Wavelet Analysis of a Blade Tip-Leakage Flow

Abstract : The secondary flow generated by the clearance between an isolated airfoil tip and an end-plate is analyzed by means of a zonal large-eddy simulation, in comparison with available experimental data. The flow around the tip clearance is described with full large-eddy simulation, while Reynolds-averaged Navier-Stokes is employed in the rest of the computational domain in order to limit the computational cost. The various analyses of the flow characteristics (mean velocities, Reynolds stresses, spectra) show a very good agreement between the experiment and the simulation. Furthermore, a detailed analysis is carried out from the numerical results. The flow separations on the blade tip are related with the leakage distribution along the chord, which generates an intense tip-leakage vortex on the suction side. Finally, a hump in the pressure spectra at tip is investigated by means of a wavelet conditional average, and related to the unsteadiness of the aft tip separation
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Submitted on : Tuesday, July 31, 2018 - 5:10:46 PM
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Jérôme Boudet, Marc Jacob, Joëlle Caro, Emmanuel Jondeau, Bo Li. Wavelet Analysis of a Blade Tip-Leakage Flow. AIAA Journal, American Institute of Aeronautics and Astronautics, 2018, pp.0. ⟨10.2514/1.J056703⟩. ⟨hal-01770249v2⟩

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