ftcdraftfinal[1].pdf (7.23 MB)
Large eddy simulation of a controlled diffusion compressor cascade
In this research a Controlled Diffusion (CD) compressor cascade stator blade is simulated at a Reynolds number of similar to 700,000, based on inflow velocity and chord length, using Large Eddy Simulation (LES). A wide range of flow inlet angles are computed, including conditions near the design angle, and at high negative and positive incidence. At all inlet angles the surface pressure distributions are well-predicted by the LES. Near the design angle the computed suction side boundary layer thickness agrees well with experimental data, whilst the pressure side boundary layer is poorly predicted due to the inability of LES to capture natural boundary layer transition on the present grid. A good estimation of the loss is computed near the design angle, whilst at both high positive and negative incidences the loss is less well predicted owing to discrepancies between the computed and experimental boundary layer thickness. At incidences above the design angle a laminar separation bubble forms near the leading edge of the suction surface, which undergoes a transition to turbulence. Similar behaviour is noted on the pressure surface at negative incidence. At high negative incidence contra-rotating vortex pairs are found to form around the leading edge in response to an unsteady stagnation line across the span of the blade. Such structures are not apparent in time-averaged statistical data due to their highly-transient nature.
History
School
- Aeronautical, Automotive, Chemical and Materials Engineering
Department
- Aeronautical and Automotive Engineering
Citation
MCMULLAN, W.A. and PAGE, G.J., 2011. Large eddy simulation of a controlled diffusion compressor cascade. Flow, Turbulence and Combustion , 86 (2), pp. 207 - 230.Publisher
© SpringerVersion
- AM (Accepted Manuscript)
Publication date
2011Notes
This article was published in the journal, Flow, Turbulence and Combustion [© Springer] and the definitive version is available at: http://dx.doi.org/10.1007/s10494-010-9314-zISSN
1386-6184Publisher version
Language
- en