The results show that NOx emission was abated when the nozzle with two circle air jet was converted into the nozzle with two rectangular air jet.
研究结果认为：在燃气喷口两侧布置两个矩形空气喷口的烧嘴，氮氧化物排放量低于圆形空气喷口烧嘴；
2
A new propulsion concept of 2 D C D vectoring nozzle was proposed, which had a convergent duct shaped by spheric surface and a divergent one with rectangular transverse section.