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Body-force and mean-line models for the generation of axial compressor sub-idle characteristics

Published online by Cambridge University Press:  07 July 2020

M. Righi Open the ORCID record for M. Righi [Opens in a new window] ,
L.E. Ferrer-Vidal  and
V. Pachidis
M. Righi*
Affiliation:
Centre for Propulsion Engineering, Cranfield University, Cranfield, UK
L.E. Ferrer-Vidal
Affiliation:
Centre for Propulsion Engineering, Cranfield University, Cranfield, UK
V. Pachidis
Affiliation:
Centre for Propulsion Engineering, Cranfield University, Cranfield, UK
*
[email protected]
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Abstract

This paper describes the application of low-order models to the prediction of the steady performance of axial compressors at sub-idle conditions. An Euler body-force method employing sub-idle performance correlations is developed and presented alongside a mean-line approach employing the same set of correlations. The low-order tools are used to generate the characteristic lines of the compressor in the locked-rotor and zero-torque windmilling conditions. The results are compared against steady-state operating points from three-dimensional (3D) Reynolds-averaged Navier–Stokes (RANS) computational fluid dynamics (CFD) simulations. The accuracy of the low-order tools in reproducing the results from high-fidelity CFD is analysed, and the trade-off with the computational cost of each method is discussed. The low-order tools presented are shown to offer a fast alternative to traditional CFD which can be used to predict the performance in sub-idle conditions of a new compressor design during early development stages.

Keywords

Axial compressorSub-idle performanceThrough-flow codeMean-line codeCFD
Type
Research Article
Information
The Aeronautical Journal , Volume 124 , Issue 1281 , November 2020 , pp. 1683 - 1701
Copyright
© The Author(s), 2020. Published by Cambridge University Press on behalf of Royal Aeronautical Society

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