Gas diffusion arrangement

摘要

A gas diffusion arrangement ( 22 ) for a gas turbine engine ( 10 ) is disclosed. The gas diffusion arrangement ( 22 ) has an inlet ( 26 ) and an outlet ( 28 ) for the gas, and comprises diffusion means ( 32 ) having an upstream region ( 38 ) and a downstream region ( 40 ). Distribution means ( 41 ) is arranged between the downstream region ( 40 ) and the outlet ( 28 ) to distribute the gas into a desired flow pattern. The area ratio of the cross-sectional area of the downstream region ( 40 ) to the cross-sectional area of the upstream region ( 38 ) is greater than 1.5 to 1.