本课题利用普遍使用于HVAC行业的k-ε两方程模型进行计算仿真，并结合现场实测，对上海某一汽车制造厂车身车间局部区域中的通风气流组织进行了研究，以车身车间处理电焊烟尘的通风系统为研究对象，论证了工程中采用的气流组织的可行性状况，验证了针对这一工程实际所建立的数学模型的正确性。并在此基础上对气流组织进行了优化，提出了上部两侧送风中间上部回风的气流组织形式最佳的送风角度，及在大空间区域内进行局部通风时周围围挡设施对通风效果的影响状况。得到以下的主要结论：

1、 上部两侧送风中间上部回风的气流组织形式中送风角度宜在与竖直面成40～44度间。

2、 在高大空间内部无横向气流干扰情况下进行局部通风时，设不设围挡设施，对气流流场影响不大。

高大的空间环境中采用中央空调调节室内空气环境的情况下，局部区域内空气为生状况差的显现，在实际中很常见，对这些局部区域的通风气流组织形式进行研究，能对类似的通风改造提供借鉴或指导。

Based on the theoretically analysis of physical and mathematical model, the k- ε two-equation turbulence model is adopted to simulate the two-dimensional air distribution of air conditioned-space and the wall function is used for the boundary condition. The reliability and rationality of this simulation are analyzed and compared with different illustration. From the analysis and comparing, it proves that the k- εturbulence model and the boundary condition treatment used in this paper are correct and reliable for the distribution of non-isothermal air-conditioned space.

According to Chinese industry standard ( JBJ10-96 ), the form of ventilation and dust removal in workshop which has changeable dust source is general ventilation. As far as the large workshop with changeable dust is concerned, the general ventilation is expensive, depletive, and, at the same time, can't meet the request of environmental protection. and to deal with harmful substance in workshop with stratification and partitioned space allocation.

This paper adopt the k - e model of standard turbulence, apply staggered grid and finite volume approach discrete equation analysis. At last, the paper get the optimum result on the basis of economy and practicality, offer the reference for the most optimum of complex air distribution in large space, Moreover, in connection with evaluation air distribution of ventilation and dust removal, this paper comes up with the concept of Dust Age, so that it can evaluate the result of simulation better, and give the new evaluation index.