Prediction of fluid instabilities in hole-pattern stator seals
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This paper presents the results of the numerical simulation of the flow/acoustic interaction in cavities located within a channel. The numerical simulations were compared against the experimental data obtained on a hole-pattern seal. The nu- merical simulation used a Reynolds-averaged Navier-Stokes solver. The numerical algorithm consisted of an unstructured flow solver developed for the computation of hybrid, structured and unstructured grids. The salient features of the flow/acoustic interaction seemed to be properly captured by the numerical simulation. The flow simulation reproduced the interaction between the vortices shed at the leading edge of the cavity, the shear layer developed over the cavity, and the acoustic waves gen- erated by a dipole located at the trailing edge of the cavity. The flow conditions used for the study duplicated test conditions in experiments at a Mach number of 0.2. The length and depth of the cavity was 3.175 mm, and the seal clearance was 0.7112 mm. The Reynolds number based on the cavity length was 14,300. The dominant frequency predicted by the simulation was 15,770 Hz while the dominant frequency from the experiment was 15,625 Hz. Copyright © 2009 by the American Institute of Aeronautics and Astronautics, Inc.
author list (cited authors)
Liliedahl, D., & Cizmas, P.