【作者】 吴俊禄； 张子涵； 郭子学； 姜东君；

【Author】 WU Junlu;ZHANG Zihan;GUO Zixue;JIANG Dongjun;Department of Engineering Physics,Tsinghua University;Science and Technology on Particle Transport and Separation Laboratory;

【机构】 清华大学工程物理系； 粒子输运与富集技术全国重点实验室；

【摘要】 气体离心机在正常运转时,超高声速气流会在取料支臂口部形成一道强激波,同时产生高温。这种高温会导致部分热稳定性较差的工质发生热分解,影响机器正常运转,甚至堵塞取料支臂。为解决部分工质在取料支臂口部的热分解问题,本文提出了一种在离心机中混入辅助气体的方法。辅助气体具有比工质更高的声速,因此,在机器转速不变的前提下,混合气体有更低的马赫数,激波的强度削弱,温度降低,进而降低了热分解速率。本文使用轴对称等径取料支臂的模型、以四（三氟膦）镍[Ni（PF₃）₄]为分离工质进行了模拟验证,并使用了SST k-ω湍流模型,同时进行流场与取料支臂的流固热耦合计算。通过在Ni（PF₃）₄中混入不同体积分数的PF₃,得到以下的结果:随着混入PF₃体积分数的增加,取料流量增大,流体最高温度逐渐降低,相对分解速率也明显降低,但是体积分数达到50%时,取料支臂的水力学状态也发生了改变。因此,应综合考虑取料支臂的水力学状态和工质热分解程度,严格控制辅助气体的体积分数,能一定程度上缓解取料支臂口部的工质热分解问题。更多还原

【Abstract】 In order to solve the problem of thermal decomposition of part of the processing gas at the mouth of the scoop,a method of mixing the gas of the decomposition product of the processing gas into the centrifuge is proposed.By mixing the decomposition product gas,the Mach number of the gas stream can be reduced,the temperature can be lowered,and the thermal decomposition rate can be reduced.In this paper,the axisymmetric equal-diameter scoop model is used to simulate and verify the separation of tetra（trifluorophosphine） nickel（Ni（PF₃）₄）.By mixing PF₃ with different volume fractions in Ni（PF₃）₄,the following results are obtained:with the increase of mixed PF₃ volume fraction,the reclaiming flow rate increases,the maximum temperature of the fluid gradually decreases,and the relative decomposition rate also decreases significantly,but when the volume fraction reaches 50%,the hydraulic state of the scoop also changes.Therefore,the hydraulic state of the scoop and the degree of thermal decomposition of the working substance should be comprehensively considered,and the volume fraction of the auxiliary gas should be strictly controlled,which can alleviate the problem of thermal decomposition of the working substance at the mouth of the scoop to a certain extent.更多还原