Convergence Criteria for Axial Compressor Flow Calculations
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Authors
Vekinis, Andrew
Longley, John
Conference Name
Global Power and Propulsion Society
Language
English
Type
Conference Object
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VoR
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Vekinis, A., & Longley, J. Convergence Criteria for Axial Compressor Flow Calculations. Global Power and Propulsion Society. https://doi.org/10.17863/CAM.32547
Abstract
Computational fluid dynamics is routinely used in the
turbomachinery industry to aid in the design of axial flow
compressors. The predictive capability of such codes is
related to the quality of the numerical convergence of the
flow solutions they produce. In certain cases convergence
cannot be attained and various publications have linked this
to the boundary conditions used within the code. In this
paper an investigation in to how common types of boundary
conditions affect the numerical convergence is described.
The point at which steady-state calculations fail to predict the
increasing non-axisymmetric flowfield at off-design, part
speed operation is identified.
The analysis of the convergence process is combined
with numerical experiments to show that the rate of
convergence of steady-state mixing-plane multi-stage axial
compressor calculations depends upon the operating point on
the pressure-rise versus mass flow rate characteristic.
Intrinsically, as the calculated overall characteristic reaches
its peak the rate of convergence decreases to zero. Ways to
enhance the rate of convergence, for example the technique
of adding a downstream nozzle, and conditions under which
such techniques are likely to be successful are discussed.
Sponsorship
Siemens Turbomachinery, Lincoln
Identifiers
External DOI: https://doi.org/10.17863/CAM.32547
This record's URL: https://www.repository.cam.ac.uk/handle/1810/285177
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