文氏管对旋流流场影响的数值研究

发布时间：2018-05-11 05:26

本文选题：流场 + 文氏管　；参考：《推进技术》2016年05期

【摘要】：为了研究文氏管对旋流流场的影响,将文氏管+套筒组合的旋流器,通过与无文氏管的旋流器、带内文氏管的旋流器和带外套筒的旋流器这三种结构的性能对比发现,文氏管不仅对旋转射流起到过渡作用,使速度场周向分布均匀,而且对射流速度大小起到一定的调节作用;文氏管的存在可以使流场局部湍动能增大,但因文氏管结构的差异会造成旋流强度不同程度的变化,引起回流区尺寸变化;文氏管+套筒组合的旋流器不仅能提供较强的旋流流场,使火焰筒内回流区面积较大,而且对燃烧室进气压力的调节范围也较广,一定范围内能保证流场结构的稳定;此外,套筒扩张角的增大能促进回流区的径向扩张,使回流区宽度增大;存在一个临界的内文氏管扩张角57°,使文氏管+套筒组合的旋流器流场回流区结构出现分离,形成两个独立的回流区。
[Abstract]:In order to study the effect of Venturi tube on the swirl flow field, the performance of the cyclone with Venturi tube sleeve is compared with that of the cyclone without Venturi tube, the cyclone with internal Venturi tube and the cyclone with outer sleeve. The Venturi tube not only plays a transitional role on the rotating jet, but also adjusts the velocity of the jet by uniform distribution of the circumferential direction of the velocity field, and the existence of the Venturi tube can increase the local turbulent kinetic energy of the flow field. However, the different structure of Venturi tube will cause the variation of swirl intensity and the change of the size of the reflux zone, and the combined cyclone of Venturi tube sleeve can not only provide a strong swirl flow field, but also make the area of the reflux zone in the flame tube larger. In addition, the increase of the expansion angle of the sleeve can promote the radial expansion of the backflow zone and increase the width of the reflux zone. There is a critical inner Venturi tube expansion angle of 57 掳, which separates the flow field structure of the Venturi tube sleeve and forms two independent reflux regions.
【作者单位】：浙江大学航空航天学院;
【基金】：国家自然科学基金(11372276,11432013)
【分类号】：TK473

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