Abstract
The effect of acoustically lined walls on cascade flutter is investigated theoretically using a semi-actuator disc model, which permits the considerations for flow turning and total pressure loss due to cascades. The three-dimensional flow fields, upstream, inside and downstream of the cascade are solved separately, and then combined to meet the boundary conditions at the leading edge plane and the training edge plane. The acoustic characteristics of walls in each region are specified by the uniform acoustic admittance. It is shown that an acoustically lined wall can stabilise as well as destabilise blade oscillation depending on its acoustic admittance.
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