撞击流反应器流场稳定性研究  

Study on the flow field stability of impinging stream reactor

作　　者：刘雪晴[1] 鲁录义[1] 

机构地区：[1]华中科技大学能源与动力学院,湖北武汉430074

出　　处：《现代机械》2017年第4期18-22,共5页Modern Machinery

基　　金：国家重点基础研究发展计划项目(2015CB251504)

摘　　要：采用数值模拟的方法研究对置喷嘴撞击流,分析了撞击流流场结构,创建了7种不同管径比的几何模型,分别为1/3、1/5、1/7、1/10、1/12、1/15、1/20,同时也考察了气流雷诺数对稳态和非稳态撞击流稳定性的影响。研究结果表明,撞击流的稳定性与撞击流的几何模型及入口雷诺数有关,撞击流流场可分为入口区,撞击区,出口区及漩涡区。对于非稳态工况下,在入口气流雷诺数一定情况下,管径比大于1/10的模型都能形成稳定的撞击流,管径比小于1/10的模型中撞击流形成一段时间后都会失效。当管径比一定时,随着雷诺数的增大,撞击流持续时间在减小,变化形式依据不同管径比而不同。The colliding nozzle flow is studied by numerical simulation,the geometry structure of impinging stream is analyzed and seven different geometrical models with different caliber ratio are created,which are 1/3,1/5,1/7,1/10,1/12,1/15,1/20. The effects of air flow Reynolds number on the stability of the steady and unsteady impinging stream are also investigated. The results show that the stability of impinging stream is related to the geometry of the impinging stream and the Reynolds number at the inlet. The impinging stream field can be divided into the inlet region,the impact region,the exit region and the vortex region. When the Reynolds number of inlet airflow is constant,the steady flow of impinging stream can be formed in the model with caliber ratio greater than 1/10 under unsteady condition. In the model with caliber ratio less than 1/10,the impinging stream will fail after a certain period of time. When the caliber ratio is constant,with the increase of the Reynolds number,the duration of the impinging stream is decreasing,and the forms of variation are different according to different caliber ratio.

关 键 词：撞击流 数值模拟 稳定性 

分 类 号：TM621[电气工程—电力系统及自动化]