Abstract: The effect of small tabs on jet mixing enhancement for a convergent axisymmetric nozzle under subsonic flow( Ma= 0 35) was tested. The number of pieces, the inclined angle and the block ratio of the tabs were investigated. The results show that small tabs can greatly improve jet mixing, distort downstream flowfield, quicken the decay of potential core flow(the length of potential core drops from 5 D down to 1 5D ) , and increase the entrainment dramatically (up to 2 7 times) +

Key words: Small tabs +;Jet nozzle;Jet mixing flow;Mixing enhancement

摘要： 测试了亚声速 （Ｍａ＝ ０．３５） 下小突片 （Ｔａｂｓ） 对轴对称收缩喷管射流的强化混合效果， 并探讨了小突片安装个数、后倾角度、堵塞比等因素对强化混合作用的影响。结果表明， 小突片对喷管射流的混合具有显著的强化作用， 不仅使下游流场发生显著变形， 使核心流的衰减显著加快（核心流长度从５Ｄ 降至大约１．５Ｄ）， 还使引射系数显著增加（本文中最大增加到２．７ 倍）。

关键词: 小突片;射流喷管;喷射混合流;强化混合