obtained from rig tests are insufficient at low speeds, creating the need for generation of maps within the sub-idle regime. The first step toward this direction is the use of an extrapolation process. This is a purely mathematical process and the results are not usually of sufficient accuracy. In addition, this method does not provide any insight on the physical phenomena governing the operation of the compressor at low speeds. The accuracy of the resulting compressor map can be increased with a better low speed region definition; this can be achieved via the thorough study of a locked rotor compressor, enabling the derivation of the zero rotational speed line and allowing an interpolation process for the generation of the low speed part of the characteristic. In this work, an enhanced sub-idle compressor map generation technique is proposed. The suggested methodology enables the generation of characteristics at far off-design conditions with enhanced physical background. Alternative parameters for map representation are also introduced. Provided that the all the blade rows of the compressor are of known geometry, a numerical analysis is used for the calculation of the characteristic of the half stage and a stage stacking method is employed to create the entire compressor characteristic. This way, the sub-idle region of the map can be calculated through interpolation, which provides a more accurate and predictive technique. Application of the method for compressor map generation showed that the proposed interpolation approach is robust and capable of enhancing any performance simulation tool used for the prediction of transient altitude relight or ground-starting maneuvers.
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e-mail: p.zachos@cranfield.ac.uk
e-mail: i.aslanidou@cranfield.ac.uk
e-mail: v.pachidis@cranfield.ac.uk
e-mail: r.singh@cranfield.ac.uk
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August 2011
Research Papers
A Sub-idle Compressor Characteristic Generation Method With Enhanced Physical Background
Pavlos K. Zachos,
Pavlos K. Zachos
Department of Power and Propulsion, School of Engineering,
e-mail: p.zachos@cranfield.ac.uk
Cranfield University
, Cranfield, Bedfordshire MK43 0AL, UK
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Ioanna Aslanidou,
Ioanna Aslanidou
Department of Power and Propulsion, School of Engineering,
e-mail: i.aslanidou@cranfield.ac.uk
Cranfield University
, Cranfield, Bedfordshire MK43 0AL, UK
Search for other works by this author on:
Vassilios Pachidis,
Vassilios Pachidis
Department of Power and Propulsion, School of Engineering,
e-mail: v.pachidis@cranfield.ac.uk
Cranfield University
, Cranfield, Bedfordshire MK43 0AL, UK
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Riti Singh
Riti Singh
Department of Power and Propulsion, School of Engineering,
e-mail: r.singh@cranfield.ac.uk
Cranfield University
, Cranfield, Bedfordshire MK43 0AL, UK
Search for other works by this author on:
Pavlos K. Zachos
Department of Power and Propulsion, School of Engineering,
Cranfield University
, Cranfield, Bedfordshire MK43 0AL, UKe-mail: p.zachos@cranfield.ac.uk
Ioanna Aslanidou
Department of Power and Propulsion, School of Engineering,
Cranfield University
, Cranfield, Bedfordshire MK43 0AL, UKe-mail: i.aslanidou@cranfield.ac.uk
Vassilios Pachidis
Department of Power and Propulsion, School of Engineering,
Cranfield University
, Cranfield, Bedfordshire MK43 0AL, UKe-mail: v.pachidis@cranfield.ac.uk
Riti Singh
Department of Power and Propulsion, School of Engineering,
Cranfield University
, Cranfield, Bedfordshire MK43 0AL, UKe-mail: r.singh@cranfield.ac.uk
J. Eng. Gas Turbines Power. Aug 2011, 133(8): 081702 (8 pages)
Published Online: April 7, 2011
Article history
Received:
May 27, 2010
Revised:
July 6, 2010
Online:
April 7, 2011
Published:
April 7, 2011
Citation
Zachos, P. K., Aslanidou, I., Pachidis, V., and Singh, R. (April 7, 2011). "A Sub-idle Compressor Characteristic Generation Method With Enhanced Physical Background." ASME. J. Eng. Gas Turbines Power. August 2011; 133(8): 081702. https://doi.org/10.1115/1.4002820
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