On the receptivity of low-pressure turbine blades to external disturbances
نویسندگان
چکیده
In the present work, laminar–turbulent transition of flow evolving around a low-pressure turbine blade has been investigated. Direct numerical simulations have carried out for two different free stream turbulence intensity (FSTI) levels to investigate role oscillations on evolution boundary layer. Emphasis is placed identifying mechanisms driving formation and breakup coherent structures in high FSTI case how these processes are affected by leading-edge receptivity and/or continuous forcing passage. Proper orthogonal decomposition (POD) adopted provide clear statistical representation shape structures. Extended POD projections provided temporal spanwise correlations that allowed us identify dominant wavelengths process. The extended analysis shows pressure side not related what happens at leading edge. results suction show modes defining edge passage bases correlate with responsible transition. most energetic mode basis strongly amplified wavelength layer events Modes smaller belong band predicted optimal disturbance theory, they amplify gain rear side, highest degree correlation between region side.
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ژورنال
عنوان ژورنال: Journal of Fluid Mechanics
سال: 2022
ISSN: ['0022-1120', '1469-7645']
DOI: https://doi.org/10.1017/jfm.2022.127