中文摘要：

研究了通风小室内不同粒径气溶胶颗粒（0．3～0．5μm、0．5—1μm、1～2μm以及2～5μm）的沉积率在6种典型室内换气次数（6．51h^-1、7．81h^-1、9．11h^-1、10．42h^-1、11．72h^-1以及13．02h^-1）下的变化情况。采用安装Laskin喷嘴的QRJ-1型气溶胶发生器产生气溶胶颗粒，使用BCJ-1D型激光尘埃粒子计数器测量室内一点的气溶胶颗粒浓度变化。结果表明，在上述6种换气次数下，气溶胶浓度的衰减均与时间近似呈对数关系。相同换气次数下，气溶胶颗粒的沉积率随着粒径的增加而增加；对于同一粒径颗粒，气溶胶的沉积率随着换气次数的增加而增加。换气次数在9．11h^-1以下时，增加换气次数对颗粒沉积率的影响显著；换气次数在9．11h^-1以上时，增加换气次数对颗粒沉积率的影响较小。在较小的换气次数下，颗粒沉积率的增加快于换气次数的增加；而在较大的换气次数下，增加换气次数时，颗粒沉积率的增加速度与换气次数基本一致，而颗粒被排风带走的比例较稳定。

英文摘要：

The paper is to introduce the research results of its experimental study on the relation between the bio-aerosol panicle deposition rates and air change rate per hour （ACH） in a scaled chamber under mixed ventilation （MV） strategy. The particles were classified into four groups by size ： 0.3 - 0.5 μm, 0.5 - 1 /μm, 1 - 2 /μm and 2-5 /μm. The ACH used in this study were 6.51 h^-1, 7.81 h^-1, 9.11 h^-1, 10.42 h^-1 , 11.72 h^-1 and 13.02 h^-1, all of which were among the typical range in real MV applications. In proceeding with our experiments, we adopted a QRJ- 1 aerosol generator with Laskin atomizer to introduce particles into the chamber. In addition, we have used a laser particle counter （BCJ- 1D） to measure the particle concentration at a predetermined point inside the chamber. It was found that the particle concentration decay follows a natural logarithm relation with time for all the ACH studied in this paper. At a certain ACH, particle deposition rates tend to increase with the increase of the particle diameter, and particles in our study were among the accumulation and coarse mode. For a certain particle size, the increasing ACH can naturally cause the augment of the particle deposition rate because it would enhance the intensity of turbulence near the wails. Thus, the increase of ACH has a stronger impact on the particle deposition rate in the condition with an ACH lower than 9.11 h^- 1 than higher than 9.11 h^-1. The particle deposition rates would increase faster than ACH if it is lower than ACH 9.11 h^-1. Growing rates of particle deposition rates and ACH tend to be the same when ACH was above 9.11 h^-1. In this situation, the ratios of particle would lose due to the ventilation for different particle sizes become stable. Thus, it can be seen that this paper is a worthy contribution to the deeper understanding of the particle decay behaviors in a real mixed ventilated laboratory rooms.