Non-oscillating/Oscillating Shear Layer over a Large Deep Cavity at Low-Subsonic Speeds |
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Authors: | Mouhammad El Hassan Laurent Keirsbulck Larbi Labraga |
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Institution: | (1) Laboratoire de mécanique et d’énergetique, Université de Valenciennes, Le mont Houy, Valenciennes, 59300, France |
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Abstract: | The flow over a deep cavity at low subsonic velocity is considered in the present paper. The cavity length-to-depth aspect
ratio is L/H = 0.2. Single hot-wire measurements characterized the incident turbulent boundary layer and show the influence of the cavity
on the streamwise statistic components just downstream from the cavity. The streamwise mean and fluctuating velocity profiles
are affected by the cavity. PIV measurements reveal the presence for ejection-like events responsible of local perturbations
of the skewness and the flatness coefficients. Time-resolved PIV technic is also used to characterize phase properties of
shear layer oscillating cycle. It is shown that for deep cavity with first Rossiter mode, only one vortical structure is formed
at the cavity leading edge. Then, it grows while convecting downstream along the shear layer. A well-defined ejection process
begins after the vortex impact near the cavity downstream corner. A cylinder device placed spanwisely near the cavity leading
edge eliminates the resonance and highly modifies the behavior of the shear layer flow. In fact, the shear layer could be
divided into upper and lower parts with different structure aspects. |
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Keywords: | Deep cavity Cylinder control Time-resolved PIV |
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