Annular reverse flow zone can be found too in the combustor with the flat-straight slag baffle.
简单环形挡渣板也能产生环形回流区，在旋风燃烧室设计中可取代锥形缩口挡渣板。
2
The transverse resolution of two zone leaky annular pupil filter increases with the central transmissivity decreasing, and in common cases axial resol.
The results indicate that flat-top beam shaping and single-circle beam shaping at the focal plane can all be realized by using three-zoneannular phase pupil filters.