喷气涡流纺喷嘴模型——不等长同心圆管腔体内切向旋流流动特性的数值研究  

Numerical Study on the Tangentially Injected Swirling Flow in the Cavity Formed by Concentric Tubes of Different Lengths as a Model for the Vortex Spinning Nozzle

作　　者：孙磊磊[1] 裴泽光[1,2] 陈革[1,2] 李姝佳[1] 

机构地区：[1]东华大学机械工程学院,上海201620 [2]东华大学纺织装备教育部工程研究中心,上海201620

出　　处：《东华大学学报（自然科学版）》2014年第3期322-328,共7页Journal of Donghua University(Natural Science)

基　　金：国家自然科学基金资助项目(51076026;11302048);上海市自然科学基金(青年)资助项目(12ZR1440300);高等学校博士学科点专项科研基金资助项目(20130075120002);中央高校基本科研业务费专项资金资助项目

摘　　要：将喷气涡流纺喷嘴抽象为设有切向气流喷射孔的不等长同心圆管腔体模型,采用计算流体动力学方法,对不等长同心圆管腔体内以切向喷射方法产生的高速可压缩切向旋流的流动特性进行基础研究.研究表明:在切向喷射孔上游出现反旋涡对;切向喷射孔出口外侧气流流速超过音速,随后在外管与内管间的环形区域内以亚音速向下游旋转流动;切向喷射孔入口总压对喷射孔出口附近及其下游区域内气流速度影响不明显.本研究可为喷气涡流纺喷嘴的设计提供可借鉴的思路与结论.The vortex spinning nozzle is modeled as concentric tubes of different lengths with tangential injectors. The characteristics of high-speed compressible tangentially injected swirling flow inside the cavity formed by the concentric tubes are investigated using computational fluid dynamics. The results show that a counter-rotating vortex pair （CVP） is generated upstream of the injectors. The speed of airflow which exits in the vicinity of the injector exceeds the speed of sound. The air currents in the annular region between the outer and inner tubes whirls downstream in a spiral trajectory subsonically. The total pressure at the injector inlet has no significant influence on the airflow velocity in the vicinity of the injector outlet and downstream region. This research is expected to provide a reference for the design of the vortex spinning nozzle.

关 键 词：切向旋流 同心圆管 腔体 数值模拟 喷气涡流纺 

分 类 号：TB126[理学—工程力学]