供料位置对离心机供料射流流场影响的数值模拟  

Numerical Simulation of Influence of Feed Position on Flow Field

作　　者：张雯成 姜东君[1] 曾实[1] 

机构地区：[1]清华大学工程物理系,北京100084

出　　处：《原子能科学技术》2014年第2期331-335,共5页Atomic Energy Science and Technology

基　　金：国家自然科学基金资助项目(11075088);中俄(NSFC-RFBR)合作项目资助(11311120046)

摘　　要：为研究供料口位置对离心机供料射流流场的影响,采用直接模拟蒙特卡罗(DSMC)方法对离心机中心射流区域进行模拟。选择Iguassu离心机模型和变径硬球碰撞模型,得到了不同的轴向和径向供料位置下径向供料模型的供料射流流场参数分布情况。通过对模拟结果进行分析可得:在径向供料条件下,供料口附近区域的流场受供料条件的影响显著。由于供料射流的膨胀作用,导致了供料口附近低温区的出现。在靠近出流边界处,由于较高的角向速度,形成较大的压力梯度,使气体的径向速度降低,导致温度明显升高。轴向位置的变化导致流体参数的轴向平移。而随着供料口径向位置的增大,供料口附近的膨胀范围减小,低温区减弱,即该区域的最低温度升高。而近出流边界处,随供料口径向位置的增大,温度相应降低,径向速度同时降低。In order to study the influence of feed position on the counter-current in gas centrifuge ,direct simulation Monte-Carlo （DSMC） method was chosen to simulation the rarefied region of gas centrifuge .By setting Iguassu centrifuge model and variable hard sphere （VHS） model ,the flow distributions of different feed positions were acquired . The analysis of the calculation results notes the following flow phenomena ：In case of radial feed ,the region near the feed outlet is largely influenced by the feed condition . The expansion of jet results in the hypothermic region .Near the boundary of effluent , due to the fast peripheral velocity ,pressure gradient is large ,w hich results in the slow radial velocity and the high temperature .The axial translation of the jet results in the axial translation of the flow distributions .With the increase of the radius of feed ,the region of expansion near the feed reduces and the lowest temperature of the hypothermic region rises .Near the boundary of effluent ,with the increase of the radius of feed ,the temperature and the radial velocity fall .

关 键 词：气体离心机 稀薄流区 数值模拟 

分 类 号：TL25[核科学技术—核燃料循环与材料]