不同送排风方式下铀气溶胶扩散规律模拟研究

Simulation of Uranium Aerosol Diffusion Under Different Air Supply and Exhaust Modes

本研究基于CFD软件Fluent,开展上送下排、顶送下排、下送顶排、下送上排四种送排风方式下,厂房内铀气溶胶颗粒释放和扩散规律的研究。结果表明,不管哪种送排风方式,厂房内铀气溶胶颗粒的运动轨迹均受到气流组织的影响;顶送下排方式下,部分气溶胶颗粒未排出厂房外,其他送排风方式下,气溶胶颗粒均排出厂房外;下送上排方式下,厂房内污染物平均浓度最低,且排出气溶胶颗粒物的效率最高,其次是上送下排。对于下送上排方式,小粒径颗粒被“包裹”在气流中运动,大粒径颗粒在释放后的初始阶段受气流影响较为明显,但是随着时间推移,颗粒自身惯性力和重力起主要作用。

In this study,THE CFD software Fluent was used to study the release and diffusion rules of uranium aerosol particles in the plant under four air supply and exhaust modes:supply air up and exhaust air down,supply air top and exhaust air down,supply air down and exhaust air top,supply air down and exhaust air up.The results show that the trajectory of uranium aerosol particles in the workshop is affected by the air distribution regardless of the air supply and exhaust modes.In the mode of supply air top and exhaust air down,part of aerosol particles are not discharged out of the plant,while in the other mode of air supply and exhaust,aerosol particles are discharged out of the plant.The average concentration of pollutants in the plant is the lowest and the efficiency of discharging aerosol particles is the highest in the way of supply air down and exhaust air up,followed bysupply air up and exhaust air down.For the mode of supply air down and exhaust air up,small particles are“wrapped”in the flow,while large particles are obviously affected by the flow in the initial stage after release.However,as time goes by,the inertia force and gravity of particles play a major role.