Time-resolved PIV measurements of a tip leakage flow

Abstract

International audienceno abstrac

Zonal large-eddy simulation of a tip leakage flow

“…It progressively deviates from the suction surface and its vorticity diffuses, confirming a trend evidenced in the experiment. 7 High levels of vorticity are also observed in the leakage flow below the airfoil.

Figure 6.Contours of non-dimensional mean axial vorticity on four cross-stream planes near the trailing edge of the airfoil.

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“…Various experimental results are available on this configuration, as reported in the companion paper by Jacob et al. 7 The blade chord–length is c = 0.2 m. In the present numerical study, the following conditions are selected: U 0 = 70 m/s and h = 0.01 m. The chord-based Reynolds number is about 9.3 × 10 5 , and the Mach number is 0.2.

Figure 1.Sketch of the configuration.

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Wavelet Analysis of a Blade Tip-Leakage Flow

“…In both the experiment [6,7] and the simulation [8,9], a broad hump was observed in near-field spectra at the airfoil tip, around 1.3 kHz. Moreover, its frequency range, which extends over more than two octave bands, is located within that of the tip-leakage noise (0.7-7 kHz), which makes it particularly interesting.…”

“…In a previous version of the experiment [10], the angle of attack was 15 deg (0.5 deg), but the experimental results used in the present paper have been obtained during a more recent campaign, in which the angle of attack had to be set to 16.5 deg (0.5 deg) in order to recover the same airfoil loading as the original experiment. The details of the experimental configuration and an analysis of the experimental results are presented by Jacob et al [6,7].…”

“…In the present paper, a rather simple configuration is considered: a single airfoil, between two end plates, with a clearance at the lower end. This simplicity enabled Jacob et al [6,7] to carry out a detailed experimental characterization, on both aerodynamics and acoustics. A zonal large-eddy simulation was also performed on the same configuration and compared very favorably to the experiment, as shown by Boudet et al [8,9] on mean flow, Reynolds stresses, and spectra.…”