机加工油雾颗粒散发模型与粒径分布规律

Model Study of Machining Aerosol Emission Rate and Particle Size Distribution

摘要:

引入气溶胶雾化率，结合理论模型得到最大雾化流量，由此计算出油雾颗粒散发率。利用Rosin?Rammler函数拟合粒径分布规律。采用一种环境舱的实验方法得到了气溶胶雾化系数和Rosin?Rammler函数的关键参数。建立了甩出机制下各个粒径油雾颗粒的散发率模型。实验数据表明,总的油雾颗粒散发率为14.58~620.95 mg?h-1，油雾颗粒散发率和气溶胶雾化系数随着刀具转速的增加而增加，其中气溶胶雾化系数与刀具转速呈线性关系，相关系数R2为0.998。本文的模型能预测的机加工过程中各粒径油雾颗粒的散发率，平均偏差为（3.69±12.7） mg?h-1。

Abstract:

This paper introduces an aerosol atomization factor to calculate the mass emission rate of oil particles using the maximum fluid flow rate for atomization obtained from a theoretical model. The particle size distribution is obtained by the Rosin-Rammler function. An environmental chamber is used to obtain the mass median diameter and the distribution coefficient of the Rosin-Rammler function, as well as the aerosol atomization factor. The particle emission rate is then modelled for each particle size.The experimental data show that the mass emission rate of oil particles ranges from 14.58 to 620.95 mg?h-1. Both the particle emission rate and the aerosol atomization factor increase with tool rotational velocity. Moreover, the aerosol atomization factor is a linear function of the tool rotational velocity, with a determination coefficient R2 of 0.998. The model established in this paper represents the oil particle emission rate accurately for each particle size, with an average error of 3.69±12.7 mg?h-1.