Zonal large-eddy simulation of a tip leakage flow. Issue 6 (October 2016)

• Record Type: Journal Article
• Authors: Boudet, Jérôme; Caro, Joëlle; Li, Bo; Jondeau, Emmanuel; Jacob, Marc C
• Is Part Of: International journal of aeroacoustics. Volume 15:Issue 6/7(2016)
• Page Start: 646
• Page End: 661
• Publication Date: 2016-10
• Subjects: Fan -- Tip Clearance -- Zonal Large-Eddy Simulation; Aerodynamic noise -- Periodicals; Acoustical engineering -- Periodicals; Sound -- Periodicals; 629.1323
• DOI: 10.1177/1475472X16659215
• Languages: English
• ISSNs: 2048-4003

Abstract

The flow induced by the clearance between the tip of an isolated airfoil and an end-plate is investigated numerically, using a zonal approach with large-eddy simulation in the region of interest. The results are analyzed in comparison with available experimental data, presented in a companion paper. The incoming boundary layer and the pressure distribution around the blade are evaluated. The description of the inflow-jet deviation, with an averaged approach, enables to represent the proper loading on the airfoil. Also, particular attention is paid to the powerful tip-leakage vortex. The vortex characteristics are investigated using specific functions to locate its center and quantify its width. Overall, good results are obtained for the flow statistics and spectra. Furthermore, a very good description of the far-field pressure is achieved using the acoustic analogy, and the results confirm that the tip-flow essentially radiates in the central frequency range (0.7 kHz, 7 kHz).