喷嘴旋向对多喷嘴预混燃烧的影响

发布时间：2018-01-11 18:21

本文关键词：喷嘴旋向对多喷嘴预混燃烧的影响　出处：《燃烧科学与技术》2016年04期 　论文类型：期刊论文

【摘要】：针对五喷嘴模型燃烧室采用层流小火焰模型进行数值模拟,讨论了中心喷嘴同向旋流和反向旋流对甲烷/空气多喷嘴预混燃烧的影响,模拟结果与实验结果吻合较好.数值模拟结果表明,多喷嘴预混火焰悬浮于喷嘴上方0.3,d处,多喷嘴气流相互掺混形成了高度湍流的掺混区,在掺混区内发生强烈的燃烧化学反应.中心喷嘴同向旋流布置时,主回流区顺时针扭曲,流动最后发展为与单喷嘴类似的旋流流场结构;对于中心喷嘴反向布置,气流整体旋流偏转较小,掺混后喷嘴气流仍然保持着各自的旋流流动结构.此外,中心喷嘴的同向/反向布置对多喷嘴预混燃烧反应进程的影响不大.
[Abstract]:A laminar small flame model was used to simulate the combustion chamber with five nozzles. The effects of the coaxial swirl and reverse swirl of the central nozzle on the methane / air multi-nozzle premixed combustion were discussed. The numerical simulation results show that the multi-nozzle premixed flame suspends at 0.3d above the nozzle, and the multi-nozzle airflow blends with each other to form a highly turbulent mixing zone. A strong combustion chemical reaction occurs in the mixing zone. When the central nozzle is arranged in the same direction, the main return zone is twisted clockwise, and the flow finally develops into a swirl flow field structure similar to that of a single nozzle. For the reverse arrangement of the central nozzle, the overall swirl deflection of the air flow is small, and after mixing, the nozzle airflow still maintains its own swirl flow structure. The codirectional / reverse arrangement of central nozzles has little effect on the reaction process of multi-nozzle premixed combustion.
【作者单位】：上海交通大学机械与动力工程学院;
【基金】：国家自然科学基金资助项目(51206109)
【分类号】：TK471
【正文快照】： 现代燃气轮机燃烧室通常采用环形或管形布置的多喷嘴燃烧器结构.多喷嘴燃烧器既可以增加燃烧室的热负荷及负荷调节比,又可以确保一个喷嘴熄火时邻近的喷嘴能够将它重新点燃.除此之外,多喷嘴燃烧系统在抑制噪声和热声振荡方面具有优越的性能[1].多喷嘴燃烧器内由于喷嘴气流的相

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