气固两相撞击流内颗粒运动规律的实验研究  

Experimental Study of the Law Governing the Movement of Particles Inside a Gas-solid Two-phase Impingement Flow

作　　者：杜敏[1] 周宾[2] 

机构地区：[1]江苏大学能源与动力工程学院,江苏镇江212013 [2]东南大学空间科学与技术研究院,江苏南京210096

出　　处：《热能动力工程》2013年第6期611-615,661,共5页Journal of Engineering for Thermal Energy and Power

基　　金：国家自然科学基金资助项目(50976024);江苏省自然科学基金项目(BK20130520);江苏省高校自然科学研究面上项目(13KJB470002);江苏大学高级人才专项资助项目(11JDG152)

摘　　要：为研究气固两相撞击流内的颗粒运动规律,在自行设计的撞击流实验装置上以玻璃珠为颗粒物料,通过改变加料方式、喷嘴间距、气流速度、颗粒加料速率和颗粒粒径等条件,对撞击流内的颗粒撞击特性进行研究,得出了不同条件下的颗粒运动规律。研究表明,气固两相撞击流内两股颗粒在颗粒碰撞区发生剧烈撞击后向四周散开,没有明显的颗粒渗入反向流的现象,且颗粒碰撞区内的剧烈颗粒碰撞使得颗粒浓度升高;在其它条件一定的情况下,喷嘴间距的减小和颗粒加料速率的增大均使得颗粒碰撞区内的颗粒碰撞更加剧烈,颗粒碰撞区的范围变小变窄;颗粒粒径较大时,颗粒数密度的减小使得颗粒之间的碰撞相对减少。To study the movement law of particles inside a gas-solid two-phase impingement flow,investigated was the impingement characteristics of particles inside an impingement flow with glass balls serving as the particle materials on a self-designed impingement flow test rig by changing the material feeding mode,clearance between nozzles,gas flow speed,particle feeding speed and diameter etc. and the movement law of particles under different conditions were obtained. It has been found that inside a gas-solid two-phase flow,after a drastic impingement of two strands of particle flow has occurred in the particle impingement zone,the particles will disperse to everywhere and there will be no phenomena that any particle obviously joins in a reverse flow. Furthermore,the drastic impingement in the impingement zone will lead to a rise of the particle concentration. In the case that other conditions are kept constant,to decrease the clearance between the nozzles and increase the particle feeding speed will force the impingement inside the impingement zone more drastic,thus the particle impingement zone will become smaller and narrower. When the particle diameter is relatively big,to decrease the particle density will result in a decrease of the impingement correspondingly between particles.

关 键 词：撞击流 气固两相流 颗粒运动 碰撞 

分 类 号：O359[理学—流体力学]