| 摘要 |
This invention concerns a diffuser (50, 80, 100). The diffuser (50, 80, 100) includes an inlet (52, 82, 102), an outlet (54, 84, 104) and a diverging flow channel located between the inlet and outlet. The channel has a side wall (66.1, 66.2, 86.1, 86.2, 106) of which at least a portion diverges at a divergence angle (Θ). A bank (68 94, 114) of elements (70, 96, 116) is located at least partially inside the flow channel so that the elements are in the fluid flow path between the inlet (52, 82, 102) and outlet (54, 84, 104). In the preferred embodiment the elements are arranged such that they are staggered in the nominal stream-wise direction 72 but are linearly aligned along the diverging portion of the side wall (66.1, 66.2, 86.1, 86.2, 106) of the flow channel. The fluid momentum along the boundary wall is, in use, increased as a result of the aligned elements (70, 96, 116) along the side wall (66.1, 66.2, 86.1, 86.2, 106) of the channel and a static pressure drop is, in use, induced through the dispersion of fluid by the staggered elements in the stream-wise direction. The diffuser (50, 80, 100) reduces boundary layer separation to achieve substantially uniform flow velocity at an outlet (54, 84, 104) of the diffuser. |
