| 摘要 |
<p>A combustion chamber 15 has an annular wall 40 with two rows of dilution apertures 58, 60 spaced apart axially. In each row, dilution apertures are circumferentially spaced, and each aperture has a polygonal cross-sectional shape, e.g. a triangle. Apertures in adjacent rows are staggered circumferentially, and a corner 62A of each dilution aperture in one row is axially upstream of a corner 64A of each dilution aperture in the adjacent row. The axial distance taken up by the two rows of dilution apertures in the annular wall is reduced compared to the use of two rows of circular dilution apertures and enables a greater mass flow of dilution air through a shorter axial distance giving better quenching of the rich burn combustion process and a reduction in nitrous oxide emissions.</p> |
